DeveloperBrain
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App studio · source code included

A finished app,
and all the source code.
It's yours.

I design and build complete cross-platform apps, then hand over the whole codebase. You see a working demo first and own everything on delivery. Content is produced separately, only when you need it.

One codebase for iOS, Android and Web You own the source Demo before you commit
What you get

A shippable product, and the keys to it.

01

A complete app

A real, working application with navigation, logic, state and polish. Built to run in production.

02

The full source code

The entire codebase, cleanly organized and documented. Yours to keep and build on.

03

You own it, fully

No lock-in and no ongoing fees. The rights and the repository are handed over to you.

04

Live deployed demo

A hosted demo you can click through, so you judge the real thing before anything is finalized.

How it works

Three clear stages. You only pay for content when you actually need it.

The app and the content are kept separate on purpose, so you get a real product first and fill it with data on your own terms.

01 · DEMO

See it live, empty

I build a working demo of your app with placeholder content and deploy it. You click through the real flows before committing to the full build.

no content yet · risk-free look
02 · DELIVERY

App + source code

The complete app is delivered along with the entire codebase. Set up for iOS, Android and web from a single project. It's yours from this moment.

codebase handed over · you own it
03 · CONTENT

Content, priced separately

Questions, datasets, copy, translations and media, produced and wired into the app as an add-on service. Scoped and quoted per project.

extra · only if you want it
Selected work

Shipped products, not concepts.

CertOwl exam prep · 7 langs
Mobile app · iOS & Android

Certification exam-prep app

A full learning app: spaced-repetition engine, realistic exam simulations, streaks and leagues, offline-first, freemium with in-app purchases, and its own marketing site. Content in 7 languages.

React NativeExpoTypeScriptoffline-firsti18n ×7IAP
Web · Landing pages

Conversion landing pages

Fast, multilingual, self-hosted landing pages with waitlist capture and clean analytics. Built to convert and easy to run.

multilingualzero-depsRailway
Open slot

Your project here

Have something in mind? It could be the next one on this page.

Why this way

Built to be handed over.

You own the source

The full codebase is yours. Bring in any developer later, or take it in-house. Nothing is hidden.

Demo before commitment

You see a real, running version first, so you judge the product instead of a promise.

One codebase, every platform

iOS, Android and web from a single modern stack. No need to maintain three separate builds.

Content stays flexible

The app ships empty and ready. Add content when you're ready, priced only for what you need.

Production-grade, tested

Typed, linted and test-covered code that you can build a real business on.

Straight, quiet delivery

No agency overhead and no upsell. Just a clear scope, a working build, and the repository in your hands.

Let's build it

The best work starts with a good brief.

Tell me what you have in mind and I'll come back with a plan, a rough scope, and what a demo would look like. No obligation.

Prefer email? info@developerbrain.pro

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