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:

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: Curious to learn how OONI Probe tests work? Learn more:

To receive updates from the OONI-verse, follow us on Twitter:

From version OONI Probe 3.7.0:

- New Vanila Tor experiment
- Added In App Language Selection
- Add support for sharing a link to the OONI Probe app
- Measurement engine synced with OONI Probe CLI 3.15.2
- Bug fixes and improvements.

All versions
OONI Probe 3.7.0


Uploaded:July 13, 2022 at 3:12PM UTC

File size:7.64 MB


OONI Probe 3.6.0
February 28, 2022


Uploaded:February 28, 2022 at 6:32PM UTC

File size:7.68 MB


OONI Probe 3.5.0
December 17, 2021


Uploaded:December 17, 2021 at 3:44PM UTC

File size:7.67 MB


OONI Probe 3.4.1
November 26, 2021


Uploaded:November 26, 2021 at 6:02PM UTC

File size:7.67 MB


OONI Probe 3.4.0
November 18, 2021


Uploaded:November 18, 2021 at 4:29PM UTC

File size:7.67 MB


OONI Probe 3.3.1
October 4, 2021


Uploaded:October 4, 2021 at 8:26PM UTC

File size:7.4 MB


OONI Probe 3.3.0
September 20, 2021


Uploaded:September 20, 2021 at 6:14PM UTC

File size:7.4 MB


OONI Probe 3.2.0


Uploaded:July 26, 2021 at 11:18AM UTC

File size:7.29 MB


OONI Probe 3.1.0


Uploaded:July 21, 2021 at 3:45AM UTC

File size:7.15 MB


OONI Probe 3.0.0


Uploaded:May 27, 2021 at 1:22PM UTC

File size:7.15 MB