Simple Dual-Platform Sum Calculator

@Microlent

Hello, I am Dr. Rajesh Rolen, PhD in Computer Science & Engineering, with experience of over 20+ years in Android, Android App Development, Flutter, iOS Development, Mobile App Development, React Native, iPhone As a preferred freelancer in the top 1%, I have done 400+ projects here on freelancer.com, I have 4.9 ratings out of 5 on average, which showcases my quality of work and timely delivery. Key Highlights: - Free Hosting Support on the Cloud or any desired platform. - Free 3 months of post-delivery support to ensure that our client doesn’t face any challenges after the launch of the project. - Free Dedicated tester on projects to ensure quality delivery, so clients don’t need to act as a tester. - 10+ Years experience UI/UX team to ensure intuitive UI. Portfolio: https://www.freelancer.com/u/Microlent Please open the chat and send me a message, so we can have a more detailed discussion about the project to give you the project timeline and cost. Thank you for considering my services. I look forward to engaging in a productive conversation and understanding how I can be of assistance in bringing your project to life. Regards Rajesh Rolen

@shubhamshrimal7

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 sum calculator 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

@C0RETECHIES

Hi, You need a lightweight, dual-platform utility application that accepts two numerical inputs, computes their sum, and saves the result in a local historical log that persists across application restarts. Technical approach: - Framework: Flutter for a unified, high-performance Android and iOS codebase. - Persistence: Hive (NoSQL) or SharedPreferences for synchronous, lightweight local storage. - UI Architecture: Responsive text controllers restricted to numeric inputs, paired with a scrollable list view for chronological history. - Deliverables: Compiled AAB/APK and IPA, plus heavily commented source code with a build README. Core modules: - Input Validation: Restricting text fields to valid numeric/decimal formats to prevent crash states. - Calculation & Storage Engine: Instant sum generation followed by an immediate write operation to local storage. - Lifecycle Manager: Ensuring history retrieval triggers seamlessly during app initialization. Relevant systems: - Digital Jaap Lite (Utility tracking with local session persistence) - Digital Tasbeeh (Offline-first utility with local state management) Implementation strategy: I will start by drafting the UI and calculation logic. Next, I will implement the storage layer and validate persistence across forced app closures. Finally, I will package the builds and document the source instructions. Regards, Rohit

@c0909h1179

The real work here isn't the addition — it's making the history survive app restarts reliably on both platforms and producing store-ready builds that pass Apple and Google review. I've shipped 80+ apps since 2008 across Flutter, React Native, iOS and Android, including App Store/Google Play delivery and TestFlight distribution, so the packaging side is routine for me. My approach: (1) build in Flutter with a single clean screen — two numeric fields, a sum button, scrollable history; (2) persist entries locally via SQLite/shared preferences and verify persistence across cold restarts on a real iPhone and Android device; (3) deliver AAB, IPA, commented source and a short rebuild README. Do you already have Apple Developer and Play Console accounts set up?

@Hammadhassan21

Hello there i can give you my previous work of calculator apps, I can build this lightweight calculator app for both Android and iOS using Flutter, keeping everything in a single codebase. The app will include two number fields, instant sum calculation, a clean responsive layout and local calculation history that remains available after closing and reopening the app. I will also provide the build ready Android and iOS packages, complete source code and a simple README with rebuild instructions. I will test the local history and calculation flow on both platforms before delivery. I can keep the implementation simple and focused so the app can be completed quickly without unnecessary features. Portfolio: https://www.freelancer.com/u/Hammadhassan21 Could you confirm if you already have Apple Developer and Google Play developer accounts available for the final builds? Best regards, Hammad Hassan

@OutsourceMan

Hi, CnEL India can build your lightweight dual-platform calculator using React Native, with local calculation history and clean, responsive UI. Our methodology: * Define the simple calculation and history workflow. * Build a clean React Native interface for Android and iOS. * Add two responsive number input fields and an instant Sum action. * Validate numeric inputs and handle empty or invalid values clearly. * Calculate and display the result immediately. * Store calculation history locally so previous results remain available after app restart. * Keep the storage layer simple and reliable for this lightweight utility. * Use reusable components and clean, commented code. * Test calculation accuracy, history saving/loading and edge cases. * Verify persistence after closing and relaunching the app on both platforms. * Test responsive layouts and interactions across representative Android/iOS devices. * Prepare build-ready Android and iOS packages. * Provide complete source code and a concise README with rebuild instructions. * Support final bug fixes and release preparation as agreed. We would first finalize the small UI and storage flow, then implement the calculator and history, followed by cross-platform testing and build delivery.

@mninfotech2

Hi, I can develop your lightweight calculator app for both Android and iOS using **Flutter**, providing a single, clean, and maintainable codebase with a fast and responsive user experience. The app will include: * Two responsive input fields for entering numbers * A simple button to calculate the sum instantly * A clear results area with accurate calculations * Local calculation history that remains saved after closing and reopening the app * A clean, modern interface optimized for both platforms * Local storage for persistent data without requiring a server * Build-ready Android APK/AAB and iOS IPA packages * Well-commented source code and a README with rebuild instructions I’ll test the calculation logic, input validation, and history persistence on both Android and iOS to ensure everything works as expected. I have completed similar projects and can share relevant live examples in chat for your review. **Estimated timeline:** 2–3 days, including development, testing, and build preparation. I can also assist with the App Store and Google Play submission requirements, if needed. Looking forward to getting started. Best regards

@mobiappsoftware

Hello, I will develop your DUAL PLATFORM SUM CALCULATOR 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

@melikatfz

Hey, the key detail is keeping the calculation history available after the app is fully closed and reopened on both Android and iOS. I’d use Flutter with local storage so the two-number input, instant sum, and past results work consistently from one codebase. The tricky part is verifying persistence across app restarts and preparing the correct build outputs for each platform. Do you already have Apple Developer and Google Play accounts ready, or is this delivery focused on build-ready packages and source code?

@vivekrl43

Dear client, I can provide you the app with your exact requirements with saving the result in local db, I have more than 10 years of exp in apps and web development.

@ixorawebmob

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: 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

@jitendras097

Simple Calculator App – Flutter Android & iOS ✨ Hello, I can build this lightweight calculator app with a clean, responsive interface and a single Flutter codebase for both Android and iOS. The calculation history will persist locally and remain available after closing and reopening the app. Key Features: ➜ Two responsive number input fields ➜ Instant addition with clear result display ➜ Persistent local calculation history ➜ Clean, modern mobile UI ➜ Single Flutter codebase for Android & iOS ➜ Build-ready APK/AAB and IPA packages Best Regards,

@a4logic

Hi, I can build this lightweight app for both **Android and iOS from a single codebase**. I recommend Flutter for a clean, fast, and easy-to-maintain solution. The app will include: - Two number input fields - Instant sum calculation - Clean, responsive interface - Local calculation history - History retained after closing/reopening the app - Input validation - Android APK/AAB build - iOS build-ready project/package - Complete commented source code - README with build instructions - Testing on both platforms **Fixed Price: $250 USD** **Timeline: 4–5 days** I’ll keep the implementation simple and lightweight without unnecessary dependencies or features, making it easy to maintain and publish. I’m available to start immediately.

@Arunmohan001

Hi, I can build this lightweight cross-platform calculator app using Flutter with a single shared codebase for Android and iOS. I’ll implement the two-number input, instant addition, clean responsive UI, and a local calculation history that persists after closing and reopening the app. I’ll use reliable local storage so the calculation history works offline and remains available across app launches on both platforms. You’ll receive build-ready Android APK/AAB and iOS build output, complete source code, clear comments, and a concise README with rebuild instructions. I’ll thoroughly test the calculation, persistence, and responsive UI before delivery to ensure the app is ready for store submission.

@zainalitariq245

Hi i understand this is a calculator app should feel instant, reliable and effortless and i can build exactly that while keeping one clean codebase for both Android and iOS. I’d use Flutter or React Native to create the two number inputs, instant sum calculation, and a lightweight local history that persists even after the app is closed and reopened. I’ve built lightweight mobile utilities and can deliver the complete source code with clear comments, a short rebuild README, and build ready Android and iOS packages. I’ll also test the calculation history across both platforms to make sure saved results persist correctly through app restarts. Would you prefer Flutter for this project, or are you open to whichever cross platform approach gives the fastest clean delivery?? Looking forward to collaborating with you. MyPortfolio:, https://www.freelancer.pk/u/zainalitariq245 Best regards, Zain A..

@Jennycreation

Hello Sir, I have already worked on similar types of website and software development projects and I am confident that I can successfully handle your project. I am a full-time freelancer with **17+ years of experience** in web development, software development, automation, and API integrations. My expertise includes: * Android app development * ASP.NET C# web and software development * Python automation and web scraping (Amazon, Instagram, Facebook, Google Maps, LinkedIn, Telegram, and other custom scraping solutions) * JavaScript, jQuery, AJAX, Bootstrap, HTML5 * Microsoft SQL Server database development * Payment gateway integration * SMS, Email, Banking, Financial, and Insurance API integration * Custom automation bots and workflow automation software I focus on delivering **high-quality, scalable, and reliable solutions** with clean code and long-term support. Please contact me in private chat so we can discuss your requirements in detail. I can also show you a **demo of similar projects** I have completed. Looking forward to working with you. Thanks & Regards

@ravichedwal

With my broad range of skills in mobile app development and over 8 years of industry experience, I am confident in my ability to deliver a top-notch, cross-platform solution for your Simple Dual-Platform Sum Calculator. While I am proficient in Flutter and React Native, I'm also open to any other toolkit that meets your specific needs and adheres to Apple App Store and Google Play requirements. In terms of your project's fundamental necessities, I know how to build an app that allows users to enter numbers, perform calculations, and view their calculation history. Additionally, my meticulous approach ensures the accurate persistence of sums even when the app is closed and relaunched on both iOS and Android platforms.

@Beannsofts

You need a dual-platform sum calculator that stores a running history locally and ships with build-ready packages for both Android and iOS. I would use Flutter for this because it compiles to native code for both platforms from a single codebase and handles local persistence cleanly with the sqflite or hive packages. The UI would have two numeric input fields, an add button, a result display, and a scrollable history list that loads every time the app launches. The workflow is straightforward: validate the inputs, perform the addition, save the result with a timestamp to local storage, and refresh the history view. I would deliver commented Dart source code, a README with rebuild instructions, and signed APK, AAB, and IPA files ready for store submission. I have shipped production apps and trading platforms with real-time data and persistent state, and my track record on Freelancer is 4.99 out of 5 from 149 reviews across 143 completed projects, 99.5 percent on time and 99.8 percent on budget. Do you want the history sorted newest-first or oldest-first, and should there be a way to clear it, or will it grow indefinitely? Let's talk and get started. Thank you.

@Sohailzk

Hi, I can build this simple calculator app in Flutter for both Android and iOS from a single codebase. I’ll add the two-number input, instant sum calculation, and local history so previous calculations remain available after closing and reopening the app. I’ll provide the source code, Android and iOS build files, and a simple README with build instructions. Thank you.