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Common questions about Mythos, grouped by theme. Each answer links to the page that covers it in full.
Cost basics: new accounts get 5 free credits. Each accepted Plan AI turn costs 1 credit, a new project costs 3, an edit costs 2, and a template remix costs 5. Failed Plan turns and failed Builds are refunded. Credits are pay-as-you-go and never expire. See Credits & pricing.

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Building

Mythos turns a plain-language prompt into a real, running React + Vite web app, with the code committed to a private managed repository. You can also connect your GitHub account; Mythos then creates a new private repository you own and keeps one selected active branch in two-way sync. You iterate by chatting with Mythos or by editing the code in the workspace.
No. You can build and iterate entirely in chat. The code editor is there when you want precise control, but it’s optional.
React 19 with Vite 7 and Tailwind CSS. Mythos owns the working scaffold so you can start with the product instead of framework setup.
Build mode goes straight to writing code. Plan mode asks focused questions and saves an editable plan draft you approve before any code is written. Each accepted Plan AI turn costs 1 credit after its response is saved; failed turns are refunded, and the Build is charged separately. See Plan mode.
Usually a minute or two for a single page. A Plan session completes before its separately charged Build begins.
You get a clean message and a full refund — you’re only charged when a result is delivered. Re-prompt at no cost.
Yes. Reverting restores an earlier version as a new commit, so your history is never destroyed.

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Credits & billing

Each accepted Plan AI turn is 1 credit, a new project is 3, an edit is 2, and a template remix is 5. Failed Plan turns and failed Builds are refunded. New accounts start with 5 free credits.
No. Mythos is entirely pay-as-you-go. You buy credit packs once and spend them at your own pace — no monthly fee and no monthly reset.
No. Credits never expire and sit in your account until you use them.
Pro is 100 credits for 30(30 (0.30 each); Ultra is 1,000 credits for 270(270 (0.27 each — 10% off the Pro rate). See Credits & pricing.
Choose USDT on TON, USDT on Solana, or USDC on Solana. One universal invoice works with a compatible wallet or exchange and shows the receive address, exact amount, and QR. For TON, use the receive address shown by Mythos and do not add a memo or comment; Solana payment links include an invoice reference.
No. Every generation ends in exactly one of two outcomes: a delivered result, or a clean message plus a full refund. You are only charged for a build that delivers.
When someone you referred makes their first top-up of $30 or more, you receive 50 credits — one reward per referred person.

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Backend & data

No. Mythos builds the frontend. For a database, auth, and file storage you connect your own Supabase project, and the agent wires forms and data into it. Your data stays in your account.
So your database, your users, and your credentials live in your own account — not in Mythos. Mythos only sees the connection details it needs to build against your project.
Open More → Cloud, connect your Supabase account, then choose an organization and an existing project or create one explicitly. You never need to copy project keys. If a build requested Supabase, it resumes automatically after the connection is ready.
Yes — once you connect your Supabase. The agent can wire auth and write forms to real tables in your database. Without a connected backend, a form is frontend-only.

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Publishing

Publish it to a live *.r21.dev URL from the workspace. You can add a custom domain later. See Publishing.
Yes. Publishing makes your site public on the internet — anyone with the URL can open it. Review the page before you publish, and make sure no private keys are in the frontend.
Yes. Keep building and editing in the workspace, then publish again to update the live site.

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Your code & ownership

Mythos builds it in a private managed repository, where every Build and edit is a real commit. Connect your GitHub account and Mythos creates a new private repository you own, then keeps one selected active branch in two-way sync.
Yes — the output is real code, not a locked-in template, and it is yours to take. You can read it, edit it in the workspace, and connect your GitHub account so Mythos creates a new private repository you own with two-way sync on one selected active branch.
Yes. The workspace has a code editor for direct, precise changes, alongside chat-based editing. The editor is desktop-only.
With Google, GitHub, or a one-time code sent to your email — no passwords. See Signing in.