Bolt.new
StackBlitz's in-browser AI app builder. Chat to generate, run, and deploy full-stack apps entirely in the browser via WebContainers. Auto-routes prompts to the best model per task and ships with Bolt Cloud backend infrastructure.
What it is
Bolt.new lets you build apps and websites by chatting with an AI agent, with the entire dev environment - install, run, and preview - executing in the browser on StackBlitz's WebContainers technology. Unlike a copilot that suggests edits, Bolt drives the full loop: it scaffolds the project, runs it, catches and fixes errors, refactors, and iterates so the builder focuses on the vision instead of the toolchain. Source: bolt.new, https://bolt.new/, 2026-05-31
Capabilities
- Automatic model routing - Bolt routes each task to the right model to balance quality and cost, instead of forcing the user to pick an agent.
- Self-correcting loop - it automatically tests, refactors, and iterates to reduce errors.
- Large-project context - improved built-in context management handles projects described as up to 1,000x larger than earlier versions.
- Bolt Cloud - integrated, enterprise-grade backend: hosting, databases, and integrations inside one interface, so builders avoid stitching separate platforms together. Source: bolt.new, https://bolt.new/, 2026-05-31
The open-source core lives at stackblitz/bolt.new.
Where it fits
Bolt.new is the closest competitor to v0 by Vercel in the prompt-to-app category. The split: Bolt emphasizes a fully in-browser environment (WebContainers) plus its own Bolt Cloud backend, while v0 emphasizes production git workflows and Vercel-native deploys. Both target the same shift - non-engineers and engineers shipping real software from prompts. For AI features inside generated apps, the Vercel AI SDK is the common TypeScript layer; for a local agentic IDE instead of a browser builder, see Windsurf Editor or Cursor 2.0 and Composer. For traditional managed hosting, contrast Bolt Cloud with Render Cloud Platform.
Timeline
- 2024-09 | StackBlitz open-sourced the Bolt.new core (
stackblitz/bolt.new), pairing its WebContainers runtime with an AI build agent. Source: GitHub, https://github.com/stackblitz/bolt.new, 2024-09-24 - 2026-05-31 | Tool page created. Bolt positions around automatic model routing, a self-correcting build loop, large-project context, and the integrated Bolt Cloud backend. Source: bolt.new, https://bolt.new/, 2026-05-31