WHOOP wants you to buy a band. Oura wants you to buy a ring. Kreev just needs the Apple Watch you're already wearing.
Hardware + subscription for your first year. No hidden fees.
Kreev: free to start, Sentinel $5.99/mo or $39.99/yr — no hardware required. Oura: Ring 4 $349 (Silver/Black) or $499 (Gold/Ceramic) + $5.99/mo or $69.99/yr membership — first 12 months of membership included free. WHOOP: $199–$359/yr membership, band included — no separate hardware charge.
WHOOP pricing per whoop.com/membership; Oura pricing cross-checked against public review sites — both as of Sept 2026. Re-check before publishing.
| Feature | Kreev | WHOOP | Oura |
|---|---|---|---|
| Additional Hardware Cost | $0 — uses the Apple Watch you own | $0 — band included with membership | $349–$499 (ring required) |
| Subscription | $5.99/mo or $39.99/yr | $199–$359/yr depending on tier | $5.99/mo or $69.99/yr (first 12 months free) |
| Year-One Cost | $39.99 | $199–$359 | ~$349 (membership free year one) |
| Recovery Score | ✓ | ✓ | ✓ |
| Personal Baseline (Z-Score) | ✓ | ✕ | ✕ |
| Algorithm Transparency | Published | Black box | Black box |
| Plain-Language Insights | Daily narrative, generated on-device | Coaching tips | Basic summaries |
| Additional Hardware | None — Apple Watch | WHOOP band required | Oura Ring required |
| On Your Wrist | Watch app + 5 complications, updated in the background | Own band, worn on wrist | N/A — worn on finger, not wrist |
| Data Privacy | Kreev's watch app can't even read Apple Health — your iPhone computes your scores and sends only the finished numbers to your watch, over Apple's own encrypted connection | Standard policy | Standard policy |
| Commitment | Cancel anytime | Annual membership; the band stops working when it lapses | Cancel anytime |
| Free Tier | Yes | ✕ | ✕ |
| Trial | 1-month Sentinel App Store trial | Varies | Varies |
WHOOP and Oura compare you to population averages. Kreev uses Z-score statistics against your own historical data. An elite athlete at 42 bpm and a weekend jogger at 72 bpm both get accurate, meaningful scores.
Other platforms give you a number and ask you to trust it. Kreev publishes its scoring methodology and explains every score with a plain-language narrative generated on your phone. No black boxes.
WHOOP costs $199–$359/yr in membership alone. Oura costs $349+ for a ring, plus membership after the first year. Kreev costs nothing extra — it uses the Apple Watch sensors you already have. Free to start; Sentinel is $5.99/mo or $39.99/yr.
WHOOP, Oura and Garmin hold your health data on their servers. Kreev has no server — your data lives on your iPhone and nowhere else.
See how Kreev stacks up against each platform, feature by feature.
$219 band + 12-month lock-in vs the Apple Watch you already own. No contracts, no proprietary hardware.
See full comparison →
$349+ ring before you can access a single metric. Kreev works with HealthKit — no upfront hardware cost.
See full comparison →
Body Battery compares you to population norms and explains nothing. Kreev is built for Apple Watch with personal baseline scoring and full plain-language narratives.
See full comparison →
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