# OONI Probe — Measure Internet Censorship

> Measures internet censorship, network performance, and detects surveillance systems. (iPhone/iPad app by The Tor Project.)

- Source: https://appshunter.io/ios/app/ooni-probe/id1199566366 (this page in markdown: same URL + `.md`)
- Developer: [The Tor Project](https://appshunter.io/developer/1199566365)
- Category: Utilities, Education
- Price: Free
- Rating: 4.50/5 from 84 App Store ratings · 31 written reviews indexed
- Age rating: 4+
- Requires: iOS 14.0 · 138 MB
- Languages: American English, Albanian, Arabic, Bosnian, Burmese, Khmer, Catalan, Dutch, Finnish, French (France) and 19 more
- Released: 2017-02-08
- Data updated: 2026-08-25
- Monetization: free
- User reviews in markdown: https://appshunter.io/ios/app/ooni-probe/id1199566366/reviews.md

## What is 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

## Key features

- 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

## Recent user reviews (10 of 31)

All indexed reviews: https://appshunter.io/ios/app/ooni-probe/id1199566366/reviews.md

### 1/5 — Risky app you don’t really know where it takes your phone.

*2026-08-05*

.Chat gpt suggested this app to me  I think AI is trying to frame me 😊

### 1/5 — Crashes

*2026-04-20*

The app only exits when run.
iPad Mini 5

### 1/5 — Dangerous app

*2026-01-02*

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.

### 1/5 — Horrendously slow

*2025-11-12*

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

### 3/5 — Needs sites update

*2025-11-03*

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

### 5/5 — App works well

*2024-04-01*

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!

### 4/5 — Crashing Problems

*2023-08-27*

1) During tests, specifically website tests, it crashes sometime in the middle, after about 300 sites. Time limit was turned off. iPad Air iOS 12.5.7

2) Page of categories of websites. Ellipses on top right always causes a crash. On this iPad and a newer one too. 

The premise is good, but the constant crashing is a bummer.

3) Needs a landscape view orientation.

### 3/5 — Developers

*2023-08-21*

Need more attention from developers to track and find open ports and … thing’s for vpn companies and make internet more free of filtering

### 5/5 — Works well

*2022-06-27, version 3.6.1*

Works well on iOS. Great design good UX. Good for accessibility.

### 1/5 — Crashing

*2021-02-06*

Still crashing on 12.5.1

## Frequently asked questions about OONI Probe

### 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.

## Version history (last 5 releases)

### 6.2.0 — 2026-08-12

* Measurement engine v3.30.0
* Enhanced offline handling and retry mechanisms
* Bug fixes and improvements

### 6.1.1 — 2026-07-01

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

### 6.1.0 — 2026-06-23

* Measurement engine is OONI Probe CLI v3.29.0
* Add support for anonymous credentials
* Bug fixes and improvements

### 6.0.2 — 2026-05-26

* Measurement engine is OONI Probe CLI v3.29.0
* Cleaner UI for results with errors
* Updated translations (Japanese, Greek, Portuguese, German, Chinese)
* Bug fixes and improvements

### 6.0.1 — 2026-03-18

* Measurement engine is OONI Probe CLI v3.29.0
* Fix auto-run issue preventing OONI tests from running

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## More apps by The Tor Project

- [Orbot](https://appshunter.io/ios/app/orbot/id1609461599)

All apps by The Tor Project: https://appshunter.io/developer/1199566365

## Related topics

[ooni probe](https://appshunter.io/ios/topics/ooni-probe) · [ooni](https://appshunter.io/ios/topics/ooni)

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*Data collected daily from the US App Store and indexed by [AppsHunter](https://appshunter.io/). User reviews are verbatim App Store reviews. Ratings, prices and chart positions refresh continuously; this snapshot is from 2026-08-25.*