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Onion Browser

An open-source, privacy-enhancing web browser for iOS.

Enhance your web privacy

Onion Browser is a free and open-source web browser for iPhone and iPad that encrypts and tunnels web traffic through the Tor network, with extra features to help you browse the internet privately. See more features & benefits.

Onion Browser is recommended by Tactical Technology Collective and ProPublica’s Guide to Safer Communication.
Featured in Ars Technica, The New York Times, Salon, TechCrunch, Boing Boing, Gizmodo, Lifehacker, The Guardian, Cult of Mac, and others.
Read about Onion Browser on the Tor Project site and on the official Tor Project blog.

Current security advisories (last updated 2019-06-18):

WebRTC/Media leaks: Due to iOS limitations, WebRTC and media files leak outside of Tor and are routed over the normal internet. This will reveal your real IP address to sites using these features. (If you are using a VPN, the VPN IP address is revealed instead.) To defend against this, you may set Strict security mode in Host Settings, which will disable Javascript. More information here.
OCSP leak: Visiting EV "Green Bar" HTTPS sites may leak information that can be used to reveal the domain name of the website you are visiting. This is handled within iOS and cannot be changed by Onion Browser. There is no known workaround. A detailed report can be found here.
Further technical information can be found here. Please also see the list of general caveats below.

Latest news:

Please consider supporting ongoing development by becoming a Patreon supporter, by using the in-app purchase, or by sending a one-off payment.
June 18, 2019: Onion Browser 2.2.1 adds an "open in last state" feature, fixes several bugs, and updates localizations for several languages. Users are encouraged to update via App Store.
April 2019: Onion Browser 2.2.0 upgraded Tor to 0.3.5.8, greatly improves reliability when the app comes back from background, and contains more fixes and UI tweaks. Localizations are now available in Turkish, and localizations for most languages have been updated.
September 9, 2018: An update on Patreon about the current state of Onion Browser.
December 2016: New Price! Onion Browser is now free. Read more about it here. If you'd like to support continuing development of Onion Browser and other Tor iOS projects, please consider backing the project on Patreon or donate via one of the other options.

You can read coverage about the price change in Ars Technica, and read about the State of iOS Tor on the official Tor Project blog.

Download

This app available for free in the Apple App Store. Click here to download.

Note: Onion Browser is not available in China due local regulations preventing the distribution of Tor apps in the App Store.

Copies of Onion Browser downloaded outside the App Store — via app directories like Cydia or other "jailbreak" app directories — are not created by the developer of Onion Browser. These copies may have modifications added by the packager, which may interfere with your privacy or security, or they may secretly contain malware. We cannot provide support for copies of Onion Browser acquired through these channels.

Source Code

Onion Browser is open source software so that others may audit/inspect the code and help contribute to the project. You may freely access the source code on GitHub; see license for terms of use and disclaimers.

Donate To Support Onion Browser

Onion Browser is a free app! You can support continuing development of Onion Browser in a few ways:

Send a one-off payment using PayPal, using the "Support Onion Browser" box to the right.
Back the project on Patreon. Users who back the project at the $5 tier can (optionally) appear in the app's credits as a way of thanks. Users who back the project at the $10 tier can receive an invite to test upcoming versions of Onion Browser.
Venmo: mtigas
Send a one-off payment in the app (as of v1.7.6) — see "Help Fund Onion Browser" in the main menu.
Sending Bitcoin: (You can also back the project with Bitcoin on BitPatron)
```
15KxYFRuwWUTXzWjPvJEDrDCZuf76LjrgR
```

Sending Ethereum:

0xF185CfbD064bF8e0d365Ec412675F10151F5c908

Sending Zcash (secure z-addr):

zs1hv9ux5erpemkcv3rq5e38m5ehhs3jrm7k07a2pkvckynej9hmwg8n0wd6ef7fq2ymar5jjdp924

Sending Zcash (public t-addr):
```
t1PieY328RVM13BDFhSK7AbZVegcXP4tfND
```
Other financial support: Get in touch below.

Want to financially support the project another way? Want to use another cryptocurrency, or send to a non-public address? Please get in touch.

Features & Benefits

Internet access is tunneled through the Tor network[1][2]
- Websites do not see your real IP address.
- ISPs and insecure wireless networks cannot see your browsing.
- Access websites, even behind some types of internet filters and censors.
- View .onion websites: the "dark net" of hidden sites only accessible using Tor.
Block third party cookies or all cookies.
Ability to change cookie storage policy (Allow All / Block Third Party / Block All)
Disable scripts and multimedia content that can be used to track you.
Can send the "Do Not Track" HTTP header (DNT: 1) to websites.

Bugs, Caveats, Side Notes

See the release history for a log of Onion Browser release notes, including previous security issues and results of previous security audits. 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.

Disclaimer: Onion Browser only tunnels traffic within the Onion Browser app. You are still using a smartphone you should be aware that information outside of Onion Browser will continue to use your normal connection.
Limitations in iOS: iOS has full control over some network traffic, which may result in this traffic (including audio or video embeds) routing via your normal connection and not over Tor
Time Zone and other basic JavaScript identification: Websites may use Javascript to ask the browser for local time, therefore revealing your real time zone. Disabling Javascript (using the Strict security setting) is the only way to bypass this.
Geolocation and other advanced HTML5 features: Websites may use the HTML5 Geolocation API (to view your current GPS location) and other new HTML5 features unless "Strict" security mode is set. Users should also remain vigilant for any pop-ups asking for permission to access location data.
Common Sense: If you log into websites in Onion Browser that you normally log into outside of the Tor network, they will a) still know who you are, and b) know that you use Tor. In certain circumstances (i.e. political dissent in repressive nations), this may be incriminating information in itself.

Copyright & Legal

Onion Browser is copyright © 2012-2018 Tigas Ventures, LLC. All rights reserved. "Onion Browser" and the Onion Browser logo are trademarks of Tigas Ventures, LLC. Onion Browser 1.X is distributed under terms of the Mozilla Public License 2.0 (MPL); Onion Browser 2.X is distributed under the Endless / Onion Browser License (OBL).

Onion Browser is 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.

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.

Any use of the app is subject to the MPL or OBL (depending on your version of Onion Browser; see above), any applicable Apple Terms of Use or End User License Agreement, and any other applicable third-party licenses (as included in the app credits). Onion Browser is provided as-is and use of the app is at your own risk; see the MPL or OBL for full disclaimer of warranty.

If you are a developer and plan on redistributing this app in source or binary form, please see read the LICENSE file (1.X; 2.X) for full license details and legal obligations.

Privacy Policy & Privacy Notices

Onion Browser does not directly collect any data on user activity. Other than what is built into iOS, Onion Browser does not utilize any third party analytics.

Information on iOS data collection (App Store account info, opt-in analytics, etc), and its privacy policy (and full legal compliance information), can be found here: https://www.apple.com/legal/privacy/en-ww/

In particular, analytics data collection is opt-in (Settings->Privacy->Analytics in iOS) and is aggregated and anonymized using differential privacy techniques to make it difficult or impossible to extract an individual user’s information from the aggregated data. https://images.apple.com/privacy/docs/Differential_Privacy_Overview.pdf

Apple only makes this data available in aggregate and the Onion Browser developers do not have access to an individual user’s information. For examples of the aggregate data made available, see: https://developer.apple.com/app-store/app-analytics/