Wear Radar

Fitbit EdgevsPolar Grit X

40d vs 7d
battery life
Polar Grit X lasts longer
$820
price gap
Fitbit Edge cheaper
0.5 Hz
HR sampling
Fitbit Edge only — Polar Grit X undisclosed
39g
lighter
Fitbit Edge
Fitbit Edge
Buy/Wait:good

Current model just released

Full details →
Polar Grit X
Buy/Wait:bad

Overdue for a refresh — no successor announced yet. Prices should be at their lowest

Full details →
Fitbit EdgePolar Grit X
Pricing
Starting price$179★$999
Subscriptionℹ️ Optional — $99/yr✓ None
Hardware
Weight18g★57g
Water resistance50m100m★
Battery7 days40 days★
Always-on display✅★❌
GPS✅✅
Cellular❌❌
PlatformiOS & AndroidiOS & Android
TierFitness TrackerSports GPS
Buy timing
ReleasedOct 27, 2026Apr 11, 2024
Cycle advicegood★bad
Deals adviceneutralgreat★
Next model——

Health Sensors

Fitbit Edge only
2 exclusive sensors
ECGDetects irregular heart rhythms (AFib)
Skin TempOvernight changes linked to illness or cycle tracking
Both
3 shared
SpO2Blood oxygen saturation, tracked during sleep
Heart RateContinuous or on-demand pulse tracking
HRVHeart rate variability — stress & recovery scores
Polar Grit X only
1 exclusive sensor
Running PowerWrist-based watt output — tracks effort independent of terrain

Why buy each?

Fitbit Edge

Larger AMOLED display with always-on option

A 1.34" AMOLED screen, 46% larger than the Charge 6's, with an optional always-on mode and a physical button.

Built-in GPS, ECG, and an altimeter

Multi-system GPS for phone-free runs, an ECG app for AFib checks, SpO2 and skin temperature sensing, and an altimeter for elevation.

User-replaceable battery

Up to 7 days per charge, a 5-minute top-up for about a day of use, and a battery you can replace yourself when it wears out.

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-based running power

Running power without a chest strap or foot pod, built into the watch.

Quick Winner

The right pick depends on what you optimize for.

For the budget
Fitbit Edge wins

$476 vs $999 over 3 years.

For battery life
Polar Grit X wins

40 days vs 7 days battery.

For health depth
Fitbit Edge wins

5 sensors · 0.5 Hz HR sampling.

For daily comfort
Fitbit Edge wins

18g.

Bottom Line

Technical gaps
  1. Edge-only sensors: ECG, Skin Temp.
  2. Grit X-only sensors: Running Power.
  3. Weight. Edge is 39g lighter — relevant for all-day comfort and sleep.
  4. Water resistance. Grit X rates 100m vs 50m on Edge.
Commercial gaps
  1. Hardware cost. Edge is $820 cheaper upfront ($179 vs $999).
Pick the Fitbit Edge if…

Anyone who wants a slim tracker with a screen, built-in GPS, and ECG rather than a full smartwatch. It suits Charge owners ready to upgrade, as long as they don't rely on Google Wallet payments or EDA stress scans. Works with both Android and iPhone via the Google Health app.

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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.

Full details →