Wear Radar

Fitbit VersavsPolar Grit X

40d vs 6d
battery life
Polar Grit X lasts longer
$849
price gap
Fitbit Versa cheaper
19g
lighter
Fitbit Versa
Fitbit Versa
Buy/Wait:bad

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

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 VersaPolar Grit X
Pricing
Starting price$150★$999
Subscriptionℹ️ Optional — $79/yr✓ None
Hardware
Weight38g★57g
Water resistance50m100m★
Battery6 days40 days★
Always-on display❌❌
GPS✅✅
Cellular❌❌
PlatformiOS & AndroidiOS & Android
TierSmartwatchSports GPS
Buy timing
ReleasedSep 25, 2022Apr 11, 2024
Cycle advicebadbad
Deals advicegoodgreat★
Next model——

Health Sensors

Fitbit Versa only
1 exclusive sensor
EDA / StressSkin conductance sensor measuring stress responses
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 Versa

Works with Android and iPhone

Rare for a smartwatch with real GPS and health sensors to work fully on both platforms — Versa 4 does.

Google Maps and Google Wallet on wrist

Turn-by-turn navigation and NFC payments without needing your phone in hand.

6-day battery and Fitbit health coaching

Sleep stages, daily readiness score, Active Zone Minutes, and SpO2 — all on a 6-day charge.

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 Versa wins

$387 vs $999 over 3 years.

For battery life
Polar Grit X wins

40 days vs 6 days battery.

For health depth
Tie

4 sensors each.

For daily comfort
Fitbit Versa wins

38g.

Bottom Line

Technical gaps
  1. Versa-only sensors: EDA / Stress.
  2. Grit X-only sensors: Running Power.
  3. Weight. Versa is 19g lighter — relevant for all-day comfort and sleep.
  4. Water resistance. Grit X rates 100m vs 50m on Versa.
Commercial gaps
  1. Hardware cost. Versa is $849 cheaper upfront ($150 vs $999).
Pick the Fitbit Versa if…

Android or iPhone users who want a balanced smartwatch with solid Fitbit health tracking, multi-day battery, and a clean square watch design — without the premium price of a Galaxy Watch or Apple Watch.

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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 →