[jeffshek]

I wrote https://betterself.io (open-sourced) to figure this out for myself. After analyzing a year's worth of supplements and habits -- meditation at the start of my day had the highest correlation of productivity beating out any supplement I bought (I tried about 70+ supplements last year).

[SomewhatLikely]

Any other useful correlations? Also a note on the page linked: it's not clear to me whether I need another app collecting the data or if I will need to directly enter it in your app.