Mobile apps for iOS and Android
One codebase that still follows each platform’s conventions, from navigation to dark mode and accessibility.
Flutter app development
iOS, Android and web from one Flutter codebase, built with AI.
We build Flutter apps from the first prototype to the App Store and Google Play, and keep them growing after launch. AI drafts the code; senior engineers review it, test on real devices and own every release. Mobile since 2013, Flutter since 2021.
One codebase, every screenDart end to end
- iOSApp Store · TestFlight
- AndroidGoogle Play · Internal Testing
- WebFlutter Web · admin panels
- BackendServerpod · Go · Node.js · PHP
What we build
The app, the web version and what runs behind them.
Flutter Web and admin panels
Customer web apps and internal admin panels that share code and components with the mobile app.
Full-stack Dart with Serverpod
A type-safe Dart backend with models shared by app and server — or Go, Node.js and PHP where they fit better.
Plugins for native SDKs
When a native SDK has no Flutter plugin, we write one, and open-source it when we can.
AI-native Flutter
AI writes the first draft. People ship the app.
We build Flutter apps with AI, mainly Claude. That makes us fast; review, tests and real devices make the result reliable.
Senior review on every change
AI drafts code and tests. A senior engineer reads every change before it is merged.
Tests at three levels
Unit tests for logic, widget tests for the UI and integration tests for critical flows, run in CI.
Real devices, not just simulators
Older iPhones, low-end Android phones, small and large screens.
Weekly builds you can install
TestFlight and Internal Testing every week, with a short changelog.
Store launch handled
Metadata, screenshots, privacy details and the review conversations with Apple and Google.
Crash reports from day one
Crashlytics and analytics in the first build, so decisions after launch rest on real data.
How we work
From idea to both stores.
The smallest version that proves the idea first. An MVP shipped in two months beats an eight-month project that never sees daylight.
- 01 · Discover
Map the product
Goals, audience and constraints; must-haves separated from nice-to-haves.
- 02 · Design
Prototype before code
Wireframes and a clickable prototype you can try before we write the app.
- 03 · Build
Develop with AI
One codebase, weekly builds on TestFlight and Internal Testing.
- 04 · Test
Real devices, real flows
Automated tests in CI plus manual testing on real phones, reviewed by a senior engineer.
- 05 · Launch
Ship and grow
Store submission, then new versions driven by feedback and telemetry.
Flutter or native?
We’ll tell you when Flutter is not the answer.
| Choose Flutter when | Choose native when | |
|---|---|---|
| Platforms | The same product ships on iOS, Android and maybe web | You only target one platform |
| Design | Your brand should look the same everywhere | The app must follow one platform’s UI to the letter |
| Device features | Standard features, or SDKs that can be wrapped as plugins | Deep OS integration is the core of the product |
| Team | One team should own every platform | You already run strong iOS and Android teams |
| Releases | Features should land on both platforms together | Each platform can move at its own pace |
Proof
Flutter apps in users’ hands.
Table Online
Real-time multiplayer backgammon on iOS, Android and web: game, admin panel and Serverpod backend in Dart.
See Table Online →WeReload
An eSIM app for travelers: data plans in over 190 countries, activated from the phone. Flutter on iOS and Android.
Read the case study →SWV Wien
A members’ app for a Vienna organization: news, events and members-only chat. Flutter on iOS and Android.
Read the case study → Testimonials
What our clients say about us
We have worked with Alex, CEO of Tagonsoft, and his team first as consultants after that as developers of our iOS App for over a year. It proved to be a valuable support throughout the development of the App before being taken in hand by our internal team. Alex and his team are totally reliable, serious and honest, rare qualities to find in this field. Cynny is grateful for the contribution and the availability in every critical moment.
Tagonsoft is the company to partner with when it comes to mobile development. They take the time to understand your requirements, budget and expectations. The solution that was developed for Planbox was high quality and the Tagonsoft team has been very easy to work with before, during and after our mobile app was delivered and deployed.
We needed to redesign a tool that contained speech synthesis and speech recognition functionality. TAGonSoft did a very good job and delivered a great and stable app for iTunes.
On pub.dev
We give back to the Flutter ecosystem with open source packages
Building Flutter apps puts us in front of real problems. When the right package is missing, we write it, publish it on pub.dev under our verified tagonsoft.com publisher, and let the whole Flutter community use it.
Verified publisher: tagonsoft.com portsip v0.2.1
5 150 175
Flutter plugin for the PortSIP VoIP SDK
A Flutter wrapper around the PortSIP VoIP SDK — SIP calling, call controls (hold, mute, DTMF, loudspeaker), CallKit on iOS and ConnectionService on Android, SRTP encryption, OPUS/G.722/G.729 codecs.
· We built it for a client telephony app. No Flutter plugin existed for PortSIP, so we shipped one — and open-sourced it so nobody else has to start from scratch.
- iOS
- Android
groq v1.1.1
18 160 192
Dart SDK for the Groq AI API — blazing-fast LLM inference
✓ Listed in Groq's official documentation
A clean, idiomatic Groq API integration for Dart and Flutter. Multi-model support (Llama 3, Qwen, GPT-OSS), temperature/seed config, custom system instructions, chat session management, typed error handling.
· First used to add smart search across the product catalog in the WeReload app — the user types what they want in natural language, Groq returns matching results in under a second.
- iOS
- Android
- web
- Windows
- macOS
- Linux
FAQ
Flutter development, answered.
Why Flutter instead of two native apps?
One codebase means features ship on iOS and Android together and cost less to build and maintain. Flutter renders at native speed, and native SDKs remain usable through plugins.
Is Flutter a good choice for the web?
For web apps and admin panels, yes: the Table Online and ParsePrime web apps both run on Flutter Web. For content sites that live on search traffic, a classic web stack is the better choice.
How do you use AI when building Flutter apps?
AI, mainly Claude, drafts code, tests and documentation. Senior engineers set the architecture, review every change and test on real devices before each release.
We already have native apps. Can we move to Flutter?
Yes, step by step and without a big-bang rewrite: Flutter screens run inside your native apps until the migration is done. See our native → Flutter migration page.
Do you publish the apps to the App Store and Google Play?
Yes. We prepare the store listings and privacy details, submit the builds and handle the review conversations with Apple and Google.
Who owns the code?
You do. All code, designs, tests and documentation belong to you and stay with you after the engagement ends.
Have an app idea? Let’s ship it on both stores.
Tell us what you want to build. We come back with a proposed scope, timeline and cost.