Bolt

Verified 19 Aug 2026

StackBlitz’s in-browser agent that builds apps in WebContainers.

Bolt (bolt.new) is StackBlitz’s agentic app builder. It uses WebContainers to run Node in the browser, so the agent’s computer is the tab. That is a distinct sandbox from a cloud VM.

Execution Sandboxing

Model independence: Multi-model
Deployment: Cloud
Open source: No
License: Proprietary (Bolt); WebContainers are a StackBlitz technology
Pricing model: Mixed
Added / updated: 19 Aug 2026 / 19 Aug 2026

bolt.new · Docs

Editorial take

Bolt is the listing that makes WebContainers a factory primitive: the sandbox is the browser. Brilliant for front-end and Node demos. Insufficient when you need a real network policy, a VPC, or a language WebContainers cannot run. Pair with the WebContainers listing if you are assembling, not buying Bolt as a platform.

Strengths

In-browser runtime means no laptop toolchain and a visible computer.
Fast greenfield loop from prompt to running app.
Shares DNA with StackBlitz’s WebContainer tech.

Limitations

Browser sandbox limits (languages, network, persistence).
Proprietary product on top of the WebContainer engine.
Not for existing private monorepos with native dependencies.

Fields last checked against primary sources on 19 Aug 2026. Pricing and plan names rot; follow the vendor URL.