Comparison
Verified against publicly documented behaviour as of 13 August 2026.
Versus MCP browser automation tools
| T3rnel | Chrome DevTools MCP | Playwright MCP | mcp-chrome | Browser Use | Browser MCP | Nanobrowser | Agent Browser | Stagehand | |
|---|---|---|---|---|---|---|---|---|---|
| Your existing profile | Yes | No | No | Yes | No | Yes | Yes | No | No |
| Logged-in sessions work | Yes | No | No | Yes | No | Yes | Yes | No | No |
| Real browser fingerprint | Yes | Automation flags | Automation flags | Yes | Automation flags | Yes | Yes | Automation flags | Automation flags |
| Tool count | 84 | ~26 | ~25 | ~20 | ~15 | 11 | ~10 | ~15 | ~10 |
| CDP trusted input | Yes | Yes | No | Yes | No | No | No | No | No |
| Contenteditable editors | Yes | No | Yes | No | Yes | Yes | No | No | No |
| Credential redaction | Yes | No | No | No | No | No | No | No | No |
| Approval gate that refuses | Yes | No | No | No | No | No | No | No | No |
| Prompt-injection flagging | Yes | No | No | No | No | No | No | No | No |
| Delta snapshots | Yes | No | No | No | No | No | No | No | No |
| Time-travel timeline | Yes | No | No | No | No | No | No | No | No |
| Export Playwright/Cypress code | Yes | No | No | No | No | No | No | No | No |
| CSS inspection | Yes | No | No | No | No | No | No | No | No |
| Human-facing GUI | Side panel | CLI | CLI | Minimal | Library | Minimal | Side panel | CLI | Library |
| Local-only | Yes | Yes | Yes | Yes | Optional cloud | Yes | Yes | Yes | Cloud option |
| Price | Free + $29.99 | Free | Free | Free | Free | Free | Free | Free | Free + paid cloud |
| Licence | Proprietary | Apache-2.0 | Apache-2.0 | MIT | MIT | Proprietary | Apache-2.0 | MIT | MIT |
The honest read
T3rnel does not beat these on being free, and never will — several are backed by Google and Microsoft, and they are good. It beats them on three things: a human can watch and stop what happens, credentials do not leak into a context window, and the agent does not have to re-authenticate into a fresh browser because it is already in yours.
If all you need is scripted automation in a throwaway browser, use Playwright MCP. It is excellent and it is free.
Versus CSS inspection tools
| T3rnel Pro | CSS Scan | CSS Peeper | VisBug | |
|---|---|---|---|---|
| Hover inspect and copy | Yes | Yes | Yes | Partial |
| Pseudo-classes, media queries, keyframes | Yes | Yes | No | No |
| Authored unit preservation | Yes | Yes | No | No |
| Tailwind conversion | Yes | Yes | No | No |
| styled-components / Emotion / JSX output | Yes | No | No | No |
| Honest partial reporting on cross-origin sheets | Yes | No | No | No |
| Full-page screenshots and annotation | Yes | No | No | No |
| Visual regression testing | Yes | No | No | No |
| Test code export | Yes | No | No | No |
| AI agent control | Yes | No | No | No |
| Price | $29.99 one-time | ~$100–120 lifetime | Free | Free |
Versus screenshot extensions
| T3rnel | GoFullPage | Awesome Screenshot | Fireshot | |
|---|---|---|---|---|
| Full-page stitched capture | Yes | Yes | Yes | Yes |
| Sticky header pinning | Yes | Partial | Partial | Partial |
| Cookie banner auto-dismiss | Yes | No | No | No |
| Blur / redact | Yes | No | Yes | Yes |
| Visual regression baselines | Yes | No | No | No |
| Programmatic capture for agents | Yes | No | No | No |
| Local-only, no account | Yes | Yes | Account for cloud | Yes |