Jump to: What’s new vs PW3 | Specifications | Battery | Features | Activities | Further reading
Expert opinion
The Pixel Watch 4 is the first Pixel Watch that does not ask you to forgive anything. Bright enough to read in direct sun, two days of battery rather than one, and fifteen minutes on the charger covers most of a day. That removes the daily friction that made earlier Pixel Watches tiring to own.
Sport tracking is competent. GPS is accurate enough for anyone not comparing traces against a chest strap. Heart rate holds up outside high-intensity intervals. Gemini answers most questions well, needs a connection to do so, and still bounces you into the app for anything about your own training.
You can replace the battery and screen yourself, which nothing else at this price allows. The deeper training insights need a subscription. The domed glass sits proud of the case and will collect scratches.
For an Android phone owner who trains recreationally, this is the one. Anyone racing, using power meters, or needing more than two days between charges should buy a sports watch.
What’s new versus Pixel Watch 3
- Dual-frequency GNSS (GPS, Galileo, GLONASS)
- Snapdragon W5 Gen 2 processor, 25% faster and 50% less power than the W5 Gen 1
- 3,000 nit peak brightness, up from 2,000 nits
- 10% larger display and 16% smaller bezel
- 45mm battery increased to 455mAh, battery life up 25%
- Fast charging: 0-50% in 15 minutes
- Satellite SOS on LTE models, the first standalone implementation on a smartwatch
- User-replaceable battery and display
- More accurate skin temperature sensor
- Cortex-M55 co-processor added
- 15% stronger haptics, improved speaker volume, water ejection
- AI workout detection
- Wear OS 6.0 with Material 3 UI and Gemini integration
- 18% more accurate sleep stage detection
- New sport profiles: American Football, Badminton, Baseball, Basketball, Cricket, Field Hockey, Soccer, Outdoor Swimming, Padel, Pickleball, Pool Swim, Rugby
Specifications
| Feature | 41mm | 45mm |
|---|---|---|
| Case diameter | 41mm | 45mm |
| Height | 12.3mm | 12.3mm |
| Weight (without band) | 31.0g | 36.7g |
| Case material | 100% recycled aluminium | 100% recycled aluminium |
| Display | Actua 360, 320ppi AMOLED LTPO, 3000 nits peak, 1 nit AOD, 1-60Hz, Gorilla Glass 5 | Identical |
| Processor | Qualcomm Snapdragon W5 Gen 2 + Cortex-M55 co-processor | Identical |
| Storage and memory | 32GB eMMC, 2GB SDRAM | 32GB eMMC, 2GB SDRAM |
| OS | Wear OS 6.0 (updated to 6.1) | Wear OS 6.0 (updated to 6.1) |
| GPS | Dual-frequency: GPS, Galileo, GLONASS | Identical |
| GPS score (the5krunner) | 83% | 83% |
| Connectivity | Bluetooth 6.0, Wi-Fi 6 (2.4/5GHz), NFC, UWB, 4G LTE (LTE models), Satellite SOS (LTE models only) | Identical |
| Sensors | Optical HR (multi-path), ECG, SpO2, cEDA (skin conductance), skin temperature, barometer, altimeter, compass, magnetometer, gyroscope, accelerometer, ambient light | Identical |
| Interaction | Side button, haptic crown, Gen 3 Premium haptics. Double-pinch and wrist-turn gestures added in Wear OS 6.1 | Identical |
| Water resistance | 5ATM, IP68 | 5ATM, IP68 |
| Band (included) | Active Band, fluoroelastomer, S+L sizes | Active Band, fluoroelastomer, S+L sizes |
| Band fit | Small 130-175mm, large 165-210mm | Small 150-185mm, large 165-215mm |
| Android compatibility | Android 11.0 or newer (not Android Go) | Identical |
| Warranty | One year | One year |
| Accessibility | TalkBack screen reader, Magnifier, real-time text | Identical |
| Security updates | 3 years from US launch | 3 years from US launch |
| Repairability | User-replaceable battery and display | Identical |
| In box | Watch, Active Band (S+L), Quick Charge Dock | Identical |
| Announced | 20 August 2025 | 20 August 2025 |
| On sale | 9 October 2025 | 9 October 2025 |
| Successor | Pixel Watch 5 (August 2026) | Pixel Watch 5 (August 2026) |
| UK price at launch (Wi-Fi / LTE) | £349 / £449 | £399 / £499 |
| UK price current (Wi-Fi) | £249 | £249 |
| US price at launch (Wi-Fi / LTE) | $349 / $449 | $399 / $499 |
Battery life
| Mode | 41mm | 45mm |
|---|---|---|
| Always-on display | Up to 30 hours | Up to 40 hours |
| Battery Saver | Up to 48 hours | Up to 72 hours |
| Capacity | 325mAh | 455mAh |
| Charge to 50% | ~15 minutes | ~15 minutes |
| Charge to 80% | ~25 minutes | ~30 minutes |
| Charge to 100% | ~45 minutes | ~60 minutes |
| Tested (45mm, AOD) | – | Slightly exceeded 40 hours |
Key features
GPS accuracy
Dual-frequency GNSS across GPS, Galileo and GLONASS. The Pixel Watch 4 scored 83% on the standard the5krunner GPS test course, placing it in the accurate-but-not-leading tier alongside Suunto and Amazfit dual-frequency devices. The current Garmin Synaptics and Apple Ultra implementations are marginally better. Cadence lock appeared in one treadmill session during testing. No cloud-based post-processing, which arrived with the Pixel Watch 5.
Optical heart rate
Multi-path optical sensor, broadly accurate in steady-state efforts. Cadence lock recorded in one test session. The Apple Watch Ultra 3 produced dropouts where the Pixel Watch recorded continuously, and neither platform was consistently superior across all test conditions. Deep sleep detection was the most accurate of three devices tested against the Apple Watch Ultra 3 and Eight Sleep Pod.
Gemini
Accessed via the side button. Handles conversational commands, smart home control, scheduling and factual queries. At the time of review, sports performance questions opened the Fitbit app rather than answering directly. Gemini coaching arrived later via Google Health Premium.
Wear OS 6.1 update
Added the double-pinch gesture, exclusive to the Pixel Watch 4 at launch: pinch index finger and thumb twice to scroll notifications, manage timers, snooze alarms and control media. A wrist-turn gesture dismisses calls and notifications. Smart replies run twice as fast on-device. Delivered in the March 2026 Pixel Drop.
Satellite SOS
Off-grid emergency communication via satellite, available on LTE models only. Included free for 2 years from launch. Extended to Canada, Europe, Alaska and Hawaii in the March 2026 update.
Activities
Around 40 tracked activities via the Google Health app, formerly Fitbit. GPS-tracked activities include running, outdoor cycling, hiking and walking. Pool and open water swimming are tracked without GPS. Other profiles include HIIT, strength training, yoga, Pilates, elliptical, rowing, basketball, pickleball, badminton, baseball, American football, field hockey, soccer, cricket, rugby, padel and general sport. Multi-sport mode for triathlon is not supported.
Further reading
- Full Pixel Watch 4 review: 9 cons and 5 pros, GPS and heart rate accuracy data, sleep comparison, Gemini against Siri
- Pixel Watch 5 specifications: the successor
- March 2026 Wear OS 6.1 update
- Every Pixel Watch 4 watchface
- Google Fitbit and Wear OS hub
- Official spec sheet: Google Store UK
- Setup guide: Google Pixel Watch Help
Explore the full resource library
This site covers endurance sport technology across a range of dedicated reference sections. Each one collects the most relevant articles, tests, and analysis on its topic in one place.
Buyer guides
- Best sports watch — tested recommendations by sport and athlete type: triathlon, running, marathon, cycling, hiking, and women
- Best Garmin watch — Forerunner versus Fenix by series, sport, and budget
- Best wearables — recovery trackers, heart rate monitors, running power meters, and female athlete tech
- Best cycling products — computers, smart trainers, power meters, and cycling heart rate monitors
Brand and product guides
- Amazfit — the full Amazfit range from Balance to Cheetah to T-Rex, accuracy tests, HYROX partnership, and Zepp Health analysis
- Apple Watch for Sport — athlete-first coverage of Apple Watch across running, cycling, and triathlon
- COROS — watches, features, and firmware across the full COROS range
- Garmin — the company, the platform and the full range, and the starting point for choosing across every Garmin product line
- Garmin Edge — bike computers from entry-level navigation to flagship endurance and mountain biking
- Garmin Fenix — every model, feature, and firmware development for Garmin's flagship outdoor watch
- Garmin Fenix 8 Series — which variant to buy, upgrade advice, accuracy data, and the full Fenix 8 review and firmware coverage
- Garmin Forerunner — the full Forerunner line covered from entry level to triathlon flagship
- Garmin Instinct — rugged GPS watches for endurance and adventure athletes
- Garmin Features Explained — how Garmin's metrics work, from Training Load and Body Battery to Race Predictor and HRV Status
- Google Fitbit — Fitbit Air, Google Health, Pixel Watch and the Wear OS platform
- Polar — watches, sensors, Polar Flow and training science across the full Polar range
- Suunto — Race, Vertical, Run and the SuuntoPlus ecosystem
- Strava — features, privacy, segments, and how Strava fits into a serious training setup
- Wahoo — KICKR trainers, ELEMNT bike computers, and the Wahoo ecosystem
- WHOOP — strain, recovery, sleep and the full WHOOP ecosystem
Specifications database
- Full Specifications Database — detailed spec sheets, battery life, sensor lists and generation-on-generation comparisons for current Garmin, COROS, Amazfit, Samsung, Google Fitbit, Huawei, Suunto, Wahoo and Apple Watch models
Sport and topic guides
- Running Watches — how to choose by discipline: road racing, trail, track, beginner, and multisport
- Triathlon and Multisport Technology — watches, sensors, and race-day tools for swimmers, cyclists, and runners
- HYROX — training science, race analysis, and technology for the functional fitness race format
- parkrun — technology, training, and performance for the weekly 5K
- Hiking Technology — navigation, safety, and trail tech for walkers and hikers
- Heart Rate Monitoring — optical sensors, chest straps, accuracy comparisons, and how to set training zones
- GPS Accuracy — how satellite systems perform across brands, terrains, and conditions
- Recovery Trackers — WHOOP, Oura, and the science of readiness scoring
- Female Athlete Tech — wearables, physiology, and performance for female endurance athletes, covering cycle-synced training, RED-S, HR accuracy, and VO2max
- Sports Science — peer-reviewed research on HRV, VO2max, lactate threshold, running power, wearable accuracy, and supplementation
- Testing Methodology — how this site tests GPS accuracy, heart rate, battery life, and other performance claims
Content series
- Release Radar — confirmed launches, leaks, and rumours across Garmin, Apple, COROS, Polar, Suunto, and Wahoo
- Deep Dive Feature Files — weekly firmware feature updates across all brands (bug fixes excluded)
- Fix Files — weekly firmware bug fix tracking across all brands
