What it is

Runs the whole stack in a browser-based container, so the build is real rather than a mockup. Strong for a first version you can click through this afternoon; weaker once you need the database and auth you already run elsewhere. Export the code early — that is the exit door.

Pricing

Free tokens; paid from about $20/mo

Who it suits

Prompt a full-stack app and get a running preview in the browser. If the constraint above matches how you work, this is a safe default. If it does not, check the alternatives below before committing to a subscription.

Alternatives in Coding & Dev

Cursor — A code editor built around an agent that can read your whole repo.
v0 — Generate and iterate on React interfaces from a prompt.
GitHub Copilot — Completion and chat built into the editor most teams already use.