Tor Browser vs Zen Browser Comparison
| Feature | ||
|---|---|---|
| Overview | ||
| Rating | 8.3 | 5.2 |
| Established | 2008 | 2024 |
| Platforms |  Windows macOS Linux Android | WindowsmacOSLinux |
| Privacy | ||
| Source code | Fully open source | Fully open source |
| Telemetry | No telemetry | On unless you opt out |
| Anti-fingerprinting | Aggressive | Basic |
| Ad/tracker block built-in | No | No |
| End-to-end encrypted sync | No | Yes |
| Independent security audit | Cure53 2023Show audit detailsHide audit details72-day penetration test and code audit of Tor Browser and the censorship-circumvention tools around it (bridge connection methods, OONI Probe, rdsys, BridgeDB, Conjure); two high-severity issues, both in bridge-distribution backends rather than the browser, fixed afterwards | None on record |
| Technical | ||
| Engine | Firefox ESR | FirefoxShow detailsHide detailsTracks upstream Firefox releases within 0-72 hours of release, plus Firefox Release Candidate builds about a week early on the separate Twilight channel. |
| Default search | DuckDuckGo | |
| Built-in VPN/proxy | Not specified | No |
