Build your first app
This guide takes you from an idea to a live first app. You will build one focused page for a fictional coffee roaster, review it in Preview, make one improvement, and publish it.
Start by signing in to an account with access to your workspace. This guide begins at the dashboard. See Signing in and accounts if you need help getting there.
Before you start
Have three things ready:
- The outcome you want, such as a landing page, portfolio, or dashboard.
- The content or sections that matter most.
- Enough balance for the action. Credits and usage explains the usage-based Build costs, limits, and refund behavior.
You do not need a finished specification. A clear audience, purpose, and visual direction are enough for a useful first result.
Build the first version
Start a project
Open the dashboard and use the main composer. For this guide, enter:
This prompt names the business, the page structure, and the desired feel while leaving room for Mythos to make sensible design decisions.
Choose Build or Plan
Choose Build when the brief is ready and you want to go straight to a result. Choose Plan when you want Mythos to ask focused questions and prepare an editable plan before it changes the project. See Plan mode.
Ask for one improvement
You do not need to repeat the original brief. Describe the exact section and the change you want:
Review the updated preview when the edit finishes. If the change moved in the wrong direction, use Version history to inspect an earlier version or revert safely.
Focused follow-ups are easier to verify. Ask for one coherent outcome at a time, then look at the result before sending the next request.
Publish when it is ready
Choose Publish in the workspace, review the project name and URL, and confirm. Publishing uses the latest delivered version; later workspace edits do not change the live site until you publish again.
A published site is public on the internet. Remove private information and test the visible content before you confirm.
Continue from here
- Dashboard and workspace — learn where each part of the project lives.
- Writing good prompts — turn a rough idea into a useful brief.
- Managed Supabase backend — add saved data, uploads, or app authentication.
- Publishing — understand updates, public URLs, and publish states.

