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I need an app that lets a single user session stay active on two devices or two separate screens at the same time, with every action mirrored instantly between them. Think of it as logging into one account, then being able to work from two viewpoints in parallel without either screen forcing the other to log out. Scope of work The build must run smoothly on both iOS and Android, so a shared-code approach such as Flutter or React Native makes sense, but I’m open to whatever framework you are most confident will hit the performance target. Authentication is a straightforward email-and-password flow; no social or biometric options are necessary. The interface should stay simple and minimalistic—clean lines, uncluttered navigation, and nothing more than the fields, buttons, and indicators required for the dual-screen workflow. Key requirements • One account, two simultaneous active screens • Real-time sync of actions between screens (no noticeable lag) • Automatic session recovery if one screen temporarily disconnects • Secure backend handling for credentials and data in transit • Clear documentation so I can hand the build to another developer or my in-house team later Deliverables 1. Production-ready iOS and Android builds 2. Complete, well-commented source code 3. Brief setup guide for the backend or any third-party services used 4. Short user guide that explains how to initiate and manage the two-screen mode Acceptance criteria The job is finished when I can install both apps, log in with the same email/password on two devices simultaneously, interact from either side, and see updates mirrored instantly without either device being forced out. If you have tackled real-time sync or multi-device session problems before, tell me what you shipped and how you solved latency and conflict issues.
Project ID: 40656970
33 proposals
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Active 6 days ago
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33 freelancers are bidding on average ₹8,492 INR for this job

Hi, I can build this dual-screen session app in Flutter for iOS and Android from one codebase. I would use a WebSocket-based real-time sync layer (or Firebase Realtime DB) so actions on either screen mirror instantly, with conflict resolution to keep both sides consistent under concurrent input. Sessions would be token-based rather than tied to one device, so the same login runs two active screens without forcing a logout, plus automatic reconnect if one screen drops. UI stays minimal as requested, with credentials and data encrypted in transit. I have handled real-time multi-device sync before, solving latency with optimistic UI updates and server reconciliation. Delivery includes production builds, commented source, a backend setup guide and a short user guide. Regards, Harsh Thoriya
₹7,000 INR in 7 days
8.3
8.3

Hi, I can build this as a **Flutter app for iOS and Android** with secure email/password authentication, two simultaneous active sessions, and real-time action syncing between both devices. I’d use **WebSockets/Firebase real-time services** with conflict handling, reconnect logic, and session recovery so neither device gets logged out and updates stay nearly instant. You’ll receive production-ready builds, clean source code, backend setup documentation, and a short user guide. Ready to start. Best, Mehboob
₹9,000 INR in 7 days
6.0
6.0

With over 8 years of experience in full stack development, I feel confident that I can deliver a high-quality app to meet your dual-screen account control needs with precision and speed. My experience includes prior work dealing with real-time sync and multi-device session issues, which will prove invaluable for tackling the complexities of the project. Having built 200+ successful projects in my career, I bring a deep understanding of efficient code architecture to maximise performance on both iOS and Android platforms. As a Flutter expert with mobile app development emphasis, your project aligns perfectly with my skill set. Flutter's shared-code approach ensures consistent performance across platforms making it ideal for real-time data processing and syncing - a critical aspect for your project. I work to incorporate clean lines, uncluttered navigation, and essential elements into user-interfaces to ensure maximum effectiveness along minimalistic principles. Upon completion, not only will you receive production-ready builds for both iOS and Android but also comprehensive documentation encompassing well-commented source code, setup guide for the backend or any third-party services used, and a brief user guide. I also offer long-term support post-handover as technology evolves. I'm confident that my dedication to delivering high-quality products aligned with enduring commitment to service will make me an asset in bringing your vision into fruition!
₹14,500 INR in 7 days
5.0
5.0

With nearly a decade of corporate expertise in web and mobile development, I, Neha, am uniquely positioned to ensure your project's success. Proficient in multiple frameworks including Flutter and React Native, I have the capacity to cater to your dual-screen account control needs across both iOS and Android platforms proficiently. During my professional tenure, my team and I have successfully delivered projects which demanded real-time synchronization and multi-device functionality akin to your need. Whether it was eliminating latency issues or minimizing data conflicts, our meticulous coding combined with smart backend solutions have always delivered reliable and intuitive applications. Choosing my services would also mean giving yourself a long-term advantage. Through clear documentation and well-commented code structures, I ensure the seamless transition of projects to subsequent development stages in-house or with other developers. Apart from this, you would also benefit from timely after-delivery support (three months), ensuring that any tweaks or enhancements are taken care of post-launch. Add to that cost-effective pricing models and comprehensive IT solutions - you've got yourself an award-worthy-development package with me!
₹17,000 INR in 7 days
5.3
5.3

Hi, Thanks for posting "Dual-Screen Account Control" — it lands right in our wheelhouse, and we'd be thrilled to bring it to life. I don’t just want to tick the boxes here; my aim is to hand you something that genuinely goes beyond what you pictured. From your brief I can see this involves android, ios, flutter — all areas we handle in-house. We specialise in Mobile App Development, iPhone, Android, C# Programming, which lines up directly with what you need. How we'd approach it: - Finalise the screens, user flows and feature list with you - Build smooth, native-feeling UI with clean, maintainable code - QA on real devices, then prepare and ship to the store(s) - Post-launch support and iteration once you’re live I also noted you don’t need social or biometric options — that’s clear, and I’ll keep the work clean and strictly on-brief. I’ll fold in your feedback fast and keep refining until the result feels exactly right to you. If it helps, I can share a couple of relevant samples and a short plan before you decide. Looking forward to it! Best regards, FreeLancers360 Let’s connect in chat and get started — message me anytime and I’ll reply right away!
₹1,500 INR in 5 days
4.5
4.5

The core challenge here is not allowing two logins, but keeping both devices in a consistent real-time state without duplicate actions, session conflicts, or data loss when connectivity drops. I would build the mobile apps with React Native or Flutter and use a backend that supports persistent real-time connections, such as WebSockets or a managed real-time service. Each authenticated device would join the same account session, and state-changing actions would be published through the backend so the second device receives them immediately. For reconnects, I would maintain session state and event/version information server-side so a device can recover missed updates instead of starting from an outdated local state. I would also define conflict-handling rules for cases where both devices perform actions almost simultaneously. Authentication would allow two approved active sessions without one invalidating the other, while still supporting secure token rotation and logout/revocation. I would deliver both mobile builds, source code, backend setup documentation, and a concise guide for managing dual-screen sessions. What exact actions or application data need to be mirrored between the two screens?
₹7,000 INR in 7 days
4.4
4.4

With my 13+ years of experience as a Full Stack Web & Mobile Application Developer, I am confident that I am the perfect fit for your Dual-Screen Account Control project. Having successfully built numerous real-time sync and multi-device session applications in the past, I understand the importance of syncing actions instantaneously between screens without any noticeable lag. This finely honed skill is a key aspect that positions me perfectly to deliver on your project requirements. Moreover, my proficiency in cross-platform development using React Native ensures not only smooth functioning on both iOS and Android platforms but also provides an opportunity for code sharing that enhances the performance target significantly. What sets me apart is my ability to tackle varying security challenges with unwavering efficiency. Rest assured, your app's backend handling for credentials and data in transit will be held under stringent security measures. Lastly, I am dedicated to not just timely delivery but also ensuring your long-term ease with the product through comprehensive documentation. My implementing detailed setup guides, thoroughly-commented source code, and short user guides will leave you and your team fully equipped to take over and manage the app seamlessly in future. Let's get started and turn your idea into an exceptional reality that massively elevates productivity for dual-screen account management!
₹7,000 INR in 7 days
4.4
4.4

As an experienced developer with a strong background in mobile app development, backend development, and cross-platform frameworks like Flutter and React Native, I am confident in my ability to tackle your Dual-Screen Account Control project. My primary goal is to bring your vision to life: an intuitive, real-time sync application that allows for seamless dual-screen sessions whilst maintaining excellent security measures. In previous projects, I've built responsive systems that ensure simultaneous updates across multiple devices without noticeable latency or conflicts. This experience will prove invaluable as I strive to meet your key requirements of uninterrupted session recovery and instant mirroring of actions. Additionally, I am well-versed in handling secure backend credentials and data in transit—ensuring your user's information is always safe. The delivery of high-quality, scalable solutions doesn't end with writing code. Along with the production-ready iOS and Android builds containing cleanly commented code, I'll provide concise setup and user guides. These will enable smoother handover to other developers or your in-house team if required later on. Ultimately, you can expect a structured roadmap from start to finish for smooth project execution and effective post-launch support.
₹7,000 INR in 3 days
4.7
4.7

Hello! I'm Karthik, a seasoned developer with over 15 years of experience in mobile app development. I understand your need for a dual-screen account control app that operates seamlessly on both iOS and Android. My approach will utilize Flutter for a shared codebase, ensuring optimal performance and quick development. I have successfully implemented real-time sync solutions in previous projects, effectively tackling latency issues to guarantee instant mirroring of actions between devices. Key Features: - One account, two active screens with real-time action synchronization. - Automatic session recovery for seamless user experience. - Secure backend for safe credential management. - Minimalistic user interface focusing on functionality. Deliverables: 1. Production-ready iOS and Android apps. 2. Well-commented source code. 3. Setup guide for backend services. 4. User guide for managing dual-screen mode. I’m excited about the opportunity to collaborate and deliver a high-quality solution. Let’s discuss how I can bring this project to life! Best, Karthik
₹25,000 INR in 7 days
3.8
3.8

You need one authenticated account to remain active on two devices while both screens behave like a synchronized workspace, including reconnects, conflicts, and session recovery without either device being kicked out. I’ve built production systems using React Native, WebSockets, PostgreSQL, and real-time event pipelines, including multi-user backend work at Poundit where state consistency and reliable transaction flows mattered. I’d use React Native for the shared iOS/Android client with a Node.js backend, WebSockets for low-latency event delivery, and PostgreSQL for persistent state. Sessions would be device-aware rather than single-token, allowing two authorized connections under one account. Each action would carry an event/version identifier so duplicate messages, reconnects, and conflicting updates can be resolved predictably. The client would automatically resubscribe and reconcile state after network interruption rather than assuming the screens stayed synchronized. You’ll receive both builds, source, backend setup documentation, and the two-screen usage guide. What specific actions or data need to be mirrored between the two screens?
₹5,000 INR in 1 day
2.9
2.9

Hi, I can build the dual-screen account app in React Native for iOS and Android, letting one email/password session stay live on two devices with actions mirrored instantly and auto-recovery on drop. I can start today. I will handle real-time sync through WebSockets with a last-write-wins conflict rule and a short replay buffer so a reconnecting screen catches up cleanly. Questions: 1) Which actions must mirror, full UI state or specific data events? 2) Do you have a backend preference, Supabase, Firebase, or custom Node? Looking forward to discussing further. Regards, Shayan.
₹5,350 INR in 3 days
2.1
2.1

Direct answer: most apps force one screen out because of single-session auth — one valid token per account, so logging in on device B kills device A. I build it the opposite way: the account issues multiple concurrent session tokens, so both screens stay logged in indefinitely. That's the core of what you're describing. Real-time sync: both screens subscribe to one live channel (WebSocket via Firestore or Supabase Realtime). An action on one writes to shared state and pushes to the other in well under a second — no polling, no visible lag. Session recovery: each screen holds its token locally and auto-reconnects if the channel drops, then pulls the latest state so it's never stale. Stack: Flutter — one codebase, identical on iOS and Android. Deliverables: production iOS + Android builds, commented source, backend setup guide, two-screen user guide. One honest question on conflict handling: when both screens act on the same item at once, do you want last-write-wins (simplest) or should an item lock while in use? Tell me what "actions" the screens perform and I'll match the sync layer to it. Aakaash
₹12,500 INR in 2 days
1.6
1.6

Hi, Thanks for sharing your project. It aligns well with work I’ve successfully completed for other clients, and I’m confident I can deliver a high-quality solution tailored to your requirements. Before providing an accurate timeline, scope, and budget, I’d like to clarify a few key details to ensure we're aligned from the start. Freelancer’s proposal character limit makes it difficult to cover everything thoroughly here. If you're available, let's connect via chat. I can walk you through similar projects I've completed, discuss the best approach for your specific requirements, and answer any questions you may have. Once I understand your expectations, I'll provide a clear execution plan with realistic timelines and pricing. I’m ready to get started as soon as we finalize the details and look forward to working with you. Best regards, Royal IT service
₹7,000 INR in 7 days
0.0
0.0

⭐ Dear Client! ⭐ ̗̀♡ I can begin within the next minute! ‧₊˚✧ I noticed you need a ✅Flutter app that keeps one account active on two devices with real time action syncing. I can help with building the iOS and Android app, secure login, two simultaneous sessions, and instant syncing between devices. I’ll also handle reconnecting after temporary network issues and make sure the backend keeps data and sessions secure. I’ll keep the interface simple and the sync system reliable, with clear source code and setup documentation. How is the shared data currently stored, or should I build the backend and real time sync layer as well? I am looking forward to contributing to your success! Regards, Kelley.
₹10,108 INR in 3 days
0.0
0.0

You're right to worry about session conflicts when two screens try to write at the same time. I'd handle this by tagging every action with a microsecond timestamp and a device ID, then letting the backend decide which one wins if they collide. That keeps the mirroring instant for the user while avoiding race conditions. In my experience, most real-time sync setups fail when the network drops for a second. I'd build a local queue on each device that stores actions for up to 30 seconds, then replays them once the connection comes back. You'll get smooth recovery without losing any user input, even on spotty Wi-Fi.
₹10,000 INR in 3 days
0.0
0.0

I can build your dual-device mobile app with simultaneous sessions, real-time action syncing, automatic session recovery and secure backend communication for iOS and Android. I have 5+ years of experience in Flutter, React Native, mobile development and real-time backend systems, with a focus on smooth synchronisation and reliable performance. Please open the chat window so that I can share my portfolio and we can proceed further on this project. In addition to your project needs, I'll provide you with clean source code, free bug patches, and maintenance. I am awaiting your positive response. Regards Ritesh
₹1,500 INR in 7 days
0.0
0.0

Building an app that allows a single user session to remain active on two devices simultaneously presents a unique challenge that I am excited to take on. As a seasoned Unity Game Developer, I have exceptional skills in creating smooth gameplay mechanics, advanced character controls, and intuitive UI systems — all of which can play a huge role in making this dual-screen account control application seamless and user-friendly. Furthermore, my expertise in mobile optimization for both Android and iOS ensures that the build I deliver will run smoothly on both platforms without any performance issues or bugs. I also understand the importance of a clean code base and thorough documentation for future development, and I guarantee these will be meticulously integrated into the project. Although my previous projects revolved around real-time synchronization and conflict resolution in gaming, the underlying principles and techniques align closely with your requirements. My experience working on immersive multiplayer games required me to implement robust synchronization methodologies to ensure smooth interactions between players in various scenes. To sum it up, my passion for creating high-quality applications combined with my game development expertise gives me a solid foundation upon which to build this dual-screen account control app. Let's discuss how I can ensure your vision is transformed into reality in the most efficient and creative way possible!
₹10,000 INR in 5 days
0.0
0.0

Hello, I can build this dual-screen mobile application with Flutter and a secure real-time backend, supporting iOS and Android from a shared codebase. The key requirement I understand is that the same account must remain active on two devices simultaneously, with actions and state changes synchronized in real time without forcing either device to log out. My approach would include: Flutter-based iOS and Android application Secure email/password authentication Multi-device session management for the same account WebSocket/Firebase-based real-time event synchronization Automatic reconnect and session recovery Conflict-safe state handling when both devices perform actions simultaneously Secure API communication and credential handling Clean, minimal UI focused on the dual-screen workflow Well-structured, commented source code and backend documentation For synchronization, I would use an event/state-based architecture rather than simply refreshing data. Each device can receive changes immediately, while the backend remains the source of truth. I would also implement reconnection handling so temporary network interruptions do not unnecessarily terminate the active session.
₹1,500 INR in 7 days
0.0
0.0

I appreciate your thorough project description, and I am confident that my extensive experience in both backend development and mobile app development using C#, Flutter, and React Native would make me an ideal fit for this project. To put it simply, I specialize in building and delivering complex, end-to-end solutions with clean and scalable architecture – just what your project calls for. In regards to the dual-screen functionality you're aiming for, one of my notable past projects involved building a real-time sync feature enabled multi-device session management where a user session would stay active on multiple screens simultaneously. This required intense focus on ensuring minimal latency and resolution of conflicts while maintaining data integrity across multiple devices – something that aligns perfectly with your requirements. Furthermore, as a solo developer who's used to handling projects from planning and design to implementation and deployment, I provide not just top-notch technical skills but also clear communication and reliable delivery. With me, you get an all-rounded package which includes post-deployment maintenance and continuous improvement - offering you peace of mind about the long-term scalability and support of this unique dual-screen app.
₹7,000 INR in 7 days
0.0
0.0

When two devices keep the same session alive, token refresh collisions can cause one screen to be logged out unexpectedly. I'll use a single server-side session store with versioned updates so each client can apply changes without overwriting the other. A lightweight WebSocket channel will push actions instantly, and if a device drops, the client will replay missed events once it reconnects. A common pitfall is assuming the backend can handle duplicate writes without checking timestamps, which leads to flickering UI. I'll add a simple timestamp check and merge strategy so the most recent action wins, keeping the UI consistent across both screens. Ready to start immediately and deliver clean, commented Flutter code for iOS and Android.
₹7,000 INR in 4 days
0.0
0.0

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