Wearable comparison
Compare wearables by what they actually measure.
Watches, rings, straps and smart scales, compared by what each one actually measures. Start with a brand, or switch to every device and filter.
- 111devices
- 9brands
- 33signals
Updated 19 July 2026 · independent spec audit
Browse by brand
Each brand page opens its full line-up, with the signals it tracks and how well.
Buying for battery life? See every device ranked by battery life
Longer reads: HRV accuracy: Oura vs Garmin vs Polar vs Fitbit vs Withings Garmin fenix 9: three models, not one new sensor Amazfit Bip 6 review: $79.99, 14-day battery, no ECG
Widest coverage per goal
How much of each goal's signal set a device tracks, among the devices still sold. The signal counts come from the catalog; which categories weigh how much for a goal is my call, and the goal filter in the tool above uses the same weights. It measures coverage, not accuracy.
- Better sleep: Withings ScanWatch 2, Withings ScanWatch Nova and Withings ScanWatch Nova Brilliant tie on coverage.
- Endurance training: Garmin Enduro 3, Garmin Forerunner 970, Garmin Venu 4, Garmin fenix 7 Pro (47mm), 6 devices in total tie on coverage.
- Recovery: WHOOP MG.
- Heart & clinical: WHOOP MG.
- Longevity & health: Amazfit Balance and Amazfit Balance 2 tie on coverage.
Broader coverage does not mean better readings. The accuracy grade next to each signal on a device page comes from the spec audit and independent testing.
How this is checked
Spec sheets and independent tests, not marketing claims
Capabilities come from each brand's official spec sheets and support pages, cross-checked against independent hands-on reviews (DC Rainmaker, the5krunner, Tom's Guide). Every device page lists the sources it was built from. This comparison is published by MyBodyAI but the data and picks come from the spec audit, not from any commercial arrangement.
Head-to-head comparisons: Amazfit vs COROS Amazfit vs Fitbit Amazfit vs Garmin Amazfit vs Oura Amazfit vs Polar Amazfit vs Suunto Amazfit vs WHOOP Amazfit vs Withings COROS vs Garmin COROS vs Polar Fitbit vs Garmin Fitbit vs Withings Oura vs Fitbit Oura vs Garmin Oura vs WHOOP Polar vs Fitbit Polar vs Garmin Polar vs Withings Suunto vs Garmin WHOOP vs Fitbit WHOOP vs Garmin Withings vs Garmin
Frequently asked
How many devices does this comparison cover?
111 devices from 9 brands: watches, armbands, smart scales, rings, blood-pressure monitors, chest straps, handheld monitors and sleep mats. 100 of them are still sold new. Discontinued models stay in the catalog, labelled, because people still wear them.
Which device measures the most health signals?
9 models tie at 21 of the 33 signals in the matrix: Fitbit Sense 2, Fitbit Google Pixel Watch 3, Fitbit Google Pixel Watch 4, Garmin Enduro 3, Garmin Forerunner 970, Garmin Venu 4, Garmin fenix 7 Pro (47mm), Garmin fenix 8 (AMOLED, 47mm), Garmin fenix 8 Pro (AMOLED, 47mm). That is breadth, not quality: a chest strap that only reads heart rate can still read it more accurately than a watch that reports 21 things.
Does more signals mean more accurate?
No. Each signal on a device page carries its own grade (clinical grade, high accuracy, consumer). The grade says which class of sensor the reading comes from: medically certified hardware, a chest strap or dedicated monitor, or a wrist optical sensor. It is my classification, not a lab test of that model, and it does not follow the feature count.
Where do the numbers come from?
From each brand's official spec sheets and support pages, cross-checked against independent hands-on reviews (DC Rainmaker, the5krunner, Tom's Guide). Every device page lists its own sources. Where a spec is not published, the page says so instead of estimating.
Are there affiliate links or paid placements here?
There are no paid placements. Some shop links are affiliate links: if you buy through one, I may earn a commission at no extra cost to you, and it never changes a pick or a spec. Prices are indicative US list prices; a device with no published price is marked as not yet known rather than guessed.
Does MyBodyAI work with these devices?
MyBodyAI turns wearable data into daily health scores, and the wearables it can read are listed on the devices page. The comparison is independent of that: a device is listed here on its specs, whether or not we can read its data.
Which smartwatch lasts longest on a charge?
Suunto Vertical, at 60 days in smartwatch mode, the longest of the 69 watches still sold here. Those are the makers' own smartwatch-mode figures: GPS, always-on displays and daily SpO2 all cut them, so read the number as a ceiling. The full ranking, including the rings and straps that outlast every watch, is on the battery page.
Which wearables can record an ECG?
24 devices still sold, from Fitbit, Garmin, Polar, WHOOP, Withings. Recording a trace and screening for atrial fibrillation are two different features and the catalog counts them separately: 20 devices flag AFib, while 5 record the trace without judging the rhythm for you (Polar Grit X2, Polar Grit X2 Pro, Polar Vantage M3, Polar Vantage V3, Withings BeamO).
Which wearables measure blood pressure?
5, and 4 of them are cuffs: Garmin Index BPM, Withings BPM Connect, Withings BPM Core, Withings BPM Vision. WHOOP MG estimates it optically from the wrist as a beta feature, which is a different measurement, not a smaller one. Nothing else in the catalog reports blood pressure at all.
Do any of these need a subscription?
6 of the 100 devices still sold: Garmin fenix 8 Pro (AMOLED, 47mm), Oura Ring 4, Oura Ring 4 Ceramic, Oura Ring 5, WHOOP 5.0, WHOOP MG. The rest are listed as not requiring one; where a maker also sells an optional paid tier, the device page names it.
Every device in the comparison
The whole catalog by brand. A device page lists what it measures, how each signal is graded, battery, water rating, GPS and the indicative price.
Amazfit
- Amazfit Active 2
- Amazfit Active 3 Premium
- Amazfit Active Max
- Amazfit Balance
- Amazfit Balance 2
- Amazfit Balance 3
- Amazfit Balance Ultra
- Amazfit Bip 6
- Amazfit Bip Max
- Amazfit Cheetah 2 Pro
- Amazfit Cheetah 2 Ultra
- Amazfit Helio Ring
- Amazfit Helio Strap
- Amazfit Helio Strap Pro
- Amazfit T-Rex 3
- Amazfit T-Rex 3 Pro
- Amazfit T-Rex Ultra 2
- Amazfit Cheetah Prodiscontinued
- Amazfit GTR 4discontinued
Garmin
- Garmin CIRQA Smart Band
- Garmin Enduro 3
- Garmin Forerunner 165
- Garmin Forerunner 170
- Garmin Forerunner 255
- Garmin Forerunner 265
- Garmin Forerunner 570 (47mm)
- Garmin Forerunner 70
- Garmin Forerunner 955 Solar
- Garmin Forerunner 965
- Garmin Forerunner 970
- Garmin HRM 600
- Garmin Index BPM
- Garmin Index S2
- Garmin Index Sleep Monitor
- Garmin Instinct 3 (AMOLED, 45mm)
- Garmin Instinct 3 (Solar, 50mm)
- Garmin Instinct Crossover AMOLED
- Garmin Instinct E (45mm)
- Garmin Lily 2
- Garmin Venu 3
- Garmin Venu 4
- Garmin Venu X1
- Garmin fenix 7 Pro (47mm)
- Garmin fenix 8 (AMOLED, 47mm)
- Garmin fenix 8 Pro (AMOLED, 47mm)
- Garmin vivoactive 5
- Garmin vivoactive 6
- Garmin epix Pro (Gen 2), 47mmdiscontinued
Oura
- Oura Ring 4
- Oura Ring 4 Ceramic
- Oura Ring 5
- Oura Ring 3 Heritagediscontinued
- Oura Ring 3 Horizondiscontinued
- Oura Ring Gen2discontinued
Turn a supported wearable into daily health scores
MyBodyAI reads Fitbit, Oura, Polar and Withings by logging in, and Garmin from a data export, then builds daily recovery, sleep, load and immune scores, a biological age estimate, and early warnings. Optional, and separate from this comparison.
Try MyBodyAI
This comparison is free and ad-free. I build and update it on my own. If it saved you hours of research, a coffee genuinely makes my day.
Buy me a coffee