AppStack is a boutique mobile studio specializing in Flutter and native iOS, with Firebase as a full-stack backend. From MVP to regulated healthcare software, we deliver production apps end-to-end.
One codebase, iOS and Android. Production Flutter apps built with Clean Architecture and BLoC — testable, maintainable, fast to evolve.
Auth, Firestore, Cloud Functions, push, analytics, hosting. We own the backend so you get features end-to-end, not just screens.
Swift, UIKit, Core Data, Bluetooth, AVFoundation. A decade of native iOS for when the platform demands it — or when Flutter needs deep interop.
We move aging native apps to Flutter without breaking production — including offline-first sync and hardware interop, proven in medical software.
From idea to App Store in weeks. A lean, scalable first version with the architecture to grow — not a throwaway prototype.
Migrated a medical wound-evaluation app from legacy iOS to Flutter, with offline-first sync and measurement-hardware interop.
A healthcare application for doctors to manage patient images and medical history. Built from the ground up in Flutter with Firebase as the full backend.
An iOS app that turns staying off your phone into a time-boxed commitment, backed by buddy-based accountability and native Screen Time integration.
A padel platform connecting players for matchmaking and court bookings, with tools for club owners. Built solo across iOS, Android, and web.
A new Flutter app bringing Christianity Today's web-only content to iOS and Android, built via the agency Fueled.
A QR-menu platform letting restaurants create, update, and manage menus with realtime sync across customer touchpoints.
Marius has spent 10+ years in mobile — shipping apps across healthcare, food, IoT, navigation, and social, from solo builds to large international agile teams. For the last three years he has specialized in Flutter, pairing it with Firebase to deliver features end-to-end.
Every AppStack project is led with Clean Architecture and BLoC, so the codebase stays testable and evolvable — and every engagement comes with direct access to the engineer writing the code.
Tell us about the scope and timing. We reply within one business day with an honest assessment and a quote.