Everything we offer is part of one job: building mobile apps that people use, and keeping them working. We specialise in Flutter, which lets one code base serve Android and iOS, and we cover the whole lifecycle from UI/UX and MVP to backend, store deployment and maintenance.
Services are what we build for clients. Our own apps are listed separately under Products, and how we built them under Work.
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.
See how we build mobile apps, from idea to app storeHow the app is built and where it runs.
We build production Flutter apps: one Dart code base, compiled to native code, with an architecture chosen for the app's complexity. Every app CarrySo has published on Google Play is built with Flutter.
We build Android apps with Flutter and publish them on Google Play. CarrySo's own apps support Android 7.0 and later and are released, updated and monitored by us, so Play Console, Data safety forms and policy updates are routine work for our team.
We build iOS apps with Flutter, so the same code base that runs on Android also ships to iPhone and iPad through the App Store. An iOS project with us includes Apple Developer Program setup, iOS device testing, TestFlight builds and App Store review. Our published portfolio is currently on Google Play, and every one of those apps is built to run on iOS from the same code.
Cross-platform app development means shipping the same app to Android and iOS without writing it twice. We do it with Flutter: one Dart code base, compiled to native code on both platforms, with the UI, business logic and tests shared. All of CarrySo's published apps are built this way.
What kind of app you are launching.
An MVP (minimum viable product) is the smallest version of your app that real users can install and get value from. We build MVPs in Flutter so the same code can grow into the full product, not a prototype you throw away.
We build mobile applications for SaaS businesses, and we build mobile-first SaaS products from MVP to production. A SaaS mobile app with us means a Flutter app for Android and iOS with authentication, onboarding, user accounts, dashboards, subscriptions and payments, push notifications, an API-backed backend, analytics and an admin panel, plus store deployment and maintenance after launch.
We build AI-powered mobile apps in two ways: on-device models that run privately on the phone, which is how our own apps remove photo backgrounds and analyse media, and LLM-backed features that call hosted models through a secure backend. Both ship inside Flutter apps for Android and iOS with Firebase behind them.
The work around the code: design, backend, release and upkeep.
App maintenance keeps a published app working, compliant and improving after launch. That means fixing crashes, updating Flutter and SDK versions, meeting new Google Play requirements and shipping regular releases. We maintain our own portfolio of Flutter apps this way.
We design the flows and screens of a mobile app before we build them, then implement the design as a Flutter theme and component set rather than a static mock-up. The result is an interface that follows Material on Android, feels right on iOS, and stays consistent as the app grows.
We build the backend a mobile app needs and nothing more: Firebase services for auth, data, files, push and serverless logic, or integration with the API you already run. We also build the admin panels and remote configuration that let you operate the app after launch. Our own apps and internal tools run on this stack.
Publishing is a project stage of its own, with its own rules and rejections. We prepare the store listings, screenshots, privacy policy, Google Play Data safety form and App Store privacy labels, signed release builds and review responses, then run a staged rollout. We publish and update our own apps on Google Play, so this is routine work for us.
When an app was built by someone else and is now crashing, rejected by the store, unmaintained or impossible to extend, we audit it, stabilise it and take over its development. We start with facts, not a rewrite: an honest report on the code, dependencies, crashes and store status, then a plan that fixes what is urgent first.
Tell us what you want to build. We'll reply by email with questions, and then with a proposed scope and estimate.
