Recently we've been working with people based in China, which isn't always easy since the country blocks a lot of websites
Since most of our tools (software) is delivered aaS (as a service), it's important for us to know if a website is accessible in China before we make a decision.
We've been using this webiste to check if a website is accessible in China
https://www.comparitech.com/privacy-security-tools/blockedinchina