Unit of analysis
- Apple Health
- Single metric vs personal trend
- Bevel
- Daily composite score
- Sam
- Multivariate trajectory across days
Comparison
A readiness score sees one bad night. Sam sees the four-night drift that one bad night is hiding.
What Bevel does well
Bevel's readiness score is more sophisticated than a single-metric threshold. It weights HRV, sleep, recovery, and strain into a combined daily number tuned to your own history - a real multi-signal composite, not just a population norm.
So the honest framing isn't "Sam personalizes, Bevel doesn't." Both do. The difference is narrower - and once you see it, harder to replicate.
Where Sam goes further
Bevel's readiness score is a daily recompute: every morning, your signals get weighted into one number. That number is good for answering "how am I today" - it can't, by construction, distinguish "two beers last night" from "respiratory rate has crept up 0.4/min over four nights while HRV softened." Both look like a lower readiness score. Sam is built to read the multi-day shape and tell those apart.
A readiness score is, mechanically, a weighted combination of threshold-style signals. Sam is built around learned anomaly detection across the signal trajectory - does this multivariate pattern match shapes that historically preceded a change. It's a different kind of question than "what's my composite today," and a competitor can't ship it by retuning weights.
A factual comparison of how each product reads your data.
| Dimension | Apple Health | Bevel | Sam |
|---|---|---|---|
| Unit of analysis | Single metric vs personal trend | Daily composite score | Multivariate trajectory across days |
| Baseline | 90-day vs 365-day per metric | Weighted multi-signal personal baseline | Personal pattern across HRV, sleep, respiratory |
| Detection method | Statistical thresholds | Weighted threshold composite | Learned anomaly detection |
| Signals combined together | No (per-metric trends) | Yes (composite score) | Yes - and over time |
| Time horizon | Day-level | Day-level snapshot | Multi-month pattern |
| Notifications when something drifts | Per-metric trend alerts (opt-in) | Score change | Heads-up notifications keyed to the pattern |
| Platform | iOS (built-in) | iOS app | iOS app (Apple Watch) |
| Data residency | Apple servers (US) | US-based; no stated EU residency | EU, GDPR-native |
| Price | Free | Freemium (Pro $14.99/mo or $99.99/yr) | Free |
| Guided programs (sleep, stress, movement) | No | Limited | Yes |
Bevel pricing and feature scope reflect the App Store listing and bevel.health as of May 2026. Apple Health Trends behavior is documented by Apple. Competitor products may have changed since this date.
The short version
A readiness score sees one bad night. Sam sees the four-night drift that one bad night is hiding.
That line concedes what Bevel actually does - read your personal baseline well. It just names what their unit of analysis is: the day and the score. Sam's is the pattern across days. That's the part that's hard to add later.
Free. iOS. Built in Europe. Reads from HealthKit - your existing baseline travels with you.