Pdf native android app jobs

I'm in need of a skilled Photoshop designer who can handle a variety of tasks while working primarily with PDF files. The project involves: - Photo retouching - Image editing - Graphic design Objectively, your task will be focused on editing a PDF file. The ideal candidate should have: - Extensive experience in Photoshop and PDF file manipulation. - Proven skills in photo retouching, image editing, and graphic design. - The ability to work punctually and meet deadlines. In your proposal, please share a brief summary of your experience and include examples of your previous Photoshop work focused on PDF editing.

I'm in need of reliable individuals who can record high quality short videos on their phones Key Requiremen...videos. - Video Length: The videos must be just 30 to 40 seconds long. Your Role: Your main responsibility will be to record short videos on your phone base on a question prompt. Questions would be provided and you would need to choose a question to answer in the video you are to record Ideal Skills & Experience: - Ability to record a clear video on your phone. - Ability to speak clearly in your native language and/or English. - Ability to work independently without anyone additional supervision. - Attention to detail and ability to follow specific guidelines. - Strong communication and organizational skills. I'd love to hear from you. Your efforts will be...

I am in need of regular people who are not camera shy and can record videos of 30 to 40 seconds speaking English and their Native language using their mobile phones. Requirements: - Video Recording: High quality videos are needed with a format of 4K or UHD at 60fps. - Primary Use: The recorded videos will be utilized for AI dataset creation, not for surveillance or content creation. Ideal Freelancer: - Anyone that can speak clearly in his native language and English. - Both Professionals and Newbies are eligible. - Worldwide Opportunity. I will provide guidance and answer any questions one may have.

I'm in need of an experienced Android developer to work on an existing app that targets the general public. The project involves a mix of UI/UX improvements, bug fixes, and the addition of new features. Key responsibilities include: - Enhancing the app's overall user experience through UI/UX improvements. - Addressing any existing bugs and issues in the application. - Implementing new features, primarily push notifications. Given the extensive nature of these changes, I'm looking for a professional with a proven record in Android app development. You should have experience with UI/UX, bug fixing, and adding new features in Android applications. Your expertise in push notifications is particularly important for this project. Previous wor...

I'm in need of an experienced Android developer to create a custom app. The primary goal of this app is to enable remote control of a computer. When using the app, the user should be able to: - Establish a secure and reliable connection between the Android device and a PC. - Control the PC remotely from the app. -connect with a PC on-site and provide live graphs,updates etc in the mobile application The ideal candidate would have experience in: - Android app development - Creating apps for remote control - Implementing secure communication protocols Please include any relevant projects you've worked on in your proposal.

I'm in need of a seasoned developer who is proficient in building mobile apps for both iOS and Android. The app will need to have basic functionalities including search, listing, adding, and removing items. It should also support user authentication, with a preference for social media logins. Key Requirements: - Develop a mobile app that works seamlessly on both iOS and Android platforms. - Implement basic functionalities like search, list, add, and remove within the app. - Set up a Node.js backend to support the app's functionality. - User authentication should be done through social media login. Bidding beyond the budget is strictly not allowed

I'm in need of unique and creative apparel designs fo...abilities and originality. - Understanding of current fashion trends, particularly athletic aesthetics. - A strong portfolio showcasing previous work in similar projects. - Knowledge about branding principles and marketing strategies to ensure designs are coherent with our brand's image and goals. 3. Requirements: - Deliver designs in a format ready to be sent to printer (AI, EPS, PDF, or PSD) - Include color scheme and recommended fabric material. I'm looking for a freelancer who understands the vision of our brand and can bring our ideas to life on clothing. We are a start up brand, and are excited to see your ideas! Attached is the Hoop Nation logo, along with our first shorts sampl...

I am looking for an experienced mobile app developer who can create a mobile e-commerce application for both iOS and Android platforms. The primary goal of this app is to provide a seamless shopping experience for users who watch videos on the platform. Key Features: - The app should offer both product selling and video streaming functionalities. - The product selling section should include a robust product search feature. This is crucial for helping users find and purchase products they discover while watching videos. Ideal Skills: - Proficiency in mobile app development for both iOS and Android. - Previous experience in developing e-commerce apps, especially those with integrated video streaming capabilities. - Strong understanding of UI/UX de...

I'm seeking an experienced app developer for creating a dynamic entertainment application compatible with both iOS and Android platforms. This app exclusively requires a feature for posting and commenting, providing users an interactive platform. Ideal Skills: - Strong experience in mobile app development for both platforms (iOS and Android) - Experience in developing entertainment applications - A thorough understanding and implementation of clean, efficient code - Must have a knack for intuitive UI/UX design Responsibilities: - From developing to post-launch support, handling end-to-end product lifecycle - Actively incorporate the 'post and comment' feature - Regular updates and bug fixes post launching Looking forward to collaboratin...

Project Description: Bicycle Manual Layout Enhancement Overview: The project entails refining the layout and formatting of a 16-page...to deliver a polished and professional final product. 4. Maintain compatibility: Preserve compatibility with Adobe InDesign CS6 to facilitate future updates and revisions, ensuring the longevity and usability of the manual. Deliverables: 1. Revised InDesign files: Supply the updated manual in Adobe InDesign CS6 format, allowing for easy access and modification in the future. 2. PDF version: Provide a high-quality PDF version of the manual for distribution and printing purposes, adhering to industry standards and specifications. Timeline: The project is expected to be completed within one week, allowing for thorough review and feedback befor...

I'm looking for an experienced Flutter developer who can help me build a cross-platform mobile application for both Android and iOS. The ideal candidate should have a strong understanding of UI/UX design and be comfortable with integrating backend services. The primary responsibilities for this project include: - Developing a mobile application for Android and iOS using Flutter - Ensuring the app has a user-friendly and aesthetically pleasing design - Implementing backend services as needed The ideal freelancer for this project should have: - Proven experience in developing cross-platform mobile applications with Flutter - A strong understanding of UI/UX design principles - Experience with integrating backend services into mobile applications If you have a port...

I'm looking to hire a skilled mobile app developer who can create an engaging business app compatible with both iOS and Android platforms. The crux of the project will include: -Key Features: The app should incorporate key business features such as a shopping cart functionality for smooth transactions, as well as user registration to allow for personalized experiences. -Ideal Skills: A successful candidate will be experienced in cross-platform development, preferably using Flutter or React Native. A working understanding of eCommerce systems and user data management are also integral for this role. Prior experience of working on similar apps with the said features will be a big plus. By successfully delivering on these requirements, you'll ...

I'm looking for a mobile app developer who can create a hybrid mobile application compatible with both iOS and Android. Key Requirements: I am looking for an experienced mobile app developer to bring my project from inception till successful deployment at AppStore. Here's what I need: - Develop a mobile app for both iOS and Android, demonstrating technical expertise across both platforms. - The type of app is not specified yet, it could be stock market, educational, IPO allotment app, lifestyle, or something else. Open to discussing ideas with you. - Ideal skills and experience: - Proficient in cross-platform mobile app development. - Excellent programming skills for both iOS and Android. - Innovative an...

I'm looking for a developer to create a Caller ID app for both Android and iOS platforms using MySQL database. The app should have the following features: - Comprehensive Caller Identification: The app should be able to identify incoming calls and display the caller's information if available. - Anti-Spam: The app should have a feature that can help block spam calls. When a call comes in, you will check that call through the API It will give you a response with his phone number, name, photo, and address You will display that information 1. Login first app. (SERVER URL, USERNAME, PASSWORD) 2. I just need the information of the person who gave the phone from my database to show his name, photo, and add...

I'm requiring a data scrapping software quickly to extract text content from both websites and PDF documents. It's crucial that the scraped data is directed into Excel or Google Sheets format for my immediate use. Ideal skills for this job would be: - Proficiency in programming languages like Python that are often used for data scrapping. - Familiarity with web scraping libraries or frameworks, e.g., Beautiful Soup or Scrapy. - Experience using APIs to scrape data if necessary. - Previous work in pulling data from PDFs into readable formats in Excel or Google Sheet. - Ability to deliver the project ASAP. Your attention to these requirements will be much appreciated as I need this task done urgently. Please contact me if you need more detail about the project, and I look...

I'm seeking an experienced app creator to develop an Android application focused on vehicle rentals. Key Features: - Intuitive and user-friendly interface for easy browsing and booking of available vehicles - Secure payment gateway integration for seamless transactions - Geolocation feature to locate rental points - Push notifications for updates, offers, and booking confirmations The app is primarily focused on cars. Prior experience in developing rental apps and robust knowledge of Android app development is preferred. A keen eye for user experience and a knack for creating visually appealing interfaces is also very important. Looking forward to your proposals.

I need a skilled Android developer to create an app using WebView. - The app should be compatible with Android 5.0 (Lollipop) and above. - It should primarily feature a WebView. - The development process should ensure smooth functioning and optimal user experience.

Russian Recording Project We have a project, that needs Native Russian speakers, we will give you the text, and you need to record 761 sentences. you just need to download our software, to read our text and record it, it's a very easy job. 1. You will need to record in a quiet place without loud background noise. and without echo. 2. Each person is $20 dollar for 761 sentences record. If you are interested please let me know sure.I will contact u. A Good Opportunity For New Freelancers For taking 5 Star Review after their completion of the project. Thanks :

German Recording project We have a project, that needs Native German speakers, we will give you the text, and you need to record 89 short sentences. you just need to download our software, to read our text and record it, it's a very easy job. 1. You will need to record in a quiet place without loud background noise. and without an echo. 2. Each person Price is 8$ for 89 short sentences record. 4. The project will take about 10-15 mins only. If you are interested please let me know sure. I will contact u. A Good Opportunity For New Freelancers For taking 5 Star Review after their completion of the project. Thanks :

France French Recording Project We have a project, that needs Native France French speakers, we will give you the text, and you need to record 89 short sentences. you just need to download our software, to read our text and record it, it's a very easy job. 1. You will need to record in a quiet place without loud background noise. and without an echo. 2. Each person Price is 5$ for 89 short sentences record. 4. The project will take about 10-15 mins only. If you are interested please let me know sure. I will contact u. A Good Opportunity For New Freelancers For taking 5 Star Review after their completion of the project. Thanks :

Turkish Recording Project We have a project, that needs Native Turkish speakers, we will give you the text, and you need to record 110 short sentences. you just need to open the platform link, to read our text and record it, it's a very easy job. 1. You will need to record in a quiet place without loud background noise. and without an echo. 2. Each person Price is 4$ for 110 short sentences record. 3. Payment after received feedback, It will take time 1-2 weeks. If you are interested please let me know sure. I will contact u. A Good Opportunity For New Freelancers For taking 5 Star Review after their completion of the project. Thanks :

Italian Recording Project We have a project, that needs Native Italian speakers, we will give you the text, and you need to record 89 short sentences. you just need to download our software, to read our text and record it, it's a very easy job. 1. You will need to record in a quiet place without loud background noise. and without an echo. 2. Each person Price is 5$ for 89 short sentences record. 4. The project will take about 10-15 mins only. If you are interested please let me know sure. I will contact u. A Good Opportunity For New Freelancers For taking 5 Star Review after their completion of the project. Thanks :

I'm seeking a skilled PDF editor focusing predominantly on text editing. Ideally, the editor should allow for seamless manipulation of text within the document. Below are the particular requirements: - Text Editing: This is the primary task. Users should be able to add, remove, or modify existing text with ease. This project requires immediate attention, and experience in editing would be beneficial. Please ensure you can commit to a swift completion before bidding.

...need a highly efficient app for this noble cause. As an app developer, you'll be instrumental in building a platform that is available across all internet and phone services because we're targeting both Android and iOS users. Key Skills And Experience: - Proven experience in app development across both iOS and Android platforms - Understanding and respect for client confidentiality - Excellent communication and user experience design skills Tasks Involved: 1. Drafting an intuitive and user-friendly application design 2. Integration of a payment system, preferably guided by your suggestion 3. Testing and fixing any troubleshooting issues The ideal freelancer should be able to suggest the best method for integrating a secure payment ...

I have an Android application that I'd like to enhance with a review feature. - The reviews should be submitted on a third-party platform linked from the app. - Ideally, I'd like to incorporate some form of user authentication before reviews are accepted. I'm open to suggestions on how to best handle the authentication process. The overall goal is to encourage genuine and constructive feedback while preventing spam or irrelevant reviews. I'm looking for a developer with experience in Android app development and implementing user engagement features. It's important that the final solution is user-friendly, secure, and seamlessly integrated with the existing app. Your ability to propose and implement a secure and user-friendl...

As a client, I am in search of a proficient software developer who can assist me in setting up a web application. Here are a few skills and experiences the ideal candidate must possess: - Mastery in web application building, with a good understanding of the available tools and technologies. - A track record in developing and lau...payment method, and sale date. 10. Feature for Tracking Purchases: Differentiate between cash and loan payments. Specify loan provider and amount. Calculate split payments. Reporting and analysis for payment methods and loan balances. Option to record and automatically deduct loan payments by manually adding the loan payed Additionally, I want daily sale details and inventory stock in printable PDF formats, for an estimation, there can be 20k+ stock item...

I am looking for male and female US-American voiceover artists. My project requires a professional tone of speech to effectively deliver the content. Key Requirements: - Must be a native US English speaker - Have experience in voiceover work for adult or intermediate e-learning - Ability to deliver a professional tone The ideal candidate for this project should be experienced in educational voice performance and should be able to skillfully tackle complex subjects with simplicity and clarity. Responsiveness, reliability and consistency are highly valued in this project. Please include samples of previous related work in your bid.

I am on the hunt for a skilled mobile app developer to bring my project to life. Here's what I need: - Develop a mobile app for both iOS and Android, demonstrating technical expertise across both platforms. - The type of app is not specified yet, it could be E-commerce, Educational, Lifestyle, or something else. Open to discussing ideas with you. Ideal skills and experience: - Proficient in cross-platform mobile app development. - Excellent programming skills for both iOS and Android. - Innovative and creative in ideating app concepts.

As the client for this project, I'm seeking a skilled React Native developer to construct a cross-platform application for both iOS and Android. Key Requirements: - Skillful in React Native development that targets both iOS and Android platforms. - Preference will be given to those who showcase an understanding of minimalistic design. The app needs to be visually appealing yet simple and uncluttered. - The app will require specific features such as Push Notifications and Geolocation. Proficiency in integrating these functionalities is essential. Ideal candidates will have experience in similar projects and show a capacity to deliver on the important aspects of this job. They must communicate well and meet deadlines consistently. Please, pr...

Description: We are looking for a skilled WordPress integrator to convert our web designs into a pixel-perfect, high-performance, SEO-friendly bilingual website with a mobile-first approach. The project scope includes integrating 24 pages across both desktop and mobile versions (48 page designs total). The ideal candidate will have a proven track record of integrating responsive designs into ...you are a detail-oriented WordPress integrator with experience in turning multiple page designs into high-performance, mobile-optimized websites that delight both users and search engines, we want to hear from you. Please share examples of similar integration projects you've worked on, especially mobile-first or SEO-optimized sites with 20+ pages. Attached: SEO technical specification docume...

...ACCEPT. I would like to pay $500 (INR 40,000) for developing a mobile app end to end. Wireframe, UI/UX (MATERIAL UI) frontend backend database and anything that I am missing here till hosting it on google and apple. I need a running app, and pre uploaded 10k users. I need a basic satsang + spiritual Matrimoney platform for Android and apple. One the first page their should be 2 options, 1: satsang and 2: Matrimony If you click on satsang, you can see all the Satsang happening near you and can also post Satsang If you click on matrimoney you can see guys and girls who want to get married Please share the link of the work before I assign it to you. Home Page: On the Home page, we have footer navigation for the Mobile App as mentioned below: • Home...

I need an experienced Native Android app and SDK developer to work on an existing wellness app. The main focus should be on health tracking, specifically heart rate monitoring. You should have prior experience developing similar health or fitness apps and be familiar with heart rate monitoring technology. Bonus points if you can provide examples of previous work in this field. Key skills required are Android development, SDK, Android Library creation, Java, Kotlin and health app design and development best practices.

...Subject -X522 I'm looking for a proficient Android app developer with experience working with Bluetooth Low Energy (BLE) devices and data syncing to an API. Your task will primarily involve: - Developing a Raqmiyat-based Android application using the provided BLE devices. - Utilizing data collected from these devices, which will include location data, temperature, and heart rate information. - Syncing the collected data with a predetermined API. - Generating PDF reports based on this data. - Implementing functionality to produce alerts when a BLE device goes out of range. For this role, comprehensive understanding and experience in Android app development, BLE devices, data synchronization and API interfacing is essential. Familiarity ...

I'm looking for an experienced Android app developer to create an application that can streamline our business operations. The primary aim of this app is to aid in our internal Packing Management process. Essential features to be incorporated include: - Scanning Barcodes for Tracking: This feature should be designed in a user-friendly manner supporting ease of access and efficient operations. - Generating Shipping Labels: The application should also be capable of instantly generating shipping labels, saving us significant preparation time. The ideal candidate will have in-depth knowledge and experience in Android app development, particularly with inventory and packing management features. You should be able to effectively integrate barcode ...

Please DONT APPLY of you dont have the experience and skills! I'm looking for an NLP Developer who has experience with parsing PDF files, integrating OpenAI and other LLM providers APIs, and building RAG (Retrieval-Augmented Generation) applications. The main objective of this project is to build a chatbot based on a repository of documents. Key Responsibilities: - Implementing PDF parsing capabilities to extract textual data for processing - Integrating OpenAI APIs to enhance the chatbot's responses - Building a RAG-based chatbot system for providing contextual answers The ideal candidate should have: - Proficiency in NLP and experience with developing language models - Strong skills in integrating APIs - Previous experience in building chatbots or conversational...

I'm looking for a Python programmer who can create custom code to extract text, numerical data and dates from an Excel spreadsheet and populate PDF fields using the PDFMiner library. You should be confident writing Python scripts and have experience manipulating Excel and PDF files. Familiarity with PDFMiner is a essential. - Must Haves: - Proven Python programming experience. - Familiarity with the PDFMiner library. - Ability to extract and manipulate data from Excel. - Experience in PDF field population.

I'm seeking an experienced AutoCAD draftsperson to convert 1-5 pages of PDF building plans into a detailed DWG source file. The aim is to create editable CAD files for future revisions and modifications. Key Requirements: - Convert 1-5 pages of PDF building plans into a detailed DWG source file - Deliver a CAD file with detailed interior and exterior features: doors, windows, furniture, etc. - Ensure that the CAD files are accurately drawn and scalable for future modifications Ideal Skills: - Proficiency in AutoCAD - Previous experience in converting PDFs into DWG files - Strong attention to detail and accuracy in CAD work - Knowledge of architectural drawings and building plans Please note that the focus here is on creating the CAD file for future revisions, rather...

I am looking for a voiceover artist to read a text message aloud in a casual tone. The accent should be like subtly Slovak, not too strong and the recording should take less than a minute. The purpose is not for a greeting message, a video, or a phone system prompt, simply for reading a written text. The ideal candidate will have: Key requirements: - Casual English accent - Previous experience with voiceovers - Able to provide a sample of your work - Comfortable with a flexible project scope (length and tone) If you are okay then submit your voice sample with your proposal.

I need a React Native expert to help design and implement a light and dark mode for an iOS app. The details of the current version of React Native being used, whether the mode should be automatically detected, and if the modes will have different layouts or color schemes, have not been specified. Ideal Skills: - Proficiency in React Native - Experience with iOS app development - Knowledge of light and dark mode functionality Your responsibilities include: - Designing a user-friendly light and dark mode - Implementing the design into the app - Testing for functionality and UX issues I hope to collaborate with a developer who can provide creative solutions and is open to discussion. Open, regular communication regarding project updates is vital. ...

I am looking for an experienced Android developer to address some issues and upgrade two of our existing Android applications. The fixes should include: - Fixing data-fetching issues in 2-3 forms that aren't retrieving data as intended - Resolving a problem where an application form keeps loading without progress - Rectifying a form submission issue that only displays a 'Try Again' message after submission The primary areas of these bugs are related to data synchronization and form submission. Ideal candidates should have: - Proven experience in Android application development and bug fixing - Proficiency in diagnosing and resolving data synchronization issues - Expertise in Android 14 and Google Play Console, with a track record of successfu...

I'm looking for a skilled Android developer to create an Android application from the software available at the following GitHub link: // Key project requirements: - The Android app should include all the functions and methods currently present in the GitHub software. - The application must be responsive, adapting to different mobile screen sizes seamlessly. - The project need to be completed within 2 days. Ideal candidate: An ideal candidate would be an experienced Android developer who has a thorough understanding of GitHub software implementation and has experience in fast-paced development environments. Critical skills required includes: - Experienced in app development - Knowledge of GitHub software integration - Skill in developin...

I'm looking for someone proficient in data entry to help me transform scanned PDF documents into an organized spreadsheet format. Ideal Candidate: - Proven experience in data entry from PDF to excel or similar - Precise attention to detail to ensure accuracy of the data - Efficiency to meet deadlines with minimal supervision Principal Duties: - Convert scanned PDFs into an Excel spreadsheet - Focus on extracting and entering text content from the PDF documents - Maintain the overall integrity of the original information - Ensure the accuracy and reliability of the final spreadsheet data

...then saved. - The last three years AIS data copied and pasted into separate word documents , and then saved. Please note these are separate links you will need to click on as the data is on a web page and not downloadable, therefore it needs to be copied and pasted into individual word documents. - The last three years financial reports downloaded and file renamed as per the video. These are .pdf documents. - The organizations governing document downloaded (located at bottom of page) and renamed, as per the attached video - The organizations constitution downloaded (located at bottom of page) and renamed, as per the attached video In total there should be nine documents per organization. I then require these nine documents to be saved in a folder on my Google Drive wi...

I need a professional to convert my Arabic PDF document to a simplistically designed PowerPoint. Your key task will be to effectively summarize each page of the PDF into comprehensible slide content for a presentation. Ideal skills and experience: - Proficient in Arabic language. - Exceptional understanding of making presentations that are easy to comprehend. - Effective in translating complex content into concise and straightforward information. - Knowledgeable about placing content effectively within PowerPoint's simple design framework.

I'm looking for a freelancer who can help me create an educational, well-structured custom interactive PDF about Baz Luhrmann and his work, with a focus on The Great Gatsby. This PDF will be primarily used as a personal project. Key Aspects: - The PDF should contain tabs that when clicked on, lead to different pages. REQUIREMENTS: The tabs I want in the PDF are: - "Home page" (Baz Lurhmann's name in bold with the word director underneath. With a decorative background made in his style) - "Biography" (about the director and his work) - "Portfolio" (make sure to include The Great Gatsby, Link one to its own sub-page. Use 3/4 of his works/movies and describe them.) - "Design Language" (a page talking abo...

I'm seeking a talented writer with a nutrition background to create a high protein recipe E-Book for my online training and nutrition coaching business based in Australia, Key project elements: - The book should be in PDF format. - It should include recipes with complete nutritional information, particularly macro breakdowns for each one. - Should include breakfast, lunch, dinner and snack options. - The ingredients should be Australian based- things that are sold in Australia Ideal Skills: - A strong understanding of nutrition, specifically macronutrients. - Experience in ebook writing and formatting, preferably with a focus on recipe or health books. - Ability to create engaging and informative content. - Precise, clear, and concise writing style. Please note, additiona...

I am seeking a professional who can assist me in entering text data from a PDF file into an Excel spreadsheet. The PDF contains less than 100 records. Key Responsibilities: - Data entry of text information from a PDF file into an Excel spreadsheet accurately. Skills and Experience: - Proficient in data entry, particularly working with text data. - Experienced in using Excel for data input. - Attention to detail and accuracy is paramount. - Able to complete the task in a timely manner.

We're looking for multiple competent native English editors to trim content and help us improve English language usage across a large batch of tutorials. Starting with a paid trial. Please bid $18.

I'm seeking an experienced Android mobile app developer to build a General Knowledge (GK) app that has a leaderboard feature. Key requirements: - Familiarity with Android development: The app is strictly for Android users, thus the freelancer should have top-notch skills in Android app development. - Experience in gaming platform: The mobile app is designed to incorporate gamified elements, essentially a leaderboard, so want someone with skills in integrating such features. - Understanding of GK apps: A relevant experience in creating GK apps would be an advantage to ensure the functionality, ease, interactivity and engagement factors are intact. To briefly outline the project, the primary function of the app ...

I'm seeking an experienced Android mobile app developer to build a General Knowledge (GK) app that has a leaderboard feature. Key requirements: - Familiarity with Android development: The app is strictly for Android users, thus the freelancer should have top-notch skills in Android app development. - Experience in gaming platform: The mobile app is designed to incorporate gamified elements, essentially a leaderboard, so want someone with skills in integrating such features. - Understanding of GK apps: A relevant experience in creating GK apps would be an advantage to ensure the functionality, ease, interactivity and engagement factors are intact. To briefly outline the project, the primary function of the app ...