# Tor Browser privacy rating

Firefox-based browser that routes traffic through the Tor network to hide the user's IP address and location. Isolates each site and makes users look alike to resist tracking and fingerprinting.

## Summary

Tor Browser scores 93 out of 100 (grade A) on the browsers criteria. It meets 7 of 8 criteria: open source, no trackers or telemetry, no ads or data sales, independent audit, fingerprinting protection, no calls to big-tech services and timely security updates. It partly meets blocks trackers by default. It is based in the United States: Five Eyes member; subject to the US CLOUD Act.

- Website: https://www.torproject.org
- Source code: https://gitlab.torproject.org/tpo/applications/tor-browser
- Jurisdiction: United States. Five Eyes member. Subject to the US CLOUD Act.
- Home page trackers: none found
- Category: [Browsers](https://privacyratings.com/browsers/)
- Also rated: [Tor](https://privacyratings.com/anonymity-networks/tor/) (Anonymity networks)
- Grade: A (93/100)

## Criteria

| Criterion | Answer | Note | Evidence |
| --- | --- | --- | --- |
| Open source | Yes | MPL-2.0, built on Firefox ESR. Source releases are published at dist.torproject.org. The Tor GitLab now requires sign-in to view files. | https://www.torproject.org/about/history/ |
| No trackers or telemetry | Yes | No tracking, telemetry or analytics. | https://www.torproject.org/about/privacy_policy/ |
| No ads or data sales | Yes | Nonprofit funded by donations and grants. No ads. | https://donate.torproject.org/ |
| Independent audit | Yes | Cure53 audited changes in Tor Browser for desktop and Android, with the full report published. | https://www.torproject.org/static/findoc/code_audits/Cure53_audit_jan_2024.pdf |
| Blocks trackers by default | Partial | Isolates each site so third-party trackers cannot follow users across sites, but does not block tracker requests. | https://www.torproject.org/ |
| Fingerprinting protection | Yes | Standardizes fingerprinting data by default so users look alike. | https://support.torproject.org/tor-browser/features/fingerprinting-protections/ |
| No calls to big-tech services | Yes | No background connections to Google, Microsoft or Apple services. Traffic goes through the Tor network. | https://www.torproject.org/about/privacy_policy/ |
| Timely security updates | Yes | Releases follow Firefox ESR security updates and can install automatically. | https://support.torproject.org/tor-browser/getting-started/updating/ |

Source: https://privacyratings.com/browsers/tor-browser/
Edit: https://github.com/privacyratings/privacyratings.com/edit/main/ratings/browsers/tor-browser.md