Ignite 3
Polar Ignite 3 is a watch from 2022, sitting in the mid-range band at an indicative $399.
It reads 16 of the 33 signals this comparison tracks. Nothing at all from body composition. Rarer readings it does take: sleep efficiency.
By sensor class: 5 at high accuracy and 4 at consumer grade. That grade is my classification of the hardware, not a lab test. Those readings come from an optical heart rate sensor, a skin temperature sensor, a GPS receiver and an accelerometer.
Its 5 days per charge are the 75th longest of the 80 devices of its kind here that publish a figure. The AMOLED screen can stay always on. Multi-band GPS. Rated WR30 / 30m, fine for swimming. It weighs 35 g. Case size 43mm. No subscription is required.
Fitness/wellness; AMOLED, multiband GPS, nightly skin-temp (per Polar spec page); no SpO2/baro/ECG.
Key specs
What it tracks
Heart & vitals
Sleep
Activity
Fitness
Buying for battery life? See every device ranked by battery life
Your wearable's data, read against your own normal
MyBodyAI reads COROS, Garmin, Oura, Polar and Withings by logging in, and Fitbit and Pixel Watch through Google Health. Older Garmin history comes from a data export. It learns how you usually sleep and what your resting heart rate usually is, and every day shows where you stand against yourself: recovery, sleep, load and immune scores, a biological age estimate and early warnings. Optional, and separate from this comparison.
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