CarrySo is a mobile app development company specialising in Flutter and cross-platform apps. We build custom Android and iOS apps, SaaS mobile apps and MVPs for clients, and we develop and publish our own apps on Google Play, so every stage from idea to app store to maintenance is work we do every week.
One core service, mobile app development, and the specialisms within it. Each page explains what we build, how, and the evidence behind it.
CarrySo is a mobile app development company. We design, build, launch and maintain Android and iOS apps with Flutter, including SaaS mobile apps and MVPs, and we publish our own apps on Google Play, so we deal with the whole lifecycle ourselves, not only the build.
Explore mobile app developmentHow the app is built and where it runs.
Flutter app development for Android and cross-platform apps: architecture, state management, Firebase, on-device processing, testing and store release.
Android app development with Flutter: apps built for real devices, published and maintained on Google Play, with Data safety, privacy policies and updates.
iOS app development with Flutter: iPhone and iPad apps from one code base, Apple Developer setup, TestFlight, App Store review, privacy labels and updates.
Cross-platform mobile app development with Flutter: one code base for Android and iOS, native performance, shared tests, and lower build and maintenance cost.
What kind of app you are launching.
Launch a focused mobile MVP with Flutter: tight scope, real users on the app store, crash reporting and remote config, so you learn fast and iterate.
Mobile apps for SaaS businesses and mobile-first SaaS products in Flutter: subscriptions, auth, onboarding, dashboards, payments, push, APIs and admin panels.
AI app development for mobile: on-device models for photo, video and text tasks, plus LLM-powered features through APIs, built into Flutter apps with Firebase.
The work around the code: design, backend, release and upkeep.
Mobile app maintenance for Flutter apps: crash monitoring, SDK and target API updates, Google Play policy compliance, update prompts and regular releases.
Mobile app UI/UX design that ships: user flows, wireframes, screens and a Flutter design system for Android and iOS, with onboarding, dark mode and accessibility.
Backend and API development for mobile apps: Firebase (Auth, Firestore, Cloud Functions, FCM), REST API integration, security rules, admin panels and remote config.
App deployment to Google Play and the App Store: listings, screenshots, privacy policy, Data safety and privacy labels, signing, review, staged rollout and updates.
App rescue for Flutter apps: audit, stabilise and take over an existing mobile app, fix crashes and store issues, then add features on a sustainable footing.
Alongside client work, CarrySo develops and operates its own apps. These are our products, not client projects, and they are live on Google Play under the CarrySo developer account. Each has a case study explaining how it was built.
Compress photos to an exact size in KB, resize in batch and convert formats, all on the device.
Offline AI background removal with manual erase and restore tools and marketplace-ready exports.
Turn videos and photos into GIFs, edit frame by frame, and export GIF, MP4 or WebP without a watermark.
Batch convert iPhone HEIC photos to JPG, PNG, PDF or WebP offline, keeping EXIF data and dates.
Find and remove hidden GPS, device and software metadata from photos and videos before you share them.
A small, fast photo cropper with social media presets, rotation, straightening and full-resolution export.
Every project follows the same lifecycle we use for our own apps: from idea to store release, then maintenance and scaling.
You bring the problem, the audience and the business case. We ask what success looks like at launch and a year later.
A written scope: who the app is for, the core workflow, integrations, platforms and the release target. This is where most cost decisions are made.
User flows, wireframes and screens that follow Material on Android and feel native on iOS, designed as a Flutter theme rather than throwaway mock-ups.
The smallest version real users can install and rely on, built on the same architecture the full product will use.
Flutter build in short iterations with test builds on real Android and iOS devices, so you see a working app early.
Firebase or a REST API for accounts, sync, subscriptions, push notifications and an admin panel, added only where the product needs it.
Unit tests on parsers, repositories and controllers, widget tests, and release candidates checked on physical devices.
Store listings, screenshots, privacy policy, Data safety and privacy labels, signing, review and staged rollout on Google Play and the App Store.
Crash reporting, analytics and remote configuration are live from day one, so the first week's problems are visible and fixable.
Crash fixes, SDK and target API updates, store policy deadlines and regular releases, run the same way we run our own apps.
New features, more platforms, subscriptions and performance work as usage grows, without rebuilding the app.
Named because we use them in production apps and tooling, not to fill a logo wall.
See the backend and API page for how we use Firebase, and the 6 case studies for the stack behind each app.
Guides on mobile app development, Flutter, SaaS apps and MVPs, written from the work we do.
Flutter or native Kotlin and Swift? A practical comparison of cost, performance, UI, platform access and maintenance, with the cases where each wins.
What drives the cost of a mobile app: scope, backend, integrations, design, platforms and maintenance. How to estimate your app and what an honest quote includes.
A realistic MVP timeline for a mobile app: what fits in weeks, what pushes it to months, and how to scope a Flutter MVP that ships to real users fast.
We are a mobile app development company specialising in Flutter and cross-platform mobile applications. We build custom mobile apps, SaaS applications and MVPs for clients, while also developing and operating our own software products.
CarrySo has delivered 150+ projects for clients, alongside the 9 apps it publishes under its own name on Google Play.
Yes. Mobile app development is our core business. Every service we offer, from UI/UX design to backend APIs and app store deployment, exists to design, build, launch and maintain mobile apps.
Yes. Flutter is our primary technology, and every app CarrySo has published on Google Play is built with Flutter and Dart.
We build with Flutter, which compiles one code base for both Android and iOS. Our published apps are currently on Google Play. For iOS releases we add Apple Developer setup, iOS testing and App Store review to the project plan.
Yes. We build mobile apps for SaaS businesses, mobile-first SaaS products with subscriptions and backends, and focused MVPs that grow into full products.
Send a short description of your idea through the contact page or email carrysoofficial@gmail.com. We reply with questions, then a written scope and estimate.
Tell us what you want to build. We'll reply by email with questions, and then with a proposed scope and estimate.
