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OONI Probe

OONI Probe

Measure Internet Censorship

82 ratings
30 reviews
📚 Education
🔧 Utilities
Free

Details

  • Released
  • Updated
  • February 8, 2017
  • July 1, 2026

Developer

The Tor Project, Inc
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About

This app helps you detect internet censorship and surveillance systems by examining website and app blocking. It also measures your network's speed and performance, providing data that can serve as evidence of interference. All collected data is published openly to promote transparency.

✓Examine website and app blocking
✓Measure network speed and performance
✓Detect censorship and surveillance systems
✓Collect evidence of internet censorship
✓Publish open network measurement data
✓Free and open source software
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What's New in OONI Probe

6.1.1

July 1, 2026

* Measurement engine is OONI Probe CLI v3.29.0 * Bug fixes and improvements

User reviews

Most RecentHighest RatedLowest Rated

Crashes

The app only exits when run.
iPad Mini 5
fayfoxxheartsfayfoxxhearts

Dangerous app

I had used this app many times over the last year, but after today I will not use it again! A hacker or hackers accessed my personal information in my phone including location, camera, phone calls, text, pictures, etc. it appears this happened while using the application tThe hacker(s) gave 3 messages in the Ooni app bragging about the hack. I have sent the information to OONI in hopes that they can resolve this issue snd put my mind at ease.
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JayeC01JayeC01

Horrendously slow

Nothing more to say. Takes minimum 30 mins to run all tests at once
JevwupaJevwupa

Needs sites update

Multiple sites need update. Ex:feedtheminds [.] org is now defunct and has been hacked so scanning it is pointless.
Pagan PoetryPagan Poetry

App works well

You guys are awesome! Keep up the good work. Full transparency is great in a digital age. Useful utility for debugging Dev projects. Domo arigatou!
VreverbVreverb
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FAQ

What does OONI Probe do?

OONI Probe helps you examine the blocking of websites and instant messaging apps, measure your network's speed and performance, and check for systems that could be responsible for censorship and surveillance. It aims to uncover internet censorship around the world.

How can OONI Probe help me detect censorship?

You can run tests within OONI Probe to check if and how specific websites and instant messaging apps are blocked. The network measurement data collected can serve as evidence of internet censorship.

Is OONI Probe free to use?

Yes, OONI Probe is a free software project. All tests, including implementations for network speed and video streaming performance, are based on free and open source software.

What kind of network performance can I measure?

OONI Probe allows you to measure the speed and performance of your network using its implementation of the Network Diagnostic Test (NDT). You can also measure video streaming performance with the Dynamic Adaptive Streaming over HTTP (DASH) test.

Where can I see the data collected by OONI Probe?

OONI publishes all network measurement data openly. You can explore and download this data on the OONI website at https://ooni.io/data/, which allows third parties to verify findings and conduct independent studies.