Cost basics: new accounts get 5 free credits. A new project costs 3 credits, an edit
costs 2, and a template remix costs 5. Credits are pay-as-you-go and never expire. See
Credits & pricing.
Building
What is Mythos?
What is Mythos?
Mythos turns a plain-language prompt into a real, running web app — a React (Vite) or Next.js project, with the code committed to a private repository you can export to your own GitHub. You iterate by chatting with it or by editing the code in the workspace.
Do I need to know how to code?
Do I need to know how to code?
No. You can build and iterate entirely in chat. The code editor is there when you want precise control, but it’s optional.
Which frameworks can it build?
Which frameworks can it build?
React with Vite, or Next.js (App Router) — both with Tailwind CSS. You pick the stack in the prompt box when starting a project.
What's the difference between Build and Plan mode?
What's the difference between Build and Plan mode?
Build mode goes straight to writing code. Plan mode first asks a few questions, shows two to four design directions to choose from, and presents a plan you approve before any code is written. Planning is free; you only spend credits on the build. See Plan mode.
How long does a build take?
How long does a build take?
Usually a minute or two for a single page. Plan mode’s design step takes a little longer because it renders options for you to choose from.
What if a build runs out of room or errors?
What if a build runs out of room or errors?
You get a clean message and a full refund — you’re only charged when a result is delivered. Re-prompt at no cost.
Can I undo a change?
Can I undo a change?
Yes. Reverting restores an earlier version as a new commit, so your history is never destroyed.
Credits & billing
What does each action cost?
What does each action cost?
A new project is 3 credits, an edit is 2, and a template remix is 5. New accounts start with 5 free credits.
Is there a subscription?
Is there a subscription?
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.
Do credits expire?
Do credits expire?
No. Credits never expire and sit in your account until you use them.
What do the packs cost?
What do the packs cost?
Pro is 100 credits for 0.30 each); Ultra is 1,000 credits for 0.27 each — 10% off the Pro rate). See Credits & pricing.
How do I pay?
How do I pay?
In USDT (or USDC) on the TRON network (TRC-20), from any TRON wallet. The checkout shows the exact amount to send.
What happens if a build fails — am I charged?
What happens if a build fails — am I charged?
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.
How do referrals work?
How do referrals work?
When someone you referred makes their first top-up of $30 or more, you receive 50 credits — one reward per referred person.
Backend & data
Does Mythos include a database?
Does Mythos include a database?
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.
Why bring my own Supabase?
Why bring my own Supabase?
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.
How do I connect a backend?
How do I connect a backend?
Connect your Supabase project under Services → Cloud in the workspace, either by pasting credentials or via Supabase’s OAuth. On connect, Mythos commits the Supabase setup into your repo so the agent can wire your app to it.
Can Mythos add a login system or save form submissions?
Can Mythos add a login system or save form submissions?
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.
Publishing
How do I put my site online?
How do I put my site online?
Publish it to a live
*.r21.dev URL from the workspace. You can add a custom domain later. See Publishing.Is a published site public?
Is a published site public?
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.
Can I change a site after publishing?
Can I change a site after publishing?
Yes. Keep building and editing in the workspace, then publish again to update the live site.
Your code & ownership
Where does my project live?
Where does my project live?
Mythos builds it in a private repository and keeps that internal copy private. Connect your GitHub account once and you can export a clean, separate repository that is yours — one per project. Every build and edit is a real commit in Mythos’s repository.
Do I own the code?
Do I own the code?
Yes — the output is real code, not a locked-in template, and it is yours to take. By default it lives in Mythos’s private repository; connect your GitHub account once and export a clean copy into your own GitHub. You can read it, edit it in the workspace, and take it with you.
Can I edit the code directly?
Can I edit the code directly?
Yes. The workspace has a code editor for direct, precise changes, alongside chat-based editing. The editor is desktop-only.
How do I sign in?
How do I sign in?
With Google, GitHub, or a one-time code sent to your email — no passwords. See Signing in.
Related
- Welcome to Mythos — what Mythos is.
- Quick start — build and publish your first project.
- Dashboard & workspace tour — where everything lives.
- Credits & pricing — costs, packs, and refunds.
- Signing in — accounts and sign-in options.