Fitbit ChargevsApple Watch Ultra

7d vs 1.75d

battery life

Fitbit Charge lasts longer

$679

price gap

Fitbit Charge cheaper

47g

lighter

Fitbit Charge

more health sensors

Apple Watch Ultra

Fitbit Charge

Buy/Wait:bad

Late in cycle — a new model is likely coming

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Apple Watch Ultra

Buy/Wait:neutral

Reaching maturity, next model expected soon

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	Fitbit Charge	Apple Watch Ultra
Pricing
Starting price	$120★	$799
Subscription	ℹ️ Optional — $79/yr	✓ None
Hardware
Weight	15g★	62g
Water resistance	50m	100m★
Battery	7 days★	1.75 days
Always-on display	❌	✅★
GPS	✅	✅
Cellular	❌	✅★
Platform	iOS & Android	iOS only
Tier	Fitness Tracker	Sports GPS
Buy timing
Released	Sep 28, 2023	Sep 19, 2025
Cycle advice	bad	neutral★
Deals advice	great★	neutral
Next model	Fitbit Charge 7 (Expected 2026)	Apple Watch Ultra 4 (Expected fall 2026)

Health Sensors

Fitbit Charge only

1 exclusive sensor

EDA / StressSkin conductance sensor measuring stress responses

Both

5 shared

ECGDetects irregular heart rhythms (AFib)

SpO2Blood oxygen saturation, tracked during sleep

Heart RateContinuous or on-demand pulse tracking

HRVHeart rate variability — stress & recovery scores

Skin TempOvernight changes linked to illness or cycle tracking

Apple Watch Ultra only

7 exclusive sensors

Irregular RhythmBackground optical check for irregular heart rhythms

Fall DetectionAuto-calls emergency services after a hard fall

Crash DetectionDetects vehicle crashes and alerts emergency contacts

Sleep ApneaFDA-cleared detection of signs of moderate to severe sleep apnea

Blood PressureDetects hypertension patterns — trend tracking, not clinical mmHg

Depth GaugeMeasures water depth — certified for recreational diving to 40m

Water TempMeasures water temperature during swimming and diving

Why buy each?

Fitbit Charge

ECG and EDA stress in a slim band

Full ECG, electrodermal activity stress sensing, SpO2, and continuous heart rate in a tracker thinner than most smartwatches.

Google apps integration

Google Maps navigation, Google Wallet NFC payments, and YouTube Music controls — more useful on-device apps than any previous Charge.

7-day battery with GPS

7 days of typical use, dropping to around 30 minutes per GPS workout session before needing a charge.

Apple Watch Ultra

42-hour battery + satellite SOS

The Ultra 3 nearly doubles the Series 11 battery life, and satellite emergency SOS works even without cellular or WiFi coverage.

Dual-frequency L1+L5 GPS

More precise GPS tracking in urban canyons and dense forests — critical for trail running, mountaineering, and triathlon.

3000-nit titanium-cased powerhouse

The 49mm titanium case and 3000-nit display make this watch usable in full direct sunlight and water depths up to 100m (EN13319 certified for diving).

Quick Winner

The right pick depends on what you optimize for.

Bottom Line

Technical gaps

Charge-only sensors: EDA / Stress.
Watch Ultra-only sensors: Irregular Rhythm, Fall Detection, Crash Detection, Sleep Apnea, Blood Pressure, Depth Gauge, Water Temp.
Weight. Charge is 47g lighter — relevant for all-day comfort and sleep.
Water resistance. Watch Ultra rates 100m vs 50m on Charge.

Commercial gaps

Hardware cost. Charge is $679 cheaper upfront ($120 vs $799).

Pick the Fitbit Charge if…

Anyone who wants serious health and fitness tracking without the bulk or cost of a full smartwatch. Works with both Android and iPhone, making it the most accessible Fitbit tracker in the lineup.

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Pick the Apple Watch Ultra if…

Serious athletes, trail runners, triathletes, and outdoor adventurers who need the most durable, most accurate GPS watch Apple makes. Also for iPhone users who simply want the best Apple Watch regardless of sport, and value the extra battery life over the Series 11.

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