Steel Browser vs onUI
A side-by-side comparison of Steel Browser and onUI — pricing, license, deployment, and where each tool wins.
Steel Browser
github.com
Open-source browser sandbox and automation infrastructure for AI agents and apps with session-backed workflows, screenshots, PDFs, proxies, and anti-bot tooling.
onUI
github.com
Open-source browser extension and MCP server for annotation-first UI pair programming with AI agents. Works with Claude Code, Cursor, Windsurf, Copilot. Chrome, Edge, Firefox. Free, GPL-3.0.
| Feature | Steel Browser | onUI |
|---|---|---|
| Pricing | Freemium | Freemium |
| Model | Freemium | Freemium |
| License | Proprietary | Proprietary |
| Deployment | Cloud | Cloud |
| Category | Code & Development | Code & Development |
| Self-hosted | ✕No | ✕No |
| Free tier | ✓Yes | ✓Yes |
Pick Steel Browser if…
- ✓You prefer Steel Browser's feature set or ecosystem fit.
Pick onUI if…
- ✓You prefer onUI's feature set or ecosystem fit.