Compare Xiaomi Redmi Watch 4 vs Apple Watch Ultra 2

Workout auto-detection appears in several reviews and covers common modes, so it is a useful convenience rather than a standout training feature.

Automatic activity support appears around brisk-walk logging, running-track recognition, and contextual auto-marking, though reviewers do not dwell on broad workout auto-detection.

The watch handles built-in basics, but reviewers repeatedly note that there is no real app store or downloadable app ecosystem.

The app ecosystem is one of the clearest strengths, with reviewers praising Apple’s native and third-party app depth over competing watch platforms.

Strap feedback is split: quick-release hardware is welcomed, but several reviewers criticize the clasp, feel, or friction of the stock band.

Band impressions are mostly positive, especially for comfort and material quality, though one reviewer found the Alpine Loop slow to dry after sweat or water.

Battery life is one of the clearest strengths, with reviewers commonly getting a week or more and quoting up to two or three weeks depending on settings.

Battery life is excellent for an Apple Watch, often lasting two to three days, but dedicated GPS watches still make it look short for endurance use.

Blood oxygen tracking is present and can run continuously, but reviewers disagree on whether the readings are dependable enough for deeper health insight.

Blood oxygen coverage is mixed in the review set because some reviews mention the feature’s patent-related absence, while the updated PCMag review says monitoring was restored.

Bluetooth is adequate for pairing and calls, with reviewers treating it as a basic but functional connection layer.

Bluetooth support is strong for cycling accessories, especially power meters, speed sensors, and cadence sensors, with reviewers treating it as a useful sports upgrade.

Brightness is consistently praised, with the 600-nit AMOLED panel considered strong for the price and usable in bright conditions.

Brightness is a major consensus strength, with repeated praise for the 3,000-nit display and flashlight improvement.

Build quality is a major upgrade over prior Redmi watches thanks to the aluminum/metal frame and generally sturdy feel.

Reviewers consistently describe the build as premium, rugged, and performance-oriented, with titanium, sapphire, and protected controls adding confidence.

The rotating crown is useful for navigation, though some reviewers dislike its lack of tactility or note accidental presses.

Button controls are a practical Ultra advantage, especially the Action Button and gloved-use crown, though one long-term reviewer admits the Action Button never became a habit.

Bluetooth calling is consistently treated as a useful smartwatch feature, with positive comments about making, receiving, or hearing calls from the wrist.

Call handling gets direct praise for clear and sufficiently loud audio, helped by the Ultra line’s microphone and speaker hardware.

Calorie tracking is only supported as a rough estimate, not a reliable training metric.

Calorie tracking is framed through Apple’s activity rings and standard fitness metrics rather than as a lab-tested calorie measurement system.

Charging convenience is limited because reviewers identify the cable as proprietary, making it less travel-friendly than universal charging.

Charging is convenient through familiar magnetic charging and occasional iPhone-powered charging, though reviewers still need to charge more often than with sports watches.

Charging speed is not a strength; one review specifically notes there is no fast charging and a full charge takes well over an hour.

Charging speed is acceptable, commonly around 0-80% in about an hour and full in roughly 90 minutes, but slower than the faster-charging Series 10.

Coaching features are better than expected for the price, with running workouts, warm-ups, and training details, but they remain basic.

Coaching improved with Training Load and effort context, but several reviewers still find Apple’s coaching and analysis shallower than Garmin, Whoop, or similar platforms.

The large watch is still light enough for all-day wear and sleep tracking, though its size can affect smaller wrists.

Comfort is context-dependent: some reviewers find the Ultra 2 comfortable all day, while others note size, tugging, or crown irritation on smaller wrists.

Mi Fitness is functional and covers settings and stats, but reviewers describe it as plain, dated, or merely adequate rather than polished.

Companion app quality is strong, with reviewers praising Apple Watch, Health, and Fitness app integration and easy configuration from the iPhone.

Contactless payment support is a repeated limitation outside China, with several reviewers saying payment/NFC functionality is missing or region-bound.

Contactless payments are a reliable smartwatch strength, with Apple Pay repeatedly cited as part of the platform’s everyday convenience.

The watch is broadly compatible with Android and iOS, and reviewers reported using or setting it up across both platforms.

Cross-platform compatibility is poor because the Ultra 2 requires an iPhone and does not work with Android phones.

Customization is decent for watch faces, widgets, shortcuts, straps, and personal photos, though some reviewers want deeper software customization.

Customization is strong across watch faces, complications, utility slots, action button choices, and app-driven personalization.

The large AMOLED display is one of the strongest features, though one reviewer found colors slightly washed out and bezels can be noticeable.

Display quality is one of the best-reviewed attributes, with multiple reviewers calling it among the best smartwatch screens they have tested.

Durability looks good from the aluminum body and water resistance, but sharp-edge scratch concerns appear in one review.

Durability is a major strength, supported by titanium, sapphire, MIL-STD testing, and reviewers’ reports of wear resistance.

ECG functionality is well supported and repeatedly mentioned as part of the Ultra 2’s robust health suite, including Afib-related features.

Fit is context-dependent because the large case helps readability but may feel oversized on smaller wrists.

Fit is mixed: the rectangular case can feel secure, but the single 49mm size can be challenging for smaller wrists.

Fitness accuracy is mixed: some reviewers praise it for casual use, while others find it too rough for serious training.

Fitness tracking accuracy is excellent overall, with reviewers praising GPS, heart-rate, and overall workout tracking accuracy against reference devices.

GPS feedback ranges from stellar to merely okay, with multiple reviewers saying competitors or phones can track more accurately.

GPS accuracy is consistently strong, with dual-frequency/multiband tracking matching or approaching Garmin-class performance in several tests.

Overall health accuracy is mixed to weak because richer health metrics are undermined by questionable heart-rate and blood-oxygen data.

Health tracking accuracy is viewed positively for sleep apnea, ECG-adjacent accuracy, and broad health tracking, though some insights still need manual interpretation.

Heart-rate accuracy is the most disputed health metric, with several reviewers reporting poor or iffy readings and one positive reviewer seeing good reference data.

Heart-rate accuracy is one of the strongest measured areas, with reviewers reporting close agreement with chest straps and armband monitors.

LTE or cellular independence is absent, so connected features like SOS and assistant use still depend on a nearby phone.

LTE is a core feature because cellular support comes standard, enabling calls, streaming, and messaging away from the iPhone when a plan is active.

Mapping and navigation are useful but frequently caveated: Compass, waypoints, routes, and maps help, yet native GPX and phone-free offline mapping gaps remain.

Materials quality is widely praised for the aluminum or metal frame, which makes the watch feel less budget than older plastic models.

Materials quality is high, with recycled titanium, sapphire protection, and premium band hardware recurring across reviews.

Menu navigation is generally easy thanks to swipes, widgets, and the crown, with the large screen helping readability.

Menu navigation is helped by the crown, complications, Modular Ultra, and Smart Stack, which reviewers generally find useful for quick glanceable information.

Music controls are useful for phone playback, but reviewers do not describe true onboard music playback as a strength.

Music controls work well through Double Tap and the Music app, with speaker playback and wrist controls adding everyday convenience.

Onboard music storage is effectively absent in the reviewed evidence; one review lists a music player among missing features.

Onboard storage is improved to 64GB, giving reviewers more confidence for offline music, podcasts, apps, and media downloads.

HyperOS is smooth but basic, and one Chinese-version review disputes whether it behaves like a real HyperOS smartwatch.

The operating system experience is polished, especially with watchOS 10 and 11 updates adding new watch faces, cycling features, Smart Stack, and Ultra features.

Outdoor visibility is strong, with repeated praise for the bright screen being readable outside or in sunlight.

Outdoor visibility is excellent, with several reviewers reporting no trouble reading the screen in sunlight or bright reflective conditions.

Pairing and syncing appear generally reliable in the main written review, though this is not heavily discussed across sources.

Pairing evidence is limited but positive, with one setup transcript saying the familiar Apple pairing flow completed cleanly.

Recovery insights exist, but reviewers question their usefulness because they rely on imperfect exercise and heart-rate data.

Recovery insights are a recurring weakness; reviewers repeatedly say Apple lacks Garmin/Whoop-style recovery, readiness, and performance analysis.

Reliability is mixed: one reviewer reports a recurring DND sync bug, while another praises good connection.

Reliability is broadly positive in long-term and battery-use impressions, with reviewers describing stable every-other-day charging and dependable use.

Safety features center on emergency SOS through the crown, but reviewers note the phone must be nearby.

Safety features are a standout Ultra trait, including siren, SOS, fall and crash detection, Backtrack, cellular waypoints, and emergency guidance.

Size options are a clear limitation because the Ultra 2 comes only in a large 49mm case.

Sleep tracking is often good for bedtime and duration, but more advanced sleep or heart-rate details are less trustworthy.

Sleep tracking is generally accurate but simpler than rival platforms; newer sleep apnea detection adds more health value.

Notifications are useful and readable on the large screen, but reply support, emoji display, or notification limits are recurring caveats.

Smartphone notifications are handled well, with reviewers praising rich notifications, texting, and responsive notification handling within the Apple ecosystem.

Smartwatch features cover basics like calls, notifications, weather, calendars, and controls, but reviewers repeatedly frame them as basic.

Smartwatch features are outstanding overall, with reviewers treating the Ultra 2 as Apple’s most full-featured wearable and a top true smartwatch.

Software smoothness is a standout; reviewers repeatedly call the interface smooth, snappy, fluid, or minimally laggy.

Software smoothness is strong, with reviewers describing zippy, quick, responsive, and buttery-smooth operation.

Step tracking is good enough for casual use, with reviewers finding it generally in line or not wildly off.

Stress tracking is included and can run with other wellness metrics, though reviews provide limited proof of its accuracy.

Reviewers generally like the design, especially the big square look and more premium metal frame at a budget price.

Style and design are praised for the premium rugged look, especially the black titanium version, though the large look is not for everyone.

Third-party support is mixed: there is no watch app store, but Mi Fitness can sync with services like Strava and Apple Health.

Third-party app support is excellent through the watchOS App Store and helps fill gaps in navigation, fitness, and everyday smartwatch use.

Touch and interaction responsiveness are positive where discussed, with reviewers calling the display responsive and the interface snappy.

Touchscreen responsiveness is excellent on land, with reviewers praising taps and swipes, though touch does not work underwater.

The UI is generally clear, colorful, and optimized for the large square screen.

The user interface is generally easy and polished, especially for iPhone users, Smart Stack, and redesigned watchOS apps.

Value is strong for shoppers prioritizing battery, display, and design, but several reviewers say rival budget watches can offer smarter features or better tracking.

Value is mixed: the Ultra 2 can justify its price for users who exploit its rugged, cellular, and battery advantages, but reviewers repeatedly note cheaper or more specialized alternatives.

Voice assistant support is inconsistent: Alexa or Mi AI appears in some versions, while other reviewers note no assistant or China-only limitations.

Voice assistant quality improved with on-device Siri, faster commands, better dictation, and less cloud dependence, though a few minor voice quirks remain.

Watch faces are polarizing, ranging from limited and boring to a large free selection depending on version, region, and reviewer expectations.

Watch face quality is strong, especially Modular Ultra and complication-rich layouts designed for the large screen.

Water resistance is consistently strong for the category, with 5ATM/50m claims and real swim or shower use noted.

Water resistance is a major strength, with 100m/WR100 ratings, diving support, and better water credentials than standard Apple Watches.

Wellness insights are broad for the price, including sleep animals, Vitality, training load, and scores, but accuracy limits reduce trust.

Wellness insights are broad but uneven: Vitals, Health data, and trends help, but reviewers often want more interpretation and readiness-style guidance.

Wi-Fi is present as part of the core connectivity package, though reviews discuss it mostly as availability rather than as a tested performance differentiator.

Workout variety is excellent for the price, with reviewers repeatedly citing more than 150 sports or workout modes.

Workout tracking variety is strong across running, cycling, hiking, swimming, diving, strength training, structured workouts, and third-party sport apps.