Onion Browser is a minimal web browser that encrypts and tunnels web traffic through the Tor onion router network and provides other tools to help browse the internet while maintaining privacy. See more features & benefits.
Security note: Research into Onion Browser suggests that browser content — including cookies — may be retained, depending on how an app is closed or if the app crashed. Users are encouraged to press the "New Identity" button before closing the app, as this will ensure that all session data in Onion Browser is wiped from the device.
March 18, 2015, FREAK exploit: Devices running iOS versions older than 8.2 are vulnerable to the FREAK (Factoring RSA Export Keys) SSL exploit systemwide, including inside Onion Browser, Safari, etc. This exploit can greatly reduce HTTPS connection strength and allow possible decryption of HTTPS traffic. iOS 8.2 contains a fix for the exploit. (Note that browsing traffic in Onion Browser uses WebKit and the system-provided SSL stack.) Users are strongly encouraged to update their device(s) to iOS 8.2.
By default, Onion Browser's Active Content Blocking feature prevents the standard FREAK client test from running, resulting in an orange warning; if you would like to test your own device, you can try these two links (from the last paragraph on the client test page): Test1 Test2 — both should result in a connection error. If either page loads (saying "VULNERABLE!"), then you are vulnerable to this exploit.
March 17, 2015, Current Version: Onion Browser 1.5.11 is a minor release which fixes an issue with bridges and also detects whether the Tor connection has failed. The underlying Tor library was upgraded to 0.2.6.4-rc, OpenSSL was updated to 1.0.2, and libevent was updated to 2.0.22. More details can be found in the CHANGES.txt file in GitHub. Details on security updates can be found in the Security page. Users are encouraged to update via App Store.
This app (the "official fork") is being sold for $0.99 in the Apple App Store. Click here to download.
Note: The app is currently unavailable in France due to import regulations on encryption software. The app is unavailable and does not work in China and Iran due to these nations blocking access to the Tor network.
Copies of Onion Browser downloaded outside the App Store — via "jailbreak" app directories like Cydia — are built and released by third parties and are not supported by the developer. These copies may have modifications added by the packager, which may interfere with your privacy or security. For the best security, you should purchase the app; in situations where App Store payment is difficult due to security precautions (i.e. using an alias in the App Store that is not listed on a credit card), you may e-mail the developer to request an App Store download code. For best security in non-App Store circumstances, you should build your own copy of the app.
The developer recommends that users interested in supporting the ideals of Onion Browser should donate to the upstream Tor Project and consider operating a relay server to help improve access to Tor. Other great organizations to support are Freedom of the Press Foundation (creators of SecureDrop), the Electronic Frontier Foundation.
Each organization is registered as a 501(c)(3) charity in the United States:
The project is open source and you may freely access the source code on GitHub.
Technical folks should view the README file in the GitHub repository for implementation details and other technical notes.
See the Github project for a current list of known issues.
Using Onion Browser does not inherently guarantee security or privacy. It simply provides a set of features that may enhance privacy and anonymity while browsing the web. For more information: The Tor Project maintains a small section about staying anonymous over Tor, as do several threads on Reddit and other messageboard sites.
"Onion Browser" is a trademark of Mike Tigas. Forks of this project must not use the "Onion Browser" name when distributing binary forms of this application.
The "Onion Browser" icon is a trademark of Mike Tigas. Icon image under the Creative Commons CC-BY-SA 3.0 license. Forks of this project should not use the "Onion Browser" icon when distributing binary forms of this application.
Mike Tigas and OnionBrowser are not affiliated with nor endorsed by the Tor Project. Onion Browser carries no guarantee from The Tor Project about quality, suitability or anything else. ("Tor" is a registered trademark of The Tor Project, Inc.)
Onion Browser is © 2012-2015 Mike Tigas, all rights reserved. Source code available freely under the MIT License.
See the LICENSE file for more information.
This software uses strong cryptography and may it fall under certain export/import and/or use restrictions in some other parts of the world. BEFORE using any encryption software, please check your country's laws, regulations and policies concerning the import, possession, or use, and re-export of encryption software, to see if this is permitted. See http://www.wassenaar.org for more information.
If you are a developer and plan on redistributing this app in source or binary form, please see read “ENCRYPTION NOTICE / APP DISTRIBUTION NOTES” in the LICENSE file for more detailed disclaimers.