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I want to release a simple, calm-looking mobile app that automatically marks the Sabbath for any user, anywhere in the world. From Friday dusk to Saturday dusk— with an optional setting that carries through to Sunday— the app should detect the local sunset (GPS or manual timezone entry), pop up a gentle reminder to set the phone aside, start a visible countdown clock, and finally display a Biblical verse when the time is complete. Both iOS and Android builds are needed, preferably with a shared codebase (React Native, Flutter or a lightweight equivalent) so updates stay in sync. The reminder must appear as a popup message even if the device is locked, but should never override the user’s system settings for Do Not Disturb. Verses can live in a small local bundle for offline display; I’ll supply the text once the framework is in place. Deliverables: • Universal sunset calculation or API integration that covers every timezone • Customisable duration toggle (Friday–Saturday or Friday–Sunday) • Popup reminder, live countdown timer, and end-of-Sabbath verse screen • Clean, minimal UI and store-ready binaries for both platforms • Source code with brief setup notes so I can maintain it going forward I’m happy to walk through the flow in more detail and will provide the graphic assets and scripture list. Looking forward to working with someone who treats the idea respectfully and can move quickly from prototype to store submission.
Project ID: 40560048
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137 freelancers are bidding on average $501 USD for this job

Hello, I have carefully reviewed your requirements and understand that you want a calm, globally usable Sabbath Timer mobile app for both iOS and Android, with sunset detection, reminders, countdown functionality, and a verse display screen, built using a shared cross-platform codebase. I have 10+ years of experience in mobile app development, including Flutter and React Native, timezone-based scheduling systems, location services (GPS), background notifications, and cross-platform deployment for App Store and Google Play. My approach will include: • Building a shared Flutter/React Native codebase for iOS and Android • Integrating reliable sunset calculation (API or astronomical libraries with GPS fallback) • Implementing configurable Sabbath window (Fri–Sat or Fri–Sun) • Designing non-intrusive lock-screen notifications respecting OS Do Not Disturb rules • Creating a clean countdown timer with state persistence • Adding offline verse storage and final completion screen • Ensuring lightweight, minimal UI with calm user experience • Preparing production-ready builds for both stores I WILL PROVIDE 2 YEARS OF FREE ONGOING SUPPORT, COMPLETE SOURCE CODE, WORK WITH AGILE METHODOLOGY, AND ASSIST YOU FROM INITIAL DEVELOPMENT TO TESTING, DEPLOYMENT, AND APP STORE SUBMISSION. I eagerly await your positive response. Thanks.
$500 USD in 7 days
8.4
8.4

Hi, This is Elias from Miami. I checked the details and understand you need a calm iOS and Android app that detects local Sabbath timing from Friday sunset, shows a gentle reminder, runs a countdown, and displays a Biblical verse at completion, with an optional Friday-to-Sunday mode. The real challenge here is making time calculation reliable worldwide. GPS, manual timezone selection, sunset logic, offline verse display, notifications, and countdown behavior need to work consistently without overriding system settings. I've worked on cross-platform mobile apps involving notifications, location/timezone logic, offline content, clean UI, and App Store/Google Play deployment. I’d recommend Flutter or React Native for a shared codebase, with local sunset calculation where possible and an API fallback if needed. I’d keep verses bundled offline and build the notification/countdown flow around native platform rules. Q1 – Should the app use GPS automatically, manual location entry, or both? Q2 – Do you want sunset based on standard civil sunset, or a specific religious calculation/custom offset? Q3 – Should users be able to choose verse categories, or just receive one verse automatically? Looking forward to hearing from you.
$500 USD in 7 days
8.2
8.2

Hello, Greetings Hope you are doing well. I am a Mobile Application developer with over 5 years of experience. I am confident in my ability and skills to develop high-quality Mobile apps and would like to work on your timer app project. I will complete the work as per your requirements. I want to discuss more this project to prepare the final concept. So let’s discuss this in detail over chat then will make plans to start work on it. Waiting for your earliest reply. Thanks. Shubham
$250 USD in 14 days
8.0
8.0

Hello, I will develop your GLOBAL SABBATH TIMER MOBILE APPLICATION for Android and IOS both platforms with Web admin panel. I am Tulsiram. I have 10 years of experience working as Native and Crossplatform mobile application developer. I am understood your requirements. I am glad if we are working together. If you interested then let's connect. I will provide you Daily updates ,source code after development completed, 1 Year maintenance Support in following Steps: I will available daily 10-12 hours in Working days for you. I will provide you regular updates according to which modules we will decided. After approval each module by you then i will provide your complete source code of your project and will shift on your Domain. Thanks
$250 USD in 35 days
6.6
6.6

Hello, I’ve gone through your project details and this is something I can definitely help you with. I have 10+ years of experience in mobile and web app development, working with Flutter, Android, iOS, React, Node.js, and APIs. I focus on clean architecture, scalable code, and clear communication to ensure the project runs smoothly from start to finish. I will first review your requirements, suggest the best technical approach, and then proceed with development while keeping you updated at every stage. Here is my portfolio: https://www.freelancer.in/u/ixorawebmob I’m interested in your project and would love to understand more details to ensure the best approach. Could you clarify:What specific features would you like highlighted in the app's UI for user engagement? 1. Do you need this for mobile, web, or both? 2. Do you already have UI/UX designs or should we create them? 3. Will there be any third-party API or payment gateway integration? 4. What is your expected timeline for completion? 5. Are there any reference apps or websites you like? Let’s discuss over chat! Regards, Arpit Jaiswal
$250 USD in 22 days
7.5
7.5

Hello There!!! ★★★★ (Build a peaceful cross-platform Sabbath timer app with accurate sunset tracking and thoughtful reminders.) ★★★★ I've carefully read your project and understand you want a simple, respectful mobile app that automatically detects Sabbath times worldwide, sends gentle reminders, displays a live countdown, and shows a Biblical verse at completion. The app should work on both iOS and Android with a shared codebase and remain easy to maintain. ⚜ Cross-platform app development ⚜ GPS & timezone-based sunset calculation ⚜ Reminder & countdown timer ⚜ Offline Bible verse integration ⚜ Clean, minimal UI/UX ⚜ iOS & Android deployment ⚜ Source code & setup documentation I have experience building cross-platform mobile apps with Flutter and React Native, integrating location services, notifications, and offline content. I'll create a lightweight, reliable app with accurate sunset calculations, customizable Sabbath duration, and a calm user experience while respecting system notification settings. I also understand the importance of treating this project with care and professionalism. I value clear comunication and timely delivery, and I'd love to discuss your vision further. Warm Regards, Farhin B.
$256 USD in 10 days
6.7
6.7

Hi 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. Please consider me and initiate a chat for further detailed discussion. Regards, Anju
$500 USD in 7 days
6.6
6.6

Hi there, Hope you are doing well I'd be happy to develop your Global Sabbath Timer App with a clean, peaceful interface and reliable functionality for both iOS and Android using a shared codebase. Key Features Automatic Sabbath timing based on GPS or manual timezone Accurate global sunset calculations/API integration Friday–Saturday or optional Friday–Sunday mode Lock-screen reminder notifications Live countdown timer Offline Biblical verse display Minimal, intuitive UI Store-ready iOS & Android builds with complete source code Proposed Tech Stack Mobile: Flutter Backend (if required): Node.js Notifications: Firebase Cloud Messaging & Local Notifications Database: SQLite (offline) with optional Firebase for future updates Maps/Location: Google Location Services Version Control: GitHub I deliver clean, scalable code, regular progress updates, and complete documentation to ensure the app is easy to maintain and enhance in the future. Looking forward to working with you. Thanks & Regards, Dheeraj K.
$250 USD in 5 days
7.0
7.0

Hi, For this project, we recommend using Flutter (or React Native if you prefer) to deliver a single shared codebase for both iOS and Android. We’ll implement accurate worldwide Sabbath timing using reliable sunset calculations (or a trusted API where appropriate), support GPS-based detection with manual timezone selection as a fallback, and build the customizable Friday–Saturday or Friday–Sunday schedule. The app will include lock-screen compatible reminder notifications that respect the user’s Do Not Disturb settings, a live countdown timer, offline Biblical verse display, and a calm, minimal interface that reflects the purpose of the app. Our process includes planning the user flow, developing the core functionality, testing across different time zones and devices, preparing App Store and Google Play submissions, and delivering complete source code with documentation for future maintenance. A couple of questions: 1. Would you like the app to support multiple Bible translations in the future, or will it launch with a single version? 2. Should the sunset calculations work entirely offline using astronomical formulas, or are you comfortable using an online API with offline fallback? We’d be honored to work on this project and are confident we can move efficiently from prototype to store-ready releases while preserving the calm, respectful experience you envision. Looking forward to discussing the details with you. PRICE AND TIME IS PLACEHOLDER
$750 USD in 30 days
6.1
6.1

Hello! As per your project post, you're looking to build an Sabbath Timer Application that automatically calculates Sabbath timings based on the user's location and provides a peaceful, distraction free experience. The primary objective is to deliver a simple, reliable mobile application with accurate sunset calculations, scheduled reminders, countdown tracking, and offline scripture support across both iOS and Android. My focus will be on delivering a complete solution featuring cross platform mobile development, GPS and manual location support, automatic local sunset calculations, Sabbath start and end scheduling, optional Sunday extension, countdown timer, lock screen and local notifications, offline Biblical verse library, user preferences, timezone handling, responsive UI, battery efficient background scheduling, and clean architecture for future enhancements. I specialize in Flutter, React Native, Firebase, local notifications, location services, offline data management, REST APIs, and scalable mobile application development. My focus will be on building a lightweight, intuitive application with reliable scheduling, smooth performance, and maintainable code that stays synchronized across both platforms. Let's connect to discuss your preferred Sabbath calculation method, notification behavior, and design preferences so we can define the MVP and development plan. Best regards, Nikita Gupta.
$300 USD in 22 days
5.8
5.8

Hello! We have previously developed cross-platform mobile applications, reminder apps, location-based solutions, countdown applications, and lifestyle platforms, and we can share relevant projects with you. We have 10+ years of experience in Full Stack Development with expertise in Flutter, React Native, GPS & location services, notification systems, API integrations, offline data management, cloud services, and mobile application development. We specialize in building clean, scalable, and high-performance mobile applications with seamless user experiences. Key Expertise: • Flutter / React Native Development • Cross-Platform Mobile Apps • GPS & Timezone Integration • Sunset API Integration • Push Notification Systems • Countdown Timer Development • Offline Data Management • Local Database Integration • Clean UI/UX Development • App Store & Play Store Deployment • API Integration • Mobile Performance Optimization We can build a calm, user-friendly Sabbath Timer app for iOS and Android with automatic sunset detection, customizable Sabbath duration, lock-screen reminder notifications, live countdown timer, offline Bible verse support, and a clean, minimal interface ready for App Store and Google Play submission. Thank you, Invoke Tech
$500 USD in 7 days
5.6
5.6

hi, i have experience building cross platform mobile apps using react native and flutter with clean ui and reliable notification systems. i can build your app with accurate sunset calculation based on location, local timezone support, countdown timer, offline verse storage, and a calm minimal interface for both ios and android. i will also make sure reminder notifications work properly even when the device is locked while respecting system settings like do not disturb. the code will be shared in a clean shared codebase so updates stay synced on both platforms. can we schedule a quick meeting to discuss the project in detail. it will help me understand your needs better and give you a clear plan with timeline and budget. i will also share my portfolio during the chat. thanks mughiraa
$500 USD in 7 days
5.2
5.2

Hi, Do you already have Apple Developer and Google Play accounts active, or will those need to be created before store submission? And have you decided whether the verse bundle will be baked into the initial release or updatable over the air, since that determines whether adding new scripture requires a full app update or a quiet background sync? One thing worth flagging early: iOS handles locked-screen notifications strictly. Local notifications respect the system DND setting and cannot pierce it, while Android gives more flexibility through notification channels. On a recent cross-platform reminder app I documented the exact per-platform behavior and worked it into the App Store description so users arrived with accurate expectations, which kept the early reviews clean and avoided the support volume that usually follows a misunderstood feature. Best regards.
$460 USD in 7 days
5.0
5.0

⭐⭐⭐⭐⭐ Create a Calm Mobile App to Mark the Sabbath Anywhere in the World ❇️ Hi My Friend, I hope you are doing well. I’ve reviewed your project requirements and see you are looking for a mobile app to mark the Sabbath. You don't need to look any further; Zohaib is here to help you! My team has completed 50+ similar projects for mobile apps. I will use React Native or Flutter to create a user-friendly app that detects local sunset times, sends gentle reminders, and displays Biblical verses. ➡️ Why Me? I have over 5 years of experience in mobile app development, focusing on creating user-friendly interfaces and efficient backend systems. My expertise includes GPS integration, countdown timers, and notification systems. I am also skilled in ensuring apps comply with user settings like Do Not Disturb, providing a seamless experience. ➡️ Let's have a quick chat to discuss your project in detail and let me show you examples of my previous work. Looking forward to discussing this with you in chat! ➡️ Skills & Experience: ✅ Mobile App Development ✅ React Native ✅ Flutter ✅ GPS Integration ✅ Countdown Timers ✅ API Integration ✅ User Interface Design ✅ Notification Systems ✅ Cross-Platform Development ✅ Source Code Management ✅ Minimal UI Design ✅ Problem Solving Waiting for your response! Best Regards, Zohaib
$350 USD in 2 days
5.2
5.2

As someone with over 6 years of deep experience in Android and Flutter app development, I understand the importance of building high-performance, scalable, and user-friendly mobile apps in the most efficient manner possible. Your Global Sabbath Timer App is particularly compelling to me as it aligns deeply with my skills. My notable strengths include strong API integration, Firebase features, and particularly authentication & real-time features which are crucial for your app’s reminder and countdown functionality. Moreover, my experience in payments, subscriptions, and in-app purchases will ensure that any optional weekday customization options you want for your app will be smoothly implemented, if required. With your requested preference for a shared codebase using React Native or Flutter to ensure updates stay synchronized, I can guarantee that your Global Sabbath Timer App would not only be robust but also easy to maintain in the long run. What sets me apart is my commitment to clean UI/UX. I am mindful of minimalism’s power to create calming aesthetics— perfect for an app like yours. As a freelancer, my focus is not only on delivering an excellent end-product but also ensuring clear communication throughout the process and providing long-standing support after project delivery. I would love to work with you on this noble project that merges modern technology and tradition flawlessly. Rest assured, your idea will be treated with great respect and delivered on time!
$700 USD in 25 days
5.0
5.0

I can develop a cross-platform mobile app for iOS and Android with automatic Sabbath tracking based on local sunset times, customizable duration settings, reminder notifications, a live countdown timer, and offline Biblical verse display in a calm, easy-to-use interface. The app will be built with a shared codebase for simple maintenance, delivered with source code, setup documentation and store-ready builds. Regards, Shawana
$250 USD in 15 days
4.6
4.6

Hello, Your vision resonates with me, and I’d love to help bring it to life. I can develop a polished Flutter app for both iOS and Android with accurate worldwide Sabbath timing, local sunset detection (GPS/manual timezone), lock-screen reminders that respect system settings, a live countdown, offline Scripture support, and a calm, distraction-free UI. I’ll deliver clean, well-documented source code, store-ready builds, and provide support through deployment. A quick question: would you like the sunset calculations to work fully offline, or would you prefer an API with offline fallback for maximum accuracy? I look forward to working together on this meaningful project. Thanks
$500 USD in 7 days
4.7
4.7

Hi, I can build your calm, respectful Sabbath reminder app for both iOS and Android using a shared codebase like Flutter or React Native. I’ll implement local sunset detection through GPS/manual timezone, Friday–Saturday or Friday–Sunday duration options, lock-screen-friendly notifications without overriding Do Not Disturb, a live countdown, offline verse display, clean minimal UI, store-ready builds, and clear setup notes for future maintenance. Best regards, Muhammad Jibran Ahmed
$1,000 USD in 5 days
4.3
4.3

Hi, I'd love to help build your Sabbath reminder app with a clean, peaceful, and user-friendly experience for both iOS and Android. I recommend Flutter for a single codebase, ensuring consistent performance and easier future maintenance. The app will accurately calculate local sunset using GPS or manual location/timezone, send respectful reminder notifications (without overriding Do Not Disturb), display a live Sabbath countdown, support the optional Friday–Sunday mode, and show offline Biblical verses once the Sabbath ends. I'll deliver a minimal, polished UI, well-structured source code, and release-ready builds for both app stores. I'm ready to start immediately and can move quickly from prototype to final submission. Let's discuss the flow and assets in chat so we can bring your vision to life efficiently.
$400 USD in 5 days
4.6
4.6

Hello, I'd love to help bring your Sabbath app to life. The concept is simple, meaningful, and well suited to a clean, cross-platform mobile application that prioritizes reliability, privacy, and a peaceful user experience. I recommend building the app with **Flutter**, allowing us to maintain a single codebase while delivering native-quality performance on both iOS and Android. The interface will be intentionally minimal, fast, and distraction-free, keeping the focus on the Sabbath experience. ### Proposed Features * Automatic Sabbath start and end based on the user's location and local sunset calculations * GPS location with manual timezone/location selection as a fallback * Optional Sabbath duration setting: * Friday sunset → Saturday sunset * Friday sunset → Sunday sunset * Local notifications that appear even when the device is locked (while fully respecting the user's existing Do Not Disturb settings) * Live countdown timer showing the remaining Sabbath time * Offline Scripture library with randomly or sequentially displayed verses at the conclusion * Elegant, calming UI designed for both light and dark modes * Fully responsive experience across phones and tablets I appreciate the thoughtful purpose behind this project and would be happy to collaborate closely to ensure the final app is polished, reliable, and ready for a smooth App Store and Google Play release. I look forward to discussing the flow and getting started.
$500 USD in 7 days
4.1
4.1

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