Cross-platform app development with Flutter & React Native

Cross-platform app development with Flutter and React Native. One codebase ships the iPhone and Android apps together.

Work that usually takes three months, done within two weeks.

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Cross-platform apps we build

A cross-platform app is built from one codebase and ships on both iPhone and Android. Eigen builds cross-platform apps with Flutter and React Native.

The process is the same as for any app we build. A builder AI writes it, automated checks grade it, and a reviewer AI from a different company checks the evidence.

If you need apps tailored to each platform instead, we build native mobile apps too.

  • Flutter apps

    iPhone and Android apps from one Flutter codebase.

  • React Native apps

    iPhone and Android apps from one React Native codebase.

  • Admin tools for your app

    The web screens your team uses to run the service behind the app.

  • Ready to install

    At the end you get the app install file, all the source code, and the check records.

You do three things

Give us the idea, approve the plan, and try it yourself at the end. Eigen handles the rest.

  1. You

    Idea

    Send an idea, a spec, or designs. We tell you what is missing first.

  2. Planning AI, your approval

    Plan

    We write the task list, the order, and the acceptance criteria. You approve, and we start.

  3. Builder AI

    Build

    Tasks are built one by one. Tasks that don’t depend on each other are built at the same time.

  4. Automated checks

    Grade

    Code grades the work. If it fails, it goes back to the build.

  5. Reviewer AI, other company

    Review

    It looks only at the result and the evidence, then decides pass or fail.

  6. You

    Final check

    You try it and confirm. If something needs fixing, tell us right away.

Why you can trust the result

  • Done only when the automated checks pass

    Code checks whether the app builds, whether it follows the code rules, and whether the features work. One failure and the task can’t be marked complete.

  • The builder never grades its own work

    The reviewer AI is a model from a different company. It never sees the builder’s explanations, only the result and the evidence.

  • Your approved plan never changes behind your back

    The approved work plan is locked. If something has to change, we show you a new plan and ask for your approval again.

  • Follow progress on a live board

    Each task shows its status, the number of attempts, and the number of failing checks as they change. It’s there at night and on weekends too.

Frequently asked questions

Flutter or React Native: which do you use?

Both. If you haven’t decided, the planning AI asks it as a question and suggests a default with its reasons. You just choose.

Do you build native apps too?

Yes. We build native apps in Swift for iPhone and in Kotlin with Jetpack Compose for Android.

Do I need a spec?

No. An idea is enough to start. The planning AI turns the gaps into questions and suggests defaults.

How do I follow progress?

You get the address of your own live board. For each task, the status, the number of attempts, and the number of failing checks update at once.

What do I get at the end?

All the source code with a record for every task, the app install file, the check records, a final report, and a checklist of what you confirm yourself.

Planning one app for iPhone and Android?

Send us an idea or a spec. We start by sorting out what’s missing.

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