The Open Observatory of Network Interference (OONI) project offers OONI Probe, a free software designed to identify censorship, surveillance, and manipulation of internet traffic. Users can contribute to the project by running tests through the OONI Probe app, which measures various aspects of network interference. This includes detecting website blocking, identifying systems responsible for censorship or surveillance, assessing network speed and performance, and uncovering restrictions on instant messaging apps, circumvention tools, and major content platforms. Tests conducted by OONI Probe encompass handshakes, checks for DNS and HTTP blocking, and detection of middleboxes capable of modifying or censoring web traffic. The project provides tools like OONI Explorer and the OONI API, enabling the public to monitor censorship events worldwide in real-time mode.

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