Needs work. I just tried something basic like “can I mix 2CB and viagra” and it couldn’t give an answer. Where is it finding it’s source info?
The main sources are TripSit and PsychoautWiki.
It also contains all the test results from /r/ReagentTesting/wiki So you'll definitely have a huge database at your disposal for drug checking.
There’s also tripsit with real people. Though I like this bit more. It explains why not to mix drugs not just you shouldn’t. This allows to make informed decisions. Compared to people just telling us not to.
It's mostly useful as a quick reference guide in my experience
This should have Signal!
A community of mature and well-intentioned recreational drug enthusiasts.