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This guide takes you from a blank account to a published site, using your free credits — nothing to pay to follow along.

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Before you start

  • A Mythos account (sign in with Google, GitHub, or an email code).
  • Your 5 free credits — granted automatically when you confirm your account. A first build costs 3, so the free credits cover it.
Two later steps have their own prerequisites: the backend step needs a Supabase project to connect, and exporting the code needs a one-time GitHub connect. Neither is required to build and publish your first site.

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Build your first project

1

Start from a prompt

On your dashboard, type what you want to build in the prompt box. Be specific about the kind of site and its sections — Mythos turns vague prompts into real ones, but detail gets you closer on the first try.
Create a landing page for a moving company called Iron Anchor —
hero, services, pricing, testimonials, and a quote-request form.
Dark, industrial look.
2

(Optional) Plan it first

Toggle Plan mode before sending to answer a few questions (services, palette, typography), pick from a few rendered design directions, and approve a short plan before any code is written. See Plan mode. Planning is free — you only spend credits on the build itself.
3

Watch it build

Mythos scaffolds the project and streams a live progress card, then a preview. This first build costs 3 credits. Behind the scenes it’s a real commit in the project’s private repository. Connect your GitHub account once and you can export a clean copy that is yours anytime.
4

Iterate

Refine in chat — each edit costs 2 credits:
Make the hero background darker and add a logo placeholder.
Add an FAQ section with four questions.
Or open the workspace editor to change the code directly when you want precise control.
5

Add a backend (optional)

To make the quote form actually save submissions, connect your own Supabase project under Services → Cloud. Mythos then wires the form to a real table in your database. See Connect Supabase.
6

Publish

When you’re happy, publish to a live *.r21.dev URL. You can add a custom domain later. See Publishing.

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While a build runs

Generation is asynchronous, so the chat moves through a few states:
StateWhat you seeWhat you do
BuildingA live progress card in the chatWait — a single page is usually a minute or two
DeliveredA result card, and the preview updatesOpen the preview, then iterate or publish
RefundedA short message that something went wrong, credits backRe-prompt — you were not charged
Publishing makes your site public on the internet — anyone with the URL can open it. Review what’s on the page (and that no private keys are in the frontend) before you publish.

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Tips for a good first build

Name the sections you want (“hero, services, pricing, FAQ, footer”) and the tone (“clean and minimal” / “dark and bold”). Mythos writes real copy for your industry — mentioning the industry helps.
  • Describe one page well rather than asking for a whole multi-page site up front — you can add pages by chat afterward.
  • If you need a form to store data, say so — then connect Supabase so it has somewhere to save.

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Limitations to know up front

  • Mythos builds the frontend. A database, auth, and file storage come from your connected Supabase project, not from Mythos.
  • A build that runs out of room or errors is refunded — you’re only charged when a result is delivered.

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FAQ

Usually a minute or two for a single page. Plan mode’s design step takes a little longer because it renders a few options for you to choose from.
No. You can build and iterate entirely in chat. The code editor is there when you want it.
Mythos builds it in a private repository and keeps that internal copy. Connect your GitHub account once and you can export a clean, separate repository that is yours — one per project.
Yes. Reverting restores an earlier version as a new commit, so your history is never destroyed.