Pick the wearable that measures what you actually care about.
9 brands, 27 signals, checked independently — no marketing, just what each device really measures.
Krátká odpověď nejdřív
One crowned pick per use case, plus the best all-rounder.
The broadest column in the matrix below — Body Battery, 24/7 stress, sleep stages, ECG and floors.
Read Fitbit vs Garmin →
A ring you sleep with without wrist irritation — sleep stages, SpO2, temperature and cardiovascular age.
Read Oura vs WHOOP →
The only brand reading HRV from a chest-strap-grade sensor — accurate even under hard intervals.
Read Polar vs Garmin →
A screenless strap built around strain, recovery and 24/7 HRV — nothing to read or charge by day.
Read Oura vs WHOOP →
Lowest price of the nine, yet still reads daily HRV, 24/7 stress, SpO2 and a BioCharge readiness score.
Read Amazfit vs Fitbit →Co která značka měří
Yes = the device measures and surfaces the signal. — = the hardware does not measure it.
| Signal | Polar | Fitbit | Withings | Garmin | Oura | WHOOP | Suunto | COROS | Amazfit |
|---|---|---|---|---|---|---|---|---|---|
| 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 | — | — | — | ✓ | ✓ | — | — | — | ✓ |
| Cardiovascular age | — | — | — | — | ✓ | — | — | — | — |
| Body Composition | |||||||||
| Weight | ✓ | ✓ | ✓ | — | — | ✓ | — | — | — |
| Body fat % | — | — | ✓ | — | — | — | — | — | — |
| Muscle mass | — | — | ✓ | — | — | — | — | — | — |
| Hydration | — | — | ✓ | — | — | — | — | — | — |
| Signals measured | 17 | 16 | 20 | 20 | 17 | 14 | 15 | 15 | 16 |
Out of 27 tracked signals. Breadth, not quality.
Jak srovnání vzniklo
Every brand was checked against its official spec sheet, its support pages, and its developer documentation. The matrix tracks what the hardware itself can measure — not what an app exposes.
Where specs and docs disagreed, I broke the tie with independent reviews and peer-reviewed studies. Edge cases are footnoted in the pair pages, not hidden behind a single Yes / No.
What's not here: no paid placements and no sponsored winners. The winning brand has the strongest measurable case — not the best affiliate rate.
Šest nejotevíranějších srovnání
Each pair page opens the full verdict and signal coverage.
Přejděte rovnou na značku nebo použití
Podle značky — otevře všechny modely v nástroji
Or open the full tool: 71 devices, filter & compare up to 4 →
Podle použití
Časté dotazy
How did you test these wearables?
Vendor specs + dev docs + DC Rainmaker + The Quantified Scientist + PubMed studies.
How often is this updated?
Re-checked when a vendor updates a product line. Last full revision: 2026-05-23.
Which wearable is the best overall?
There is no single best — different brands win different categories.
Can I use more than one device at once?
Yes. Each device covers what the others miss.
Do I need a chest strap or a ring, or is a watch enough?
A watch suits most people; a chest strap is best for HRV, a ring for sleep without a watch.
What if my device isn't listed?
Email info@aiclysm.com with brand and model.
Chcete jedno místo, kde se vše spojí dohromady?
MyBodyAI derives Biological Age, Recovery, Stress Load and 9 other indices from the raw numbers. Optional — the comparison above stands on its own.
Try MyBodyAI free →
This comparison is free and ad-free. If it helped, a small coffee keeps it that way.