I just canceled my $199 / year WHOOP subscription, and…
reverse-engineered their entire app for my Apple Watch with Opus 5.5 in 2 hours, then i made it open-source:
→ https://github.com/0xCodez/pulsr
recovery. strain. sleep. one beating orb. free and open-source.
what it does:
→ Recovery 0–100% from your overnight HRV, resting heart rate and sleep
→ Strain 0-21 with a daily target based on your recovery
→ how much sleep you need tonight + a recommended bedtime
→ stress monitor, health monitor and a “body age” estimate
→ a journal that shows which habits help or hurt your recovery
→ an AI coach that runs on-device. no API key
→ an Apple Watch app, light and dark mode
→ no subscription, no account. your data never leaves your iPhone
Find full prompt below ↓
Then, read how to rebuild any app from scratch with Opus 5.5 in the article below.