KinetFit-How old is your body? Find out offline.

Hi Product Hunt! 👋

I'm the solo developer behind KinetFit.

I built it because I was tired of two things: fitness apps that only tell you to "train harder," and health apps that upload every heartbeat to the cloud.

KinetFit flips both. First it asks a different question — how old is your body, really? Ten tests give you a single number: your fitness age, plus where you rank among your peers. Then it trains you by recovery, not by a fixed schedule. Retest in a few weeks and watch the number drop.

And all of that runs on your phone's chip. The AI is on-device, fully offline, 0 uploads. No accounts, no telemetry. Not a privacy promise — there's structurally no server to upload to.

It's a one-time purchase. No subscription, ever — I hated that subscriptions became the default for every health app.

I'd love your feedback — especially on the fitness-age methodology and the on-device model tradeoff. What would make this your daily fitness check? 🙏