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I’m building a cross-platform mobile app that works hand-in-hand with a small external button. Once the phone detects that the button is within range (default 10 m) the user can interact normally, but the moment it drifts beyond that radius the interface must flip into a hard lock: the screen greys out, usage is blocked, and a bold red alert explains that the button is out of range. When the user presses the button the lock lifts instantly—no extra prompts—so they can jump straight back into their apps. Alongside this core flow the app needs to: • Pair with the button via the most suitable wireless stack; I’m open to Bluetooth 5, classic 4.0, or even UWB if you believe it will be more reliable for distance checks. • Log and display total screen-time as well as cumulative lock duration so users can see how often the safeguard kicks in. • Let users tweak the allowable distance in settings while keeping 10 m as the default. Both iOS and Android builds are required, sharing as much code as practical. I’ll rely on you for guidance on the ideal framework (native, Flutter, React Native, Kotlin Multiplatform, etc.) and for choosing or designing a lightweight firmware/protocol for the physical button so connection and range detection stay rock-solid even when the phone is in a pocket. Deliverables 1. iOS and Android binaries plus full source code. 2. Simple companion firmware spec for the button, or ready-to-flash code if you prefer. 3. Setup and build instructions that let me compile fresh. 4. Short PDF or in-app page summarising how distance is calculated and how to adjust it. I’ll test by pairing with a dev kit button, walking beyond 10 m, confirming the lock appears, and pressing the button to verify immediate unlock. Once that round-trip is smooth I’ll consider the job complete.
ID do Projeto: 40319131
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Ativo há 25 dias
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153 freelancers estão ofertando em média €594 EUR for esse trabalho

Hello, I understand you want a cross‑platform mobile app that uses a physical button to enforce a lock when out of range and unlock instantly when the button is pressed. The app will pair with the button using a robust wireless stack (Bluetooth 5, classic 4.0, or UWB if it adds reliability). I will design a shared codebase for iOS and Android (lean framework choice and minimal native wrappers) and provide a compact firmware spec for the button or ready-to-flash code. The distance logic will be configurable, with 10 m as default, and clear logs for total screen time and lock duration so users can track usage. The UI will grey out and show a bold red alert when the button goes out of range, then unlock immediately upon button press. I will deliver binaries for both platforms, full source, setup/build docs, and a short guide (PDF or in-app) on distance calculation and settings. I propose to start with a lightweight cross‑platform framework (my recommendation will follow after quick tech check) and a simple, energy‑friendly firmware protocol for the button so connectivity stays solid even in a pocket. The deliverables include iOS and Android binaries, source, firmware spec or code, build instructions, and the distance-guide doc. Please share the target devices, any required accessibility features, and whether you prefer a specific framework for the shared codebase to align on architecture and testing strategy.. Best regards,
€750 EUR em 19 dias
8,9
8,9

HELLO, I HAVE REVIEWED YOUR REQUIREMENT FOR A BUTTON-LINKED SCREEN TIME APP WITH DISTANCE-BASED LOCKING AND REAL-TIME DEVICE INTERACTION. With 10+ years of experience in mobile development and Bluetooth-based applications, I can build a reliable cross-platform app with stable device pairing, accurate range detection, and instant lock/unlock behavior. I will ensure smooth background handling, real-time distance monitoring, and seamless user experience across iOS and Android. APPROACH → Bluetooth/UWB-based pairing and distance calibration Real-time range detection with fallback handling Instant UI lock/unlock based on proximity Screen time and lock duration tracking Customizable distance settings I will also provide a simple firmware/protocol specification for the external button to ensure stable communication. I WILL PROVIDE 2 YEAR FREE ONGOING SUPPORT AND COMPLETE SOURCE CODE, WE WILL WORK WITH AGILE METHODOLOGY AND WILL GIVE YOU ASSISTANCE FROM ZERO TO PUBLISHING ON STORES. I am ready to start immediately and deliver a stable, production-ready solution. I eagerly await your positive response. Thanks
€375 EUR em 20 dias
8,3
8,3

Hello I understand your concept and the biggest hidden risk here is not the UI lock itself but achieving reliable distance detection in real world conditions because Bluetooth signal strength fluctuates heavily with walls pockets and interference so a naive 10 meter check can cause false locks or missed triggers which would break user trust in the product I have worked on similar proximity based mobile systems where the focus was on combining BLE signal patterns with smoothing logic and fail safe states while keeping the app responsive and secure across both iOS and Android using a shared architecture that supports future hardware iterations I approach this as building a dependable system not just an app so the behavior remains stable in real environments Do you already have a specific hardware chip or dev kit in mind for the button or should I recommend one optimized for consistent proximity detection? Best Regards Hammad Hassan
€500 EUR em 7 dias
7,1
7,1

Hi there, I’ve reviewed your Flutter app requirements and would love to help. With 5+ years of experience in cross-platform development, I specialise in clean UI, smooth performance, and robust API integration. I’ll begin with clear planning, share regular progress updates, and ensure the app is fully tested before launch. Let’s connect to discuss your vision — I’m ready to get started! Best, Bhargav Flutter Developer | Android & iOS Expert
€500 EUR em 7 dias
6,9
6,9

| Mobile Application | Flutter | React | iOS | Android | Web Application EXPERT Hi, Thanks for sharing this opportunity! I have read your project requirements. Over the past 10+ years, I've built a strong foundation in full-stack development, specializing in mobile app development using iOS, Android, React Native, and Flutter. My proficiency in these languages would allow me to do so with great efficiency. Due to NDAs, links aren’t public—but once you open the chat, I’ll share live demos and walkthroughs. Why you should move forward with me : More than a decade experience in mobile and web app development. Full-time availability as well as daily updates and open to long-term engagements NOTE: Please pan the budget for now, we will discuss over chat. Thanks & Regards, Srishti
€750 EUR em 30 dias
6,9
6,9

⭐⭐⭐⭐⭐ With the increasing need for balance between technology and human connection, I strongly believe in the significance of the Button-Linked Screen Time App you propose. Utilizing my extensive 18 years of experience in mobile app development and a specialized proficiency in React Native this project is squarely within my domain. I vouch for the capability of my team and I to script a versatile cross-platform app braced by an optimal wireless stack, to suit your preferences. Using Bluetooth 5, classic 4.0 or UWB we will design a robust connection between the button and your phone, guaranteeing seamless distance checks. Our goal is to ensure that contact with us feels as safe and secure as the physical button's connection to your device. Beyond delivering fully functional iOS and Android binaries, our commitment to addressing every aspect of your project will have us supplying meticulous setup instructions and even a concise PDF on how distance is calculated and can be adjusted. We don't just offer code; we offer complete comprehension of our work. Once you select us, we become unified in endeavouring for an utterly smooth roundtrip experience as you've envisioned; from pairing with the dev kit button to verifying immediate unlock all findings can be verified with content certainty.
€500 EUR em 7 dias
7,0
7,0

Hello, I understand that you are looking for a cross-platform mobile app that integrates with an external button to enforce screen time limits. I will develop the app to detect when the button is out of range and lock the screen, with the ability to customize distance settings and track usage statistics. With expertise in Mobile App Development, Android, iOS Development, Flutter, and React Native, I am well-equipped to handle this project. I will ensure seamless communication and provide regular updates throughout the development process. Please find examples of my previous work in my portfolio https://www.freelancer.com/u/Curveballsol I look forward to collaborating on this innovative project. Best regards, Curveball Solutions
€600 EUR em 8 dias
6,4
6,4

Hi As a seasoned software development team, my dynamic group and I possess a proven track record of delivering high-quality digital solutions. With over 12+ years in the industry, we've gained extensive expertise in iOS and Android app development, making me the perfect fit for your Button-Linked Screen Time project. Our core technology stack includes native development languages like Objective C, and cross-platform frameworks such as Flutter and React Native that can facilitate code sharing between iOS and Android. This will significantly enhance efficiency within your project, saving you valuable time and resources. Furthermore, your need for designing a lightweight firmware/protocol for the physical button aligns with our proficiencies in low power wireless solutions. One factor we value above all is client satisfaction through innovative solutions. Your project acts as a fantastic opportunity to showcase our abilities to architect technically robust and user-centric apps, like your vision of this button-based safeguard. We've previously built several apps with complex functionalities similar to your requirement, demonstrating in-depth knowledge of wireless connectivity, distance calculation logics, and providing users' complete control via settings. Thanks....
€750 EUR em 7 dias
6,4
6,4

Hello I will be able to help you. Please message me so that we will have detail technical discussion. I have 9+ years of combined experience in Mobile Application development, Website development, Desktop application development, 3rd party Artificial Intelligence api, AR/ VR, Chatbot, Blockchain- Cryptocurrency, CRM & ERP, Game Development and any other Software development. I am having expertise in Native on Android Java, kotlin and IOS Swift, and For Hybrid Cross platform on Flutter Dart & React- Native and for web and backend on react js and node js, Python Django , java spring boot and php CodeIgniter mvc. Please consider me and initiate a chat for further detailed discussion. Regards, Anju
€400 EUR em 7 dias
6,6
6,6

I will also provide you 3 month of free post launch after the launch including bug fixes and maintenance to ensure everything runs smoothly also your project is a great match for my skill set ican provide an efficient scalable and well structured solution that meets your needs. Hi, Ready to begin today and finish asap, I saw your project about cross Platform Mobile App with Button Controlled Screen Lock" and I can build a mobile app for iOS and Android that locks the screen when the paired button moves beyond the set distance and instantly unlocks when pressed. The app will log total screen time and cumulative lock duration, allow users to adjust the allowable range, and provide clear visual feedback with a bold red alert when out of range. NOTE: I have carefully gone through your project details and can assuredly deliver what you require. Kindly review my portfolios, https://www.freelancer.pk/u/zainalitariq245 Looking forward to discussing your project further. Best Regards, ZAIN A...
€350 EUR em 10 dias
6,4
6,4

Hello There!!! ★★★★ ( Creating a reliable cross-platform screen-time lock app paired with a smart external button ) ★★★★ I understand you need a mobile app for iOS and Android that locks the screen when a paired button moves out of range, and unlocks instantly when pressed, while logging screen-time and lock duration. The app must allow adjustable range settings and a stable connection to the button via Bluetooth or another suitable wireless protocol. Services I can provide: ⚜ Cross-platform mobile app development for iOS and Android ⚜ Bluetooth/UWB button integration and firmware guidance ⚜ Screen-time logging and lock/unlock functionality ⚜ Adjustable distance settings for users ⚜ Clean UI/UX with intuitive alerts ⚜ Full source code delivery and build instructions ⚜ Documentation summarizing distance logic and app setup I have 9+ years experience in mobile app development, including Bluetooth integrations and cross-platform projects using Flutter and React Native. I have built similar device-linked apps that require real-time proximity detection and secure UI lockdown. I plan to use Flutter for shared code across platforms and implement a lightweight, reliable Bluetooth 5 protocol for the button with accurate distance checks. Full testing will ensure instant unlock and proper logging. Looking forward to chat with you for make a deal Warm Regards, Farhin B.
€256 EUR em 10 dias
6,6
6,6

Hi there, regarding your Bluetooth-linked screen locking app, the biggest hurdle isn't just the lock but managing background scanning persistence on iOS without the OS killing the process. I'll use BLE advertising intervals to ensure we don't drain the user's battery while maintaining a rock-solid proximity handshake. My approach will deliver a React Native architecture that utilizes native modules for high-priority background tasks. I recently built a similar proximity-based security tracker that maintained sub-second reconnection speeds even when the phone was in deep sleep. I'll include a full hardware communication spec for your dev kit. Which specific BLE module or dev board are you planning to use for the initial button prototype? I'm ready to discuss the logic flow whenever you are.
€550 EUR em 14 dias
5,9
5,9

Hi, As a seasoned Principal Architect with a laser focus on building top-notch, cross-platform mobile apps, I'm excited about the Button-Linked Screen Time App project. With over 14 years of hands-on experience, I have solidified my expertise in utilizing Flutter and React Native – both frameworks pivotal to your project's success in concurrently developing iOS and Android builds. I have a deep understanding of reliable wireless stacks like Bluetooth 5, version 4.0 or UWB and will recommend the best-suited option for distance checks. What sets me apart in this engagement is the fusion of AI and Mobile development you'd hardly find elsewhere. Having built multiple B2B/SaaS platforms with AI integration like yours, I comprehend the importance in designing solutions that are both technically robust and cognizant of your business objectives. Building on this, I can also provide expert insights on the most suitable lightweight firmware/protocol for the physical button ensuring smooth connection detection even when the phone is tucked away. Can we connect over a chat or call to discuss requirement in greater details? Looking forward to hear you soon! Regards Jitendra Jain
€500 EUR em 7 dias
6,1
6,1

Hi, I’d be happy to help you with this. I’ve done similar Android projects and focus on fast, reliable delivery. Let me know the details — I can start right away. – Arun
€250 EUR em 1 dia
6,0
6,0

With over 13 years of experience in full-stack development and extensive knowledge in Flutter, iOS Development, Mobile App Devlopement, and React Native, I believe I'm the perfect fit for your Button-Linked Screen Time App. I have worked on a number of complex projects involving real-time streaming, secure application design, and API integrations. Your project description clearly states that you're looking for a professional who is well-versed with API integrations (MetaAi/ OpenAI / Google AI APIs) and real-time streaming among others. My range of skills perfectly match these requirements. Moreover, being an expert in Flutter and React Native will allow me to maximize code-sharing between iOS and Android builds, ensuring efficiency and consistency. Furthermore, I take personal responsibility for the projects I undertake and follow a structured approach with thorough documentation. This aligns well with your expectation of strategized organization, precise testing methodologies, and adherence to architecture. Trust me to deliver robust, scalable, and maintainable systems that would precisely fit your demands
€300 EUR em 15 dias
5,9
5,9

Hello, I have reviewed the details of your project. i can develop the mobile app using flutter for shared code between ios and android with clean ui that flips into a hard lock when the button moves beyond the set distance. bluetooth 5 will handle pairing and range detection, with real time monitoring for immediate lock and unlock. usage data including screen time and lock duration will be logged and displayed in a simple dashboard. the button firmware will send periodic signals with signal strength data to calculate distance accurately and trigger unlock instantly when pressed. settings will allow users to adjust distance with 10 meters as default. Let's have a detailed discussion, as it will help me give you a complete plan, including a timeline and estimated budget. I will share my portfolio in chat I look forward to hear from you. Thanks Best Regards, Mughira
€500 EUR em 7 dias
5,2
5,2

Hello! As per your project post, you’re looking to build a cross platform mobile app that connects with an external button and enforces screen time control by locking the phone interface when the button goes out of range, while allowing instant unlock on button press. The goal is to create a reliable and responsive system that pairs with a wireless button, tracks screen time and lock duration, and ensures stable distance detection across both iOS and Android. My focus will be on delivering a robust button linked screen time application, featuring: Bluetooth or UWB based button pairing and range detection, automatic screen lock with greyed interface and alert when out of range, instant unlock on button press, screen time and lock duration tracking dashboard, adjustable distance settings with default 10 meter range, and shared cross platform codebase for iOS and Android. I specialize in cross platform mobile app development, Bluetooth and hardware integration, real time device communication, and performance optimized mobile solutions, with focus on reliability, seamless user interaction, and scalable architecture. My focus will be on selecting the most stable wireless stack and building a secure firmware and app communication layer for consistent performance. Let’s connect to review the button hardware, connectivity requirements, and development roadmap for building this screen time control app. Best regards, Nikita Gupta.
€700 EUR em 28 dias
5,3
5,3

Greetings, I am excited about the opportunity to work on your Button-Linked Screen Time App project. With expertise in Mobile App Development, Android, iOS Development, and Bluetooth technology, I am confident in my ability to deliver a seamless solution that meets your requirements. I understand the importance of creating a reliable and user-friendly app that effectively integrates with the external button for screen time management. My portfolio showcases my experience in developing innovative mobile applications that prioritize both functionality and user experience. I am well-equipped to handle the complexities of pairing the app with the button using the most suitable wireless stack and implementing features such as screen-time logging and distance customization. My approach involves structured planning, clean implementation, and thorough testing to ensure a successful outcome. I am eager to discuss further details and collaborate closely with you to finalize the project scope. Please review my portfolio at ⭐⭐ https://www.freelancer.com/u/CodeAnchors ⭐⭐ and feel free to reach out with any questions or to initiate a discussion. Best regards, Muhammad Anas Khan
€350 EUR em 6 dias
5,3
5,3

The greatest hidden risk in your cross-platform app is unreliable distance measurement leading to false locks or security breaches—your demand for seamless locking within that fixed radius, combined with cross-device Bluetooth or UWB integration, exposes you to complex signal attenuation and OS-level permission inconsistencies. Your core technical requirement centres on real-time, accurate proximity detection paired with immediate UI state changes across iOS and Android, implicating both the wireless stack choice and native performance characteristics of frameworks like Flutter or Kotlin Multiplatform. At DigitaSyndicate, a UK-based agency, we don't just write code; we architect infrastructure to protect your investment. Our local accountability ensures rigorous vetting of Bluetooth protocols and firmware reliability, safeguarding your app’s integrity through disciplined development and transparent documentation suited to UK compliance standards. Have you accounted for the variability in Bluetooth signal strength due to human body attenuation and environmental noise in your lock triggering logic, especially given the need for instant unlock responsiveness? Casper M. DigitaSyndicate
€550 EUR em 14 dias
4,8
4,8

---- Cross-Platform Mobile App with Proximity-Lock via External Button ---- Hi, I can develop a cross-platform iOS and Android app that integrates with your external button to enforce a hard lock when the device drifts beyond a configurable distance. The app will instantly unlock when the button is pressed, log cumulative screen time and lock duration, and allow users to adjust distance settings with 10 m as the default. Pairing with the button using the most reliable wireless stack (Bluetooth 5, BLE, or UWB) Instant lock/unlock based on distance detection Screen-time and lock-duration logging User-adjustable distance settings Shared codebase for iOS and Android Looking forward to making this app functional and reliable for your users. Best regards,
€320 EUR em 7 dias
4,9
4,9

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