Wear Radar

Garmin Forerunner 570vsFitbit Air

11d vs 7d
battery life
Garmin Forerunner 570 lasts longer
$450
price gap
Fitbit Air cheaper
0.5 Hz
HR sampling
Fitbit Air only — Garmin Forerunner 570 undisclosed
30g
lighter
Fitbit Air
Garmin Forerunner 570
Buy/Wait:good

Early in release cycle

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Fitbit Air
Buy/Wait:good

First-generation product — no historical cycle data to predict a successor

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Garmin Forerunner 570Fitbit Air
Pricing
Starting price$549$99
Subscriptionℹ️ Optional — $70/yrℹ️ Optional — $99/yr
Hardware
Weight42g12g
Water resistance5ATM50m
Battery11 days7 days
Always-on display
GPS
Cellular
PlatformiOS & AndroidiOS & Android
TierSports GPSFitness Tracker
Buy timing
ReleasedMay 15, 2025May 7, 2026
Cycle advicegoodgood
Deals adviceneutralgood
Next model

Health Sensors

Garmin Forerunner 570 only
3 exclusive sensors
Stress TrackingStress estimate from HRV and physiological signals
Body BatteryGarmin's energy reserve — how much fuel left in the tank
Training ReadinessDaily recovery score — how ready you are to perform
Both
4 shared
Heart RateContinuous or on-demand pulse tracking
SpO2Blood oxygen saturation, tracked during sleep
HRVHeart rate variability — stress & recovery scores
Skin TempOvernight changes linked to illness or cycle tracking
Fitbit Air only
1 exclusive sensor
Irregular RhythmBackground optical check for irregular heart rhythms

Why buy each?

Garmin Forerunner 570

Multi-band GPS and Elevate Gen 5 sensor

L1+L5 dual-frequency GPS for precise tracking in cities and trails, paired with Garmin's most advanced heart rate sensor — adding skin temperature monitoring over the FR265.

Built-in speaker and microphone

A first for this price tier — take phone calls, use voice assistant, and hear Bluetooth audio directly from your wrist. A meaningful upgrade over the silent FR265.

Garmin Triathlon Coach

AI-powered triathlon training plans that adapt to your swim, bike, and run fitness — a key differentiator over the FR265 for multisport athletes.

Fitbit Air

$99 with no subscription

Unlike WHOOP, there is no mandatory membership — pay $99 once and use Fitbit Air with the free Google Health app. Google Health Premium ($9.99/month) is optional.

24/7 health monitoring in 12 grams

Continuous heart rate, SpO2, HRV, and skin temperature tracking plus background FDA-certified AFib detection, in a 12g pebble designed to be worn and forgotten.

7-day battery with 5-minute fast charge

A week between charges, with a 5-minute top-up delivering a full day of use — significantly less downtime than WHOOP's slide-on charging system.

Quick Winner

The right pick depends on what you optimize for.

For the budget
Fitbit Air wins

$396 vs $759 over 3 years · no required subscription.

For battery life
Garmin Forerunner 570 wins

11 days vs 7 days battery.

For health depth
Garmin Forerunner 570 wins

7 sensors.

For daily comfort
Fitbit Air wins

12g · no required subscription.

Bottom Line

Technical gaps
  1. Forerunner 570-only sensors: Stress Tracking, Body Battery, Training Readiness.
  2. Air-only sensors: Irregular Rhythm.
  3. Weight. Air is 30g lighter — relevant for all-day comfort and sleep.
Commercial gaps
  1. Hardware cost. Air is $450 cheaper upfront ($99 vs $549).
Pick the Garmin Forerunner 570 if…

Regular runners and triathletes who race 5K to marathon distances and want accurate multi-band GPS, detailed training load management, and Triathlon Coach structured plans. The speaker and microphone make it a more capable daily-wear watch than the FR265 it replaces.

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Pick the Fitbit Air if…

Health-focused users who want passive, 24/7 biometric tracking without a screen on their wrist. Particularly strong for those drawn to WHOOP but put off by the subscription model — the Fitbit Air delivers comparable core health data for $99 outright. Works with both iOS and Android.

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