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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 (Vite) or Next.js 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 — that you can export to your own GitHub.
Cost: new accounts start with 5 free credits. Building a new project costs 3 credits, an edit costs 2. 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 once and export to your own GitHub anytime — you get a clean repository that is yours. You can read the code, edit it in the workspace IDE, and take it with you. (Mythos keeps its own internal build copy.)
  • Modern stack, decided for you. React 19 + Vite, or Next.js 16 (App Router), 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 your backend. It does not host a database for you or run server-side secrets on your behalf — anything needing a private server key (payments, transactional email) requires you to connect Supabase and supply those keys there. This keeps your data and credentials in your own account.

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How a Mythos project flows

1

Describe

Type what you want to build. Optionally turn on Plan mode to answer a few questions and pick a design first.
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 repository; connect GitHub once to export a clean copy that is yours.
  • 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 a few questions, pick from three designs, then build.

Credits & pricing

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

Writing good prompts

Get better results from your first prompt.