WHOOP charges $219 for a band you must wear 24/7, then $349/yr to use it — with a 12-month lock-in. Kreev works with the Apple Watch already on your wrist.
Hardware + subscription, year one. No hidden fees.
Kreev: free forever, Sentinel $39.99/yr — no hardware required. WHOOP: Band ~$219 + $349/yr membership. 12-month minimum commitment.
| Feature | Kreev | WHOOP |
|---|---|---|
| Hardware Cost | $0 | ~$219 (band required) |
| Monthly Cost | $5.99/mo | $29/mo |
| Commitment | Cancel anytime | 12-month minimum |
| Works with Apple Watch | ✓ Yes | ✕ No |
| Recovery Score | ✓ | ✓ |
| Personal Baseline (Z-Score) | ✓ | ✕ Population average |
| Algorithm Transparency | Published | Black box |
| AI-Powered Insights | Daily narrative | Coaching tips |
| Free Tier | ✓ forever | ✕ |
| Trial | 30 days Sentinel, no card | ✕ |
| Data Privacy | Named vendors, no ads | Standard policy |
WHOOP requires you to buy their proprietary band and commit to 12 months. Kreev uses the Apple Watch you already own — no new hardware, no annual contract.
WHOOP benchmarks your recovery against population data. Kreev uses Z-score statistics against your own rolling history — so your score reflects how you are doing compared to your normal.
WHOOP gives you a number without showing its work. Kreev publishes its methodology and generates a plain-language AI narrative every morning explaining exactly why your score is what it is.
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