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riff
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⑂ Riff
Prompt → a running full-stack app. Then fork it.
Open-source, self-hostable Lovable / v0 / bolt — where every app runs in a real Firecracker microVM, stays live forever for ~$0, and you can fork the running app and its database to explore variations in parallel.
Describe an app. Riff builds it and runs it live on a real microVM in about a second. Then — the part nothing else can do — fork the running app into N live variations, compare them side by side, and keep the one you like. Each branch is a genuine isolated VM (with its own cloned Postgres), not a browser tab.
Why Riff exists
Lovable, v0, and bolt are closed SaaS, and every one of them hits the same walls:
| Their wall | How Riff removes it |
|---|---|
| Toy/ephemeral backends (browser sandboxes, WebContainers) | Real Firecracker microVMs — any framework, real servers, background jobs, |
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