Skip to main content
Every successful Build or edit runs an agent that writes real code and saves it as a git commit. Mythos keeps each project in a private repository and builds it commit by commit. A new project scaffolds a whole app from your description; an edit changes the app you already have — each result is committed source you can publish or open in the editor. Connect your GitHub account and Mythos creates a new private repository you own, then keeps one selected active branch in two-way sync. For a Build or edit prompt, the mental model is one prompt → one agent run → one commit. A new build and an edit use the same pipeline; they differ only in what the agent starts from. Plan turns are the separate read-only planning flow described below and do not write code or Git history.
Cost: building a new project costs 3 credits; an edit costs 2. New accounts start with 5 free credits, and a failed build is refunded in full. See Credits & pricing.
Build mode vs Plan mode. In Build mode Mythos builds straight from your prompt. In Plan mode it asks focused questions and saves an editable plan draft for approval before writing any code. Each accepted Plan AI turn costs 1 credit after its response is saved; a failed turn is refunded, and the Build after approval is charged separately. Toggle the mode next to the composer.

​
Why it works this way

  • Real output, not a demo. Each build is committed code in a private repo, so you can keep iterating, publish it, or take it with you.
  • Edits are cheap and incremental. Changing an existing project costs less than a fresh build and only touches the files that need to change.
  • A failed build costs nothing. If a generation can’t deliver, you get a plain message and a full refund — you are never charged for a result you didn’t get.

​
How a build runs

1

Describe what you want

Type your prompt in the composer. For a new project, describe the app — its sections, tone, and any data it should handle. For an edit, describe the change.
2

Mythos seeds the workspace

A new build starts from the React 19 + Vite starter. An edit starts from your project’s current files. Either way the agent gets a working file tree to build on.
3

The agent writes code

The agent reads, writes, and edits files to satisfy your prompt. The live progress card shows it working — this is the step that takes real time.
4

The result is committed

When the agent finishes, the changed files are committed to your project’s repo and the preview updates. A new build is one commit on a fresh repo; an edit is a new commit on top of your history.

​
The live progress card

While a build runs, a card in the chat shows live progress so you know it’s working rather than stuck. A generation always reaches exactly one of two ends — a delivered result or a clean refund.
The technical reason for a failure is recorded for support, but the message you see stays plain and human. You never see a raw error string in the chat.

​
New project vs edit

​
Example prompts

A clear first prompt for a new project:
An edit prompt on an existing project:
Describe the sections, tone, and any data model in your first prompt. Getting there in one build instead of three saves credits. See Writing good prompts.

​
Limitations & good to know

  • In Build mode Mythos builds from your prompt and only asks a clarifying question if the brief is genuinely ambiguous. If you want focused questions and an editable plan draft up front, use Plan mode.
  • Edits apply to the project’s current state. To change something, edit the latest version, not an older one — though you can always revert to an earlier version first.
  • A run has a time budget. If it can’t finish in time, Mythos tries to salvage a complete result; if it still can’t deliver, you get a clean refund rather than a half-built app.
  • Mythos builds frontend apps. To save form submissions or other data, connect your own Supabase backend.

​
Troubleshooting

​
FAQ

A build creates a new project from a starter template (3 credits). An edit changes an existing project (2 credits). Both end in a git commit.
Yes. Every build and edit is a real git commit in the project’s private repository — not a throwaway preview. Connect your GitHub account and Mythos creates a new private repository you own, then keeps one selected active branch in two-way sync.
You get a plain message and a full refund. You are only ever charged for a build that delivers a result.
Use Build mode to build directly. Use Plan mode when you want focused questions and an editable plan draft before code is written. Each accepted Plan AI turn costs 1 credit; the Build is charged separately.
Usually a few minutes — a fresh scaffold is the slowest. The live progress card shows it working the whole time.