Collect evidence of Internet censorship. Measure the speed and performance of your network. Play an active role in increasing transparency of information controls around the world.
By running OONI Probe, you will examine the blocking of websites, your network's speed and performance, and whether systems that could be responsible for censorship and surveillance are in your network.

These tests have been developed by the Open Observatory of Network Interference (OONI), a free software project (under The Tor Project) that aims to uncover Internet censorship around the world.
Since 2012, OONI has collected millions of network measurements across more than 190 countries, shedding light on multiple cases of network interference. By running OONI Probe, you will help increase transparency of Internet censorship around the world.

▶ Collecting evidence of Internet censorship
OONI's Web Connectivity test is designed to examine whether access to sites is blocked through DNS tampering, TCP/IP blocking, or by a transparent HTTP proxy. By running this test, you will collect data that can serve as evidence of Internet censorship, and you will be provided with circumvention tips.

▶ Detecting systems responsible for censorship and surveillance
OONI's HTTP Invalid Request Line test is designed to uncover the presence of systems that could be responsible for censorship and surveillance.

▶ Measuring the speed and performance of your network
OONI's implementation of the Network Diagnostic Test (NDT) measures the speed of your network by connecting to M-Lab servers near you and by collecting low level TCP/IP information that can help characterize the speed and performance of your network.

▶ Open data
OONI publishes all network measurement data that it collects because open data allows third parties to conduct independent studies, verify OONI findings and/or to answer other research questions. Such data also helps increase transparency of Internet censorship around the world. All data is published on OONI Explorer:

▶ Free software
All OONI tests, as well as its NDT implementation, are based on free and open source software. You can find the source code through the following link:

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Please note: Running OONI Probe might be against the terms of service of your ISP or legally questionable in your country. By running OONI Probe you will connect to web services which may be banned, and use web censorship circumvention methods such as Tor. The OONI project will publish data submitted by probes, possibly including your IP address or other identifying information. In addition, your use of OONI Probe will be clear to anyone who has access to your computer, and to anyone who can monitor your Internet connection (such as your employer, ISP or government).

What's New

Version 1.3.2

The latest release includes improvements to the engine that powers the app, as well as to the lists of URLs that are tested.

Ratings and Reviews

4.8 out of 5

22 Ratings

22 Ratings

Great Internet Connectivity Tool


I am very impressed with this free tool. I have paid apps like Net Analyzer but this free tool offers a bunch of great Internet related data for no charge and the information is easy to understand for the layman.

Powerful tool Commander

If you live in a boring (censorship wise) country, creating a baseline is good when the country you live in becomes a very interesting country(censorship wise).

This is a great tool of the nimble to track the strong.

Speed rates need to be corrected


Misleading rate of speed in tests reporting speed. Given the numbers being reported, speed should be mbs (megabits per second) not MBs (Mega Bytes per second). To get MBs you would need to divide the reported number by 8.

Developer Response

Thanks for reporting this. We have implemented a fix for this ( and it's going to be included in the upcoming 1.3.1 release.


The Tor Project, Inc
22.4 MB
Requires iOS 9.0 or later. Compatible with iPhone 5s, iPhone 6, iPhone 6 Plus, iPhone 6s, iPhone 6s Plus, iPhone SE, iPhone 7, iPhone 7 Plus, iPhone 8, iPhone 8 Plus, iPhone X, iPad Air, iPad Air Wi-Fi + Cellular, iPad mini 2, iPad mini 2 Wi-Fi + Cellular, iPad Air 2, iPad Air 2 Wi-Fi + Cellular, iPad mini 3, iPad mini 3 Wi-Fi + Cellular, iPad mini 4, iPad mini 4 Wi-Fi + Cellular, 12.9-inch iPad Pro, 12.9-inch iPad Pro Wi-Fi + Cellular, 9.7-inch iPad Pro, 9.7-inch iPad Pro Wi-Fi + Cellular, iPad (5th generation), iPad Wi-Fi + Cellular (5th generation), 12.9-inch iPad Pro (2nd generation), 12.9-inch iPad Pro Wi‑Fi + Cellular (2nd generation), 10.5-inch iPad Pro, 10.5-inch iPad Pro Wi‑Fi + Cellular, iPad (6th generation), iPad Wi-Fi + Cellular (6th generation), and iPod touch (6th generation).
English, Arabic, French, German, Greek, Hindi, Italian, Japanese, Persian, Russian, Simplified Chinese, Spanish, Traditional Chinese
Age Rating
Rated 4+
© 2017 Open Observatory of Network Interference


  • Family Sharing

    With Family Sharing set up, up to six family members can use this app.

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