> ## Documentation Index
> Fetch the complete documentation index at: https://docs.mythos.new/llms.txt
> Use this file to discover all available pages before exploring further.

# Frequently asked questions

> Answers to common Mythos questions — building apps, credits and billing, your own Supabase backend, publishing, and exporting your code to GitHub.

Common questions about Mythos, grouped by theme. Each answer links to the page that covers it in full.

<Note>**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](/introduction/credits-and-usage).</Note>

## Building

<AccordionGroup>
  <Accordion title="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.</Accordion>
  <Accordion title="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.</Accordion>
  <Accordion title="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.</Accordion>
  <Accordion title="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](/features/plan-mode).</Accordion>
  <Accordion title="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.</Accordion>
  <Accordion title="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.</Accordion>
  <Accordion title="Can I undo a change?">Yes. Reverting restores an earlier version as a new commit, so your history is never destroyed.</Accordion>
</AccordionGroup>

## Credits & billing

<AccordionGroup>
  <Accordion title="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.</Accordion>
  <Accordion title="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.</Accordion>
  <Accordion title="Do credits expire?">No. Credits never expire and sit in your account until you use them.</Accordion>
  <Accordion title="What do the packs cost?">Pro is 100 credits for $30 ($0.30 each); Ultra is 1,000 credits for $270 ($0.27 each — 10% off the Pro rate). See [Credits & pricing](/introduction/credits-and-usage).</Accordion>
  <Accordion title="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.</Accordion>
  <Accordion title="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.</Accordion>
  <Accordion title="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.</Accordion>
</AccordionGroup>

## Backend & data

<AccordionGroup>
  <Accordion title="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.</Accordion>
  <Accordion title="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.</Accordion>
  <Accordion title="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.</Accordion>
  <Accordion title="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.</Accordion>
</AccordionGroup>

## Publishing

<AccordionGroup>
  <Accordion title="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](/publishing/publish).</Accordion>
  <Accordion title="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.</Accordion>
  <Accordion title="Can I change a site after publishing?">Yes. Keep building and editing in the workspace, then publish again to update the live site.</Accordion>
</AccordionGroup>

## Your code & ownership

<AccordionGroup>
  <Accordion title="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.</Accordion>
  <Accordion title="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.</Accordion>
  <Accordion title="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.</Accordion>
  <Accordion title="How do I sign in?">With Google, GitHub, or a one-time code sent to your email — no passwords. See [Signing in](/introduction/sign-in).</Accordion>
</AccordionGroup>

## Related

* [Welcome to Mythos](/introduction/welcome) — what Mythos is.
* [Quick start](/introduction/getting-started) — build and publish your first project.
* [Dashboard & workspace tour](/introduction/dashboard-overview) — where everything lives.
* [Credits & pricing](/introduction/credits-and-usage) — costs, packs, and refunds.
* [Signing in](/introduction/sign-in) — accounts and sign-in options.