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Polar Grit XvsGarmin Forerunner 570

40d vs 11d
battery life
Polar Grit X lasts longer
$200
price gap
Garmin Forerunner 570 cheaper
15g
lighter
Garmin Forerunner 570
3
more health sensors
Garmin Forerunner 570
Polar Grit X
Buy/Wait:bad

Late in cycle — a new model is likely coming

Full details →
Garmin Forerunner 570
Buy/Wait:good

Early in release cycle

Full details →
Polar Grit XGarmin Forerunner 570
Pricing
Starting price$749$549★
Subscription✓ Noneℹ️ Optional — $70/yr
Hardware
Weight57g42g★
Water resistance100m★5ATM
Battery40 days★11 days
Always-on display❌❌
GPS✅✅
Cellular❌❌
PlatformiOS & AndroidiOS & Android
TierSports GPSSports GPS
Buy timing
ReleasedApr 11, 2024May 15, 2025
Cycle advicebadgood★
Deals advicegood★neutral
Next model——

Health Sensors

Polar Grit X only
1 exclusive sensor
Running PowerWrist-based watt output — tracks effort independent of terrain
Both
3 shared
Heart RateContinuous or on-demand pulse tracking
SpO2Blood oxygen saturation, tracked during sleep
HRVHeart rate variability — stress & recovery scores
Garmin Forerunner 570 only
4 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
Skin TempOvernight changes linked to illness or cycle tracking

Why buy each?

Polar Grit X

40-day battery for trail and ultra runners

Five times the battery of the Vantage V3 — enough for week-long mountain stages or ultramarathons without charging access.

Hill splitter auto-detection

Automatically segments your run by uphill and downhill sections, calculating pace and power for each — essential for mountain race training.

Wrist running power at mid-range price

Running power without a chest strap or foot pod — Polar's key differentiator versus Garmin at this price tier.

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.

Quick Winner

The right pick depends on what you optimize for.

For the budget
Polar Grit X wins

$749 vs $759 over 3 years · no required subscription.

For battery life
Polar Grit X wins

40 days vs 11 days battery.

For health depth
Garmin Forerunner 570 wins

7 sensors.

For daily comfort
Garmin Forerunner 570 wins

42g · no required subscription.

Bottom Line

Technical gaps
  1. Grit X-only sensors: Running Power.
  2. Forerunner 570-only sensors: Stress Tracking, Body Battery, Training Readiness, Skin Temp.
  3. Weight. Forerunner 570 is 15g lighter — relevant for all-day comfort and sleep.
  4. Water resistance. Grit X rates 100m vs 5ATM on Forerunner 570.
Commercial gaps
  1. Hardware cost. Forerunner 570 is $200 cheaper upfront ($549 vs $749).
Pick the Polar Grit X if…

Trail runners, hikers, and outdoor athletes who want Polar's analytics with significantly longer battery life than the Vantage V3. The titanium case and sapphire glass make it suitable for technical terrain where watch durability matters.

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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.

Full details →
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