OONI Probe
The Tor Project Tools
Measure Internet Censorship, Speed & Performance
- Rating
- 4.4
- 3.2K ratings
- Downloads
- 593K+
- on Google Play
- Price
- Free
- No in-app purchases
- Updated
- Sep 28
- 2026 · v6.2.1
Screenshots
About OONI Probe
Are websites and social media apps blocked? Is your network unusually slow? Run OONI Probe to find out!
With this app, you will examine the blocking of websites and instant messaging apps, measure your network's speed and performance, and check whether systems that could be responsible for censorship and surveillance are in your network.
OONI Probe is 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’s global community has collected millions of network measurements from more than 200 countries, shedding light on multiple cases of network interference.
Collect evidence of internet censorship
You can check whether and how websites and instant messaging apps are blocked. The network measurement data you will collect may serve as evidence of internet censorship.
Detect systems responsible for censorship and surveillance
OONI Probe tests are also designed to uncover the presence of systems (middleboxes) that could be responsible for censorship and surveillance.
Measure the speed and performance of your network
You can measure the speed and performance of your network by running OONI's implementation of the Network Diagnostic Test (NDT). You can also measure video streaming performance with the Dynamic Adaptive Streaming over HTTP (DASH) test.
Open data
OONI publishes network measurement data because open data allows third parties to verify OONI findings, conduct independent studies, and answer other research questions. Openly publishing OONI data also helps increase transparency of internet censorship around the world. You can explore and download OONI data here: https://ooni.io/data/
Free software
All OONI Probe tests (including our NDT and DASH implementations), are based on free and open source software. You can find OONI software projects on GitHub: https://github.com/ooni. Curious to learn how OONI Probe tests work? Learn more: https://ooni.io/nettest/
To receive updates from the OONI-verse, follow us on Twitter: https://twitter.com/OpenObservatory
With this app, you will examine the blocking of websites and instant messaging apps, measure your network's speed and performance, and check whether systems that could be responsible for censorship and surveillance are in your network.
OONI Probe is 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’s global community has collected millions of network measurements from more than 200 countries, shedding light on multiple cases of network interference.
Collect evidence of internet censorship
You can check whether and how websites and instant messaging apps are blocked. The network measurement data you will collect may serve as evidence of internet censorship.
Detect systems responsible for censorship and surveillance
OONI Probe tests are also designed to uncover the presence of systems (middleboxes) that could be responsible for censorship and surveillance.
Measure the speed and performance of your network
You can measure the speed and performance of your network by running OONI's implementation of the Network Diagnostic Test (NDT). You can also measure video streaming performance with the Dynamic Adaptive Streaming over HTTP (DASH) test.
Open data
OONI publishes network measurement data because open data allows third parties to verify OONI findings, conduct independent studies, and answer other research questions. Openly publishing OONI data also helps increase transparency of internet censorship around the world. You can explore and download OONI data here: https://ooni.io/data/
Free software
All OONI Probe tests (including our NDT and DASH implementations), are based on free and open source software. You can find OONI software projects on GitHub: https://github.com/ooni. Curious to learn how OONI Probe tests work? Learn more: https://ooni.io/nettest/
To receive updates from the OONI-verse, follow us on Twitter: https://twitter.com/OpenObservatory
What’s new
Version 6.2.1 · Updated September 28, 2026
We're excited to share that the latest OONI Probe version features a brand new test for RiseupVPN! Thanks to the LEAP collective (who developed this new test), you can now check whether RiseupVPN works on your network.
User reviews
👍
A great way to analyze a network, with lots of results. I've used it to compare different broadband providers, and have found it immeasurably useful as it doesn't just check speed, but also censorship levels and lots more.
OK
Good app
Very useful tool to run periodically. Easy to understand user interface.
I understand the concept and believe it is one application that can provide genuine usable information to support the public and free speech. Recommend this app for the support of your digital privacy and digital privacy of the public as a whole.
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| App | Rating | Price | Installs | Last updated | Compare |
|---|---|---|---|---|---|
| OONI Probe | 4.4 / 5 | Free | 500,000+ | Sep 28, 2026 | |
| Tor Browser (Alpha) | 4.4 / 5 | Free | 5,000,000+ | Oct 1, 2026 | Compare |
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| PrivacyWall | 4.5 / 5 | Free | 1,000,000+ | Aug 2, 2026 | Compare |
| Proton Mail: Encrypted Email | 3.5 / 5 | Free | 10,000,000+ | Sep 21, 2026 | Compare |
| Tor Browser | 4.4 / 5 | Free | 50,000,000+ | – | Compare |
| Private & Secure VPN: TorGuard | 4.5 / 5 | Free | 1,000,000+ | Nov 4, 2025 | Compare |
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