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Mythos turns a plain-language description into a real, running web app. You type what you want — “a landing page for a moving company”, “a booking tool for my barbershop” — and Mythos scaffolds a production-shaped React 19 + Vite project, writes the components, and shows you a live preview in seconds. You keep iterating by chatting with it or by editing the code yourself in the built-in editor. It is a browser-based AI developer: the speed of a prompt, but the output is real code — not a locked-in template. Connect your GitHub account and Mythos creates a new private repository you own, then keeps one selected active branch in two-way sync.
Cost: new accounts start with 5 free credits. Building a new project costs 3 credits, an edit costs 2, and each accepted Plan AI turn costs 1. Failed Plan turns and failed Builds are refunded. Credits are pay-as-you-go and never expire — there are no monthly subscriptions. See Credits & pricing.

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Why Mythos

  • Real code, not a black box. Mythos keeps each project in a private repository and builds it commit by commit. Connect your GitHub account and Mythos creates a new private repository you own, with two-way sync on one selected active branch. You can read the code, edit it in the workspace IDE or GitHub, and take it with you while Mythos keeps its managed canonical build history.
  • Modern stack, decided for you. React 19 + Vite 7 with Tailwind CSS — current, conventional choices that look and behave like a project a developer would ship.
  • Iterate in plain language. Describe a change and Mythos makes it. Switch to the code editor when you want precise control.
  • Bring your own backend. Connect your own Supabase project for a database, auth, and storage — your data stays in your account.
  • Publish in a click. Ship to a live *.r21.dev URL, then point a custom domain at it.

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Who Mythos is for

  • Founders and indie builders shipping an MVP or a marketing site fast.
  • Designers and non-developers who want a real, editable site instead of a no-code lock-in.
  • Developers who want to skip the boilerplate and jump straight into a working scaffold.

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What you can build

Mythos is frontend-first: it excels at landing pages, marketing sites, dashboards, portfolios, and the UI of a SaaS or internal tool. Add a database and auth by connecting your own Supabase project, and the agent wires forms, tables, and login into it.
Mythos builds the frontend and wires it to a Supabase project in your account. Connect your Supabase account, then choose an existing project or create one from Cloud. Mythos retrieves the required project credentials server-side; you never paste keys, and the private service-role key is never exposed to the browser or the agent.

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How a Mythos project flows

1

Describe

Type what you want to build. Optionally turn on Plan mode for focused questions and an editable plan draft before code.
2

Build

Mythos scaffolds the project and streams a live preview. Each build is a real commit in the project’s private repository.
3

Iterate

Refine by chat (“make the hero darker”, “add a pricing section”) or edit the code directly in the workspace IDE.
4

Connect a backend

Connect your Supabase project to add a database, auth, and storage. The agent wires your forms and data into it.
5

Publish

Ship to a live URL and, when ready, connect a custom domain.

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Your code, your account

  • GitHub: Mythos builds each project in a private managed repository. Connect your GitHub account and Mythos creates a new private repository you own, then keeps one selected active branch in two-way sync.
  • Backend: you connect your own Supabase — your database and users live in your account, not ours.
  • Auth: sign in to Mythos with Google, GitHub, or an email code.

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Next steps

Signing in

Google, GitHub, or an email code — and your 5 free credits.

Quick start

Build and publish your first project in a few minutes.

Dashboard & workspace tour

The prompt box, the project tray, and the workspace.

Plan mode

Answer focused questions, edit and approve a plan draft, then start the separate Build.

Credits & pricing

How credits work, what actions cost, and the packs.

Writing good prompts

Get better results from your first prompt.