[coffeeri]

Even better is https://simpletex.cn/

[Bimos]

I'm a native Chinese speaker. I knew Detexify and used it a lot. This is the first time I see this software. I tried with hand written \succeq, and until its anti-crawler mechanism is triggered, it fails to give the answer. You can argue it is a software with a different purpose (e.g. to convert a piece of content rather than a single symbol), but to me it is not "even better" than detexify.