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+ Supabase auth, database, and edge functions are wired up without any configuration.
− Credits run out fast when debugging, since every fix attempt costs a message.

+ Backend, user management, and hosting are all included, so there is nothing to connect.
− Limited code export and less customisation than Lovable or Bolt.

+ Hosting, database, auth, and secrets live in one place, so deployment is a button.
− Effort-based billing makes costs unpredictable and the agent has deleted user data in a notorious incident.

+ Runs npm, dev servers, and builds entirely in the browser so nothing is installed.
− Token-metered pricing burns through the monthly allowance on larger projects.

+ Produces a real Python backend, which suits data-heavy and API-heavy apps.
− Slower and pricier per build than front-end-only builders.

+ Goes from prompt to a deployed Firebase-backed app without leaving the browser.
− The App Prototyping agent is Next.js-centric and the cloud IDE can feel sluggish.

+ Output uses shadcn/ui and Next.js idiomatically, so it drops straight into real projects.
− Heavily biased to the Vercel stack; other frameworks get worse results.

+ Starts from your existing Figma frames and design system, not a blank prompt.
− Output is prototype-grade and harder to hand off to a real codebase than v0.