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SimplyAmplifying

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What the experts found, in one honest verdict

Apple Watch Ultra 4 review roundup: what the experts found

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by

Wearables Desk (AI)

in

SimplyAmplifying score: 8.4/10 · Confidence: High · Based on 7 in-depth review(s) from 5 outlets, and 16 article(s) read in full

First published 2 October 2026 · Last updated 4 October 2026 · Updated 5 times as new reviews came in

Reviewers’ own scores: Tom’s Guide 4.5/5

The verdict

Across 7 reviews from 5 outlets, the verdict is positive and we have high confidence in it. Reviewers like the longer battery life, bright display and upgraded heart rate sensing, and Tom’s Guide gave it 4.5/5. The main reservations are its size and weight, a price well above the Series 12, and headline software features that were not ready at launch.

Best for: Buyers who want a rugged, long-lasting Apple smartwatch with strong fitness tracking and plan to wear it for several years.
Skip it if: You want a lighter, slimmer watch or the lowest price, since reviewers call it heavy and costly next to the Series 12.

Scores by category

CategoryScoreConfidenceOutlets
Health & fitness accuracy9.1/10High7
Battery life8.5/10Medium6
Software & apps7.7/10Medium8
Display8.9/10High6
Comfort & design7.5/10High7
Value7.3/10High6

What reviewers liked

  • Battery lasted about two days in real-world testing, with fast charging
  • Upgraded heart rate sensor with far more frequent background readings
  • Bright 3,000-nit display that stays clear in sunlight
  • Readiness score and Sound Recognition were welcomed by several outlets
  • Price unchanged from Ultra 3, with a stronger chip and more memory

What they didn’t

  • Heavy and thick, and it wears large on smaller wrists
  • Live Rewind and Siri Recap were not available at launch
  • Touchscreen was hard to use with cold, wet gloves in DC Rainmaker’s testing
  • Costs nearly double the Series 12 and more than Samsung’s rival

In detail

Health & fitness accuracy: 9.1/10

Tom’s Guide tested heart rate against a chest strap and an Oura Ring 5 over a 22-mile run and found the readings matched. It also noted the improved sensor design and step accuracy. DC Rainmaker described a new sensor with more electrode surface area, background heart rate readings every 5 seconds and HRV readings every 5 minutes. It measured sleep and wake times within 1-2 minutes of actual times and found the Readiness score reasonably accurate, similar to Garmin’s. It called Apple’s claim of beating competitors by 1bpm hard to verify. 9to5Mac saw no improvement in automatic workout detection.

Battery life: 8.5/10

Outlets agree on the rated figures: 50 hours of normal use, 84 hours in Low Power mode, 45 hours in Max Extended GPS mode, and 18 hours of charge from 15 minutes. DC Rainmaker measured about 2.5 days with heavy workouts, against 1-1.5 days for the Series 12, and 18 hours of GPS versus 10. Tom’s Guide’s testing supported the 50-hour figure. TechRadar saw just over a day, approaching two. Trusted Reviews said roughly two days falls short of many top smartwatches. MacRumors mostly repeated rated figures, including 50 hours against the Ultra 2’s 36.

Software & apps: 7.7/10

Opinion is more mixed here. DC Rainmaker, 9to5Mac, Trusted Reviews and MacRumors liked the Readiness score, and DC Rainmaker and MacRumors also praised Sound Recognition. Several outlets noted that Live Rewind and Siri Recap were missing at launch, with DC Rainmaker saying they were planned for later in 2026, and 9to5Mac and Trusted Reviews questioned how useful they will be. Smartprix Bytes found Siri responses slightly sluggish, while MacRumors measured faster Siri queries than on the Ultra 3. ZDNET reported random restarts when changing settings, fixed by watchOS 27.0.1.

Display: 8.9/10

Reviewers agree on 3,000 nits peak brightness. DC Rainmaker measured it on the 1.98-inch screen, found it clearly visible in bright sun, and noted it dims to 1 nit at night. It also found it brighter than the Series 12’s 2,000 nits. Tom’s Guide said the display is unchanged from the Ultra 3 and trails Samsung Galaxy Watch Ultra 2’s 5,000 nits. 9to5Mac measured a display area 2% smaller than the Series 10 and 11, with a 1mm wider case, but found it imperceptible in use. Smartprix Bytes called it a noticeable upgrade on older standard models.

Comfort & design: 7.5/10

Outlets mostly treat the design as unchanged, rugged and large. DC Rainmaker lists a 63-gram case, 12mm thick, against the Series 12’s 32-52 grams and 9.7mm. It liked the button guard against accidental presses but found the touchscreen problematic in cold, wet conditions with gloves. Tom’s Guide noted the same 49 x 44mm size as the predecessor and said it wears large on an average 6.5-inch wrist. 9to5Mac was the most positive. Trusted Reviews noted a 10ATM water rating, allowing submersion to 100m. Several outlets only listed specifications.

Value: 7.3/10

The price is $799 in the reviews we read, which MacRumors says is the same as the Ultra 3. Verdicts split. Trusted Reviews and DC Rainmaker stressed that it costs nearly double the Series 12’s $399, and Trusted Reviews noted it is $100 above Samsung’s Galaxy Watch Ultra 2 at $699. MacRumors called it a better default for new buyers who will wear it for several years if the price gap is modest. 9to5Mac called it the most substantial upgrade in years and urged Series 9 and Ultra 2 owners to consider it. Tom’s Guide welcomed the unchanged price.

Sources

How we put this together

We read the reviews and articles listed above and weigh each by how much it should count: in-depth, hands-on testing with measurements counts most; launch news and press-release rewrites count least; sponsored content is penalised. Category scores are our trust-weighted summary of what those sources found, set to the same 10-point scale reviewers use; the reviewers’ own scores, where published, are listed above. This page was compiled with AI assistance and checked against the source notes. All findings belong to the outlets credited above; follow the links to read their full reviews. How we score.

Header image: AI illustration by SimplyAmplifying, drawn from several reference photos of the product; scores drawn from this page’s data.

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