Compare Xiaomi Redmi Watch 4 vs Samsung Galaxy Watch Ultra (2025)

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

Workout auto-detection is broadly useful, with reviewers citing automatic workout detection and reliable walk detection, though manual starts remain better for some activities.

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 a strength: reviewers mention many available apps, Google Play access, and expanded usefulness from the extra storage.

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

Band feedback is mostly positive for comfort, stability, and easy removal, though one reviewer noted dirt collecting in the strap holes.

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 one of the clearest strengths, often described as the best in Samsung’s lineup, though heavy GPS or always-on use can reduce it.

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 tracking is present across the health sensor set, but one long-term reviewer found SpO2 readings routinely low.

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

Bluetooth support is present, including Bluetooth 5.3 mentions, but external sensor connections were criticized or described as unavailable.

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

Brightness earns strong praise, with reviewers citing high nits, bright AMOLED output, and easy readability.

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

Build quality is consistently praised through the rugged titanium case, durable chassis, and robust construction.

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

Button controls are mixed: reviewers like the Quick/action button and programmable shortcuts, but one long-term reviewer disliked accidental presses and limited workout button behavior.

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

Call handling is supported through Bluetooth calling, speaker/mic use, and smartwatch features for calls and texts.

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

Calorie tracking is included as part of the activity metrics, but the evidence is limited to feature availability rather than deep accuracy testing.

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

Charging is wireless and reasonably convenient, but one reviewer criticized the missing wall charging block.

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 gets limited but positive evidence, with one review reporting a full charge in about 95 minutes.

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

Coaching features are a real addition, especially Running Coach, with reviewers describing personalized plans and guidance.

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

Comfort depends on wrist and expectations: some reviewers found it comfortable, while others felt the weight or bulk.

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

The companion app setup is useful but split, with health and smartwatch settings divided between Samsung Health and Galaxy Wearable.

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

Contactless payments are supported through Samsung Wallet or Samsung Pay shortcuts.

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

Cross-platform compatibility is limited: reviews say it works with Android but not iPhone, with the best experience tied to Samsung phones.

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

Customization is strong across programmable buttons, widgets, tiles, colors, and watch-face data.

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 a major strength, with repeated praise for the large, vibrant AMOLED display.

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

Durability is a standout, backed by titanium construction, MIL-STD claims, scratch protection, and reviewer reports of little damage.

ECG functionality is widely listed as part of the health feature set, though one review notes Samsung-phone pairing requirements for ECG and blood pressure.

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

Fit is polarizing: it can fit some larger wrists well, but reviewers also note the single 47mm size and large wrist footprint.

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

Fitness tracking accuracy is generally good for everyday and running use, though scientific testing places it below the top alternatives.

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

GPS accuracy is good in several reviewer tests and supports dual-frequency GPS, but scientific testing found some route deviation.

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

Health tracking is feature-rich but mixed in accuracy, with strong sensor coverage offset by questionable antioxidant, HRV, and some sleep-stage findings.

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 strongest in running evidence, with one reviewer matching a Polar strap closely, while scientific testing calls it good rather than elite.

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

LTE is a consistent advantage because it is standard or broadly available, though one reviewer notes carrier setup can cost extra.

Navigation support is useful through offline maps, Google Maps routing, and GPS widgets, but one reviewer notes no built-in maps on-watch.

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 strong, centered on titanium, sapphire/robust design references, and corrosion-resistant claims.

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

Menu navigation is mostly straightforward through swipes, app drawers, digital bezel haptics, and simple operation.

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

Music features are useful for downloaded Spotify, streaming, media tiles, and larger storage for music.

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

Onboard storage is a clear 2025 upgrade, repeatedly described as 64GB and useful for music, apps, and offline maps.

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

The operating system experience benefits from One UI 8/Wear OS updates, Gemini, Now Bar, and refreshed interface features.

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

Outdoor visibility is excellent, with multiple reviewers saying the bright display remains readable in sunlight.

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

Pairing and setup reliability are positive where tested, with instant recognition and quick setup noted.

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

Recovery-style insights are mixed: vascular load interests some reviewers, while HRV and related metrics draw skepticism.

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

Reliability is mostly acceptable but not flawless, with one review noting brief display interruptions and another calling performance not horrible rather than perfect.

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

Safety features include fall detection, emergency siren references, sleep apnea alerts, and related health/safety setup options.

Size options are limited by the single large 47mm format, though the band can fit a range of wrists and the screen size appeals to some users.

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

Sleep tracking is useful and improving, but reviewers disagree on sleep stages and awake-time accuracy.

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

Smartphone notifications are well supported, with reviewers noting detailed notification views and suggested replies.

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

Smartwatch features are broad, including LTE, calls, texts, Gemini, Now Bar, storage, and Samsung’s full watch software stack.

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

Software smoothness is generally good, with smooth app launches and more functional One UI behavior, despite occasional reliability caveats.

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

Step counting is positive in basic walking tests, but one reviewer notes accuracy drops when arms are not swinging.

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

Stress tracking is included in Samsung’s health sensor set, though the reviews provide feature evidence more than accuracy testing.

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

Style is divisive: some reviewers like the rugged, colorful, stylish look, while others find it bulky or not pretty.

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 solid through Google Play, fitness apps such as Strava and Map My Run, and a growing Wear OS app selection.

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

Touchscreen responsiveness and gesture operation are described as intentional and straightforward in the long-term review evidence.

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

The user interface is improved and functional, though some reviewers dislike parts of the visual layout.

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 for money is the main weak point because reviewers repeatedly question the high price and minimal 2025 hardware changes.

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 is a strength with Gemini, which reviewers describe as convenient, useful, and directly available on the wrist.

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

Watch faces are a strength, with reviewers praising quantity, customization, and Samsung’s polished face designs.

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

Water resistance is a strong feature, with reviews citing 5ATM/10ATM ratings, IP68 claims, and pool/rain/snow use.

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

Wellness insights are useful but uneven: sleep coaching and vascular load get interest, while energy score and antioxidant index receive skepticism.

Wi-Fi support is present across connectivity mentions, including LTE/Wi-Fi model references.

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

Workout variety is strong, with reviewers citing many tracked activities, multisport/triathlon capability, and broad exercise lists.