There are some in existence already:

- quantifiedmind.com for self-testing your mind, which has a few group experiments as well. I'm looking into integrating with them as part of doubleblinded.com.

- PACO (by Google) https://www.pacoapp.com/ Pretty cool and flexible platform, although not the most user friendly or easy to figure out. It is open source and has an app, which is cool.

- A few sites like 23andme and ubiome have a lengthy list of survey questions they ask you, which I only imagine they would pass through pattern recognition algorthms to detect correlations between whatever information you give them and your Genome (or gut genome in the case of 23andme).

So yeah, there is stuff out there. We want to do this for nootropics and supplements (and eventually much more).