| What it does | Open-source anti-detect Chromium for Playwright
| Open-sourcing Karotte, a framework for building robust reinforcement learning environments
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| Stage | Established
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| Founded | Not given
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| Based in | Not given
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| Pricing model | Freemium
| Open source
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| Pricing | Free tier for one browser with GitHub account (auto-renewing 30-day key). Pro subscription at $49/month or $441/year for up to 250 concurrent browsers. Hosted browsers billed at €1 per GB of traffic with no plan fees, minimum prepaid €5.
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| Key features | - Engine-level fingerprint control for Canvas, WebGL, audio, fonts and hardware
- Playwright and Puppeteer SDKs for Python, Node and .NET
- Persistent identities with same seed producing same device every session
- TLS and HTTP/2 fingerprinting matched to Chrome version
- Proxy support with automatic timezone and language matching
- Hosted cloud browsers billed per GB with residential IPs
- Docker and CDP endpoint support
- MCP server for AI agents including Claude, Cursor and Cline
- WebRTC proxy IP matching
| - Sandboxed execution with non-privileged user isolation
- Process termination before grading
- Suspicious file detection and rejection
- Out-of-memory and fork-bomb prevention
- Hardened through one million evaluation runs
- Red-team tested for reward hacking vulnerabilities
- Scalable environment execution
- Robust benchmark building support
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| What makes it different | - Fingerprints set in Chromium engine rather than injected into pages
- Fully open-source and reproducible from public source code
- Same engine available self-hosted, containerized, or hosted in cloud
- Drop-in replacement for Playwright and Puppeteer with minimal code changes
- Cross-realm consistency with agreement between main thread, workers and iframes
| - Provides secure defaults and primitives specifically designed to prevent reward hacking in RL training
- Hardened through real-world testing at scale with over one million evaluation runs
- Designed for training environments where defenses must withstand continuous optimization attempts
- Addresses AI alignment at the highest leverage point through better environment construction
- Built and tested internally by frontier AI research team
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| Free plan | Not given
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| Open source | Not given
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| Platforms | Not given
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| Public API | Not given
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| Community votes | 0 | 0 |
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| DR (Domain Rating by Ahrefs) | 26 ▲ +1 (up) since last check | 29 ▲ +1 (up) since last check |
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| Trust Flow (Majestic) | 19 | 11 |
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| Citation Flow (Majestic) | 31 | 24 |
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| Referring domains (Majestic) | 163 | 98 |
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Clearcote
Preference Model