Belay Studio

Services · Web & mobile

Web and mobile app development

Full products, from the database to the app store. We write the tests and the requirements with the code.

Talk to an engineer See the proof

Web & mobile

What you can ask us for

Full-stack products, from the database to the app store.

Web applications

Fast interfaces with React and TypeScript. We render them on the server, in the browser or as static pages, as the product needs.

How we do it : Web applications

Method

How we work

  1. Requirements first

    We write the requirements, with their acceptance criteria, before the code.

  2. A plan before the code

    A person approves the plan. Then the code starts.

  3. Tests decide

    Automated tests decide if a change is ready.

  4. One team for the full product

    The same people build the interface, the API, the AI service and the infrastructure, so the parts fit together.

Tools

  • React
  • React Router
  • TypeScript
  • Tailwind CSS
  • Astro
  • Vite
  • Node.js
  • Hapi
  • Python
  • FastAPI
  • PostgreSQL
  • Redis
  • Flutter
  • Dart
The tools, and how we use them

Proof

Projects that show it

Each project has a page that says what the product does and what we built.

  • The vest101 home page: the headline “Dividend income, instrumented.” next to a portfolio panel with total value, deposits and return

    Fintech SaaS · AI research agents

    vest101

    Live

    A portfolio and dividend tracker with AI research agents. The agents propose, and the investor approves each move.

  • The BaseadosTV home page: the headline “The best grassroots football within your reach” next to a young player with a ball

    Live streaming & video on demand

    BaseadosTV

    Live

    Live and on-demand football for the clubs of the Region of Murcia, on a streaming platform that we built from the camera to the app.

  • Three screens of the BaseadosTV app on a phone: the video library, the home screen and the list of clubs

    iOS & Android app

    BaseadosTV Mobile

    Live

    The BaseadosTV app for iOS and Android: live matches, video on demand and in-app subscriptions.

  • The title screen of World of Kandrax: a pixel-art town at sunset below the name of the game

    Multiplayer browser RPG

    World of Kandrax

    Live

    A pixel-art online RPG. Belay Studio directs and designs the game, and AI agents write the code and the architecture with our technical direction.

  • The Mister Doku home page: the headline “Place the suspects. Unmask the culprit.” next to a pixel-art case board with suspects, zones and the magnifier

    Browser puzzle game · Case generator

    Mister Doku

    Live

    A mystery sudoku in the browser: read the clues, place the suspects and find the culprit. A new case each day.

  • A conversation in Osler: the assistant answers a question about breakfast with the lab values and the family history of the user, then looks for documents about a knee surgery

    Health AI assistant

    Osler·MD

    Live

    A personal medical assistant that reads your records and answers daily health questions with your own history in mind.

Questions

Questions about this service

Short answers, before you write to us.

Do you build the web app and the mobile app?

Yes. We build the web app with React and TypeScript, and the iOS and Android apps from one Flutter codebase. The apps use the same API as the web.

Can you add payments and subscriptions?

Yes. We build subscriptions, single payments and in-app purchases: Stripe on the web, and Apple and Google purchases in the apps.

How does a new product start?

From our own generator. On the first day, the product has sign-in, payments, database migrations, an AI service and end-to-end tests.

Do you need this?

Tell us what you want to build or fix. An engineer answers.

Contact us