Would you use a workout tracker with no subscription and full data export?

I’m still in school and build small things with Claude Code. My own workout log lives in a spreadsheet right now, it’s fine, but logging a set mid-workout on my phone is clunky, and Strong/Hevy solve that but lock your data behind a subscription. The free trackers I’ve tried don’t export at all.

Considering building one thing well: fast mobile logging, full CSV/JSON export, $39 once, no subscription ever.

Nothing exists yet, just this idea and a waitlist (link below). Would genuinely rather kill it now than after a month of building, so tell me if this is dumb.

If you already track workouts: what do you use, what’s actually annoying about it?

https://setflash-waitlist.vercel.app