Tacet

Tacet wants to be the brain monitor for your cognitive health—think of it like a fitness tracker but for your mind. Track your mental sharpness, monitor your cognitive scores over time, and apparently know things about your brain health you'd never guess from just feeling "fine." It's on Product Hunt, which means early traction and interest from the productivity and biohacking crowd, but that's about all we know outside the product description itself.

The cognitive wellness space is getting crowded with brain training apps and nootropics pushed by tech billionaires who think they'll live forever. Tacet's angle is the monitoring side—which is smart, because you can't improve what you don't measure. Whether they've got real neurological metrics or just gamified quizzes remains to be seen, but "brain monitor" is a bold claim that better have science behind it.