Directory / Bolt
Bolt
Verified
StackBlitz app-building agent running in WebContainers.
Bolt is StackBlitz’s app-building agent. It runs Node through WebContainers in the browser, making the browser tab the agent’s execution environment instead of a cloud VM.
- Model support
- 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
Assessment
Bolt is well suited to front-end and Node prototypes because the browser is the execution environment. Browser limits make it unsuitable for workloads requiring VPC networking, native dependencies, or unsupported languages. WebContainers is the underlying primitive; Bolt is the application.
Strengths
- Visible in-browser runtime.
- Prompt-to-running-app loop for greenfield work.
- Uses StackBlitz WebContainers.
Limitations
- Browser limits on languages, network, and persistence.
- Proprietary application layer.
- Poor fit for private monorepos with native dependencies.