Blocky, launched by GreatFire.org in 2011, is a free tool that allows you to test whether a website is blocked by the Great Firewall of China (GFW) and view historical data of testing results. With Blocky, you can easily submit domains to check their accessibility, making it a valuable resource for testing and measuring website blocking within the GFW.

The Great Firewall blocks thousands of URLs. Blocky provides a comprehensive overview of its database, where you can click on any entry to see detailed information about when a website was blocked or unblocked. All datasets are freely available for academic purposes. Contact us more information.