POLAR
Pick Polar if
- Chest-strap HRV during training matters
- Recovery score + training load drive decisions
- You're not waiting for a Garmin OAuth flip
Polar vs Garmin
Polar's recovery and training load science is excellent. Garmin reads more signals: Body Battery, 24/7 stress, floors, ECG. Polar wins on chest-strap HRV accuracy; Garmin wins on signal breadth and battery life.
POLAR
17/27API signals exposed
Sport watch / chest strap
vs
GARMIN
20/27API signals exposed
Athletic / outdoor watch
QUICK VERDICT
Both brands target athletes. The decision comes down to depth versus breadth. Polar reads 17 of 27 signals with chest-strap-grade accuracy on HRV and recovery (when paired with H10). Garmin reads 20 of 27 different signals — Body Battery, 24/7 stress, ECG, floors — but HRV only from the optical sensor during sleep. If you train by HRV, Polar. If you live by Body Battery, Garmin.
COVERAGE BY CATEGORY
Where each brand actually wins
Per-category breakdown of API signals.
SIGNAL BY SIGNAL
The full matrix
| Signal | Polar | Garmin |
|---|---|---|
| Heart & Vitals | ||
| Resting HR | ✓ | ✓ |
| HRV | ✓ | ✓ |
| SpO2 | ✓ | ✓ |
| Respiratory Rate | ✓ | ✓ |
| Skin Temperature | ✓ | ✓ |
| Body Temperature | — | — |
| Blood Pressure | — | — |
| ECG · AFib | — | ✓ |
| Sleep | ||
| Sleep duration | ✓ | ✓ |
| Sleep stages | ✓ | ✓ |
| Sleep score | ✓ | ✓ |
| Activity | ||
| Steps | ✓ | ✓ |
| Active minutes | ✓ | ✓ |
| Calories | ✓ | ✓ |
| Activities | ✓ | ✓ |
| Floors climbed | — | ✓ |
| Distance | ✓ | ✓ |
| Fitness & Recovery | ||
| VO2max | ✓ | ✓ |
| Training load | ✓ | ✓ |
| Recovery / Readiness | ✓ | ✓ |
| Body Battery | — | ✓ |
| Stress (continuous) | — | ✓ |
| Cardiovascular age | — | — |
| Body Composition | ||
| Weight | ✓ | — |
| Body fat % | — | — |
| Muscle mass | — | — |
| Hydration | — | — |
Verified against vendor developer documentation.
WHICH ONE FOR YOU
Pick the one that matches your priority
GARMIN
Pick Garmin if
- Body Battery and 24/7 stress matter
- Multi-day battery and outdoor GPS matter
- You want ECG + AFib + floors covered
POLAR+GARMIN
Pick both if
- Garmin watch on the wrist 24/7
- Polar H10 chest strap during structured workouts
- MyBodyAI merges both feeds with richer-source-wins
FAQ
Frequently asked questions
Should I choose Polar or Garmin?
For most people it is one or the other. Both are daily-wear devices that track the same core things, heart rate, sleep and activity, so wearing both is redundant. Use the matrix above to pick the one that wins the categories you care about.
Which one tracks more health signals?
Polar tracks 17 of the 27 signals I compare, Garmin tracks 20. The matrix above breaks it down by category, and they often win different categories.
Is it worth switching from Polar to Garmin?
Only if Garmin wins the categories you actually care about. If you already own Polar and it covers your main goal, the upgrade is rarely worth it. The matrix above shows exactly what changes.
How did you compare Polar and Garmin?
From each brand's official spec sheets and support pages, cross-checked against independent reviews like DC Rainmaker and The Quantified Scientist and peer-reviewed accuracy studies. Signal-level edge cases are noted in the matrix, not hidden behind a single check mark.
WHERE TO BUY
Check prices at the source
Direct links to each vendor's store. No affiliate links.
- POLAR Official store Check at Polar →
- GARMIN Official store Check at Garmin →
MORE COMPARISONS
Explore other pairs
OPTIONAL — IF YOU WANT MORE
Want one place that merges both feeds?
MyBodyAI merges these signals into Biological Age, Recovery and 9 other indices.
Try MyBodyAI free →