Compare CMF Watch 3 Pro vs Samsung Galaxy Watch Ultra (2025)

Activity auto-detection exists and can work for walks and common activities, but one reviewer warns that manual workout starts are still safer.

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 app ecosystem is limited: syncing with fitness services helps, but the proprietary OS lacks the breadth of Wear OS or full third-party app access.

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

Band quality is mixed: several reviewers like the soft, replaceable strap, while others call it floppy, lighter-quality, or irritating.

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 strongest points, with many reviewers seeing multi-day to week-plus endurance and some highlighting 13-day claims or better-than-expected results.

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, with alerts or spot readings mentioned, and one reviewer found readings close to a pulse oximeter, though reviewers did not deeply validate it.

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

Bluetooth connectivity is mostly stable once paired in positive reviews, though one reviewer notes the connectivity stack is limited to Bluetooth Low Energy.

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

Brightness is adequate in some normal situations, but reviewers often call it low by current standards or wish it were brighter.

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

Build quality divides reviewers: several find the fit and finish surprisingly good for the price, while others call it cheap, plasticky, rattly, or toy-like.

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

Button controls are mostly liked, especially the crown, haptics, and shortcuts, but reviewers also note size or underused crown interactions.

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.

Call handling is better than expected for a budget smartwatch, with reviewers reporting usable microphones and clear calls, though speaker loudness can limit outdoor use.

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

Calorie data is useful as part of workout summaries for casual tracking, but reviewers treat it as general guidance rather than laboratory-grade measurement.

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 a consistent complaint because the proprietary magnetic connector is flimsy, easy to dislodge, or awkward to use.

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

Charging speed is acceptable rather than exceptional, usually described around 90 to 99 minutes for a full charge or decent partial top-ups.

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

Coaching features are a clear selling point, especially the running coach and AI plan guidance, although reviewers treat it as helpful rather than flawless.

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

Comfort is generally helped by the low weight, though size, poor fit for some wrists, and one uncomfortable experience keep it from being universally comfortable.

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

The companion app is cleaner and more polished than before, but limitations around workout records, battery drain, language issues, exports, and data depth remain.

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

Contactless payments are a clear miss: multiple reviewers note the absence of NFC or wallet payments.

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

Cross-platform compatibility is a strength for a budget watch, with reviewers noting Android and iPhone support and basic assistant use across 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 mixed: watch faces, widgets, gestures, AOD and bands give flexibility, but the lost interchangeable bezel and limited widget or face storage disappoint reviewers.

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

Display quality is generally praised for the AMOLED panel, larger size, sharpness, and readability indoors, even when brightness has limits.

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

Durability evidence is limited but mixed: one reviewer noticed an early screen scratch, while another found the body and screen held up after daily use and a drop.

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 a weakness for smaller wrists in the available evidence, with reviewers noting poor fit or the watch being too large.

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

Fitness tracking accuracy is acceptable for casual use in some reviews but unreliable in others, especially for sleep-related confidence, workouts, running, and weightlifting.

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

GPS is generally praised after the upgrade to dual-band tracking, with fast lock times and strong route accuracy, though one scientific reviewer questioned recording frequency.

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

Reviewers describe the health suite as broad for the price, with heart rate, sleep, stress and blood oxygen options, but accuracy and depth are inconsistent across tests.

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 one of the most divided areas: some reviewers saw close agreement with reference devices, while others found misses during runs, workouts, or loose wear.

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 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 are mixed, with metal or aluminum elements helping the watch feel better than expected, but plastic backs, bezels, and sensor areas reduce the premium feel.

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

Menu navigation is straightforward and crown-assisted, though some reviewers note the interface does not fully exploit the crown or gestures.

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

Music controls are useful for phone playback, including album artwork in one review, but the watch is not presented as a standalone music device.

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

Onboard music storage is absent, limiting the watch for phone-free exercise with wireless earbuds.

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

The operating system experience is repeatedly described as polished, smooth, and quality-feeling for the price.

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

Outdoor visibility is a recurring weakness, especially with the always-on display, direct sunlight, or polarized sunglasses.

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

Pairing reliability is mixed: some reviewers found setup or phone switching easy, while others had a difficult pairing process or disconnections from the app.

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

Recovery insights show up as estimated recovery time, VO2 max, training load, and recovery metrics, giving runners and casual athletes more guidance than expected at this price.

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

Reliability is mixed, with reviewers citing notification sync issues, app optimization problems, app disconnects, and work-in-progress software behavior.

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

Size options are limited to one case size, which reviewers repeatedly flag as a problem for smaller wrists.

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 ranges from impressive duration or comparative results to very poor awake detection, so reviewers do not agree that it is dependable for serious sleep analysis.

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

Notifications are useful for quick wrist checks and preset replies, but syncing and clearing behavior can be one-way or limited depending on phone platform.

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

Smartwatch features cover basics such as notifications, camera shutter, calls, recorder, weather, music control, calendar, assistant access, and news, but not advanced platform features.

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

Software smoothness is generally strong, with several reviewers praising fluid animations and scrolling, but one negative review saw lag and another saw small pauses.

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

Step-counting evidence is limited and mixed, with one reviewer seeing a sizeable difference between the watch and Google Fit by the end of the day.

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

Stress tracking and guided breathing are repeatedly mentioned, but at least one long-term reviewer found stress readings temperamental and not reflective of real stress.

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

Style and design are among the most praised areas, although a few reviewers dislike the plasticky or average feel.

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

Third-party app support is weak because reviewers repeatedly note that apps cannot be installed or accessed like on fuller smartwatch platforms.

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.

Touchscreen responsiveness is mixed: some reviewers praise smoothness while others report lag, missed swipes, or always-on behavior that does not work as expected.

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

The user interface earns praise for being clean, polished, readable, and visually appealing, especially with Nothing's minimal monochrome style.

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

Value for money is strong overall because many reviewers find the design, display, battery, GPS, and basics impressive for around $99, despite harsher dissent.

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

Voice assistant support is useful when it triggers Siri, Gemini, or ChatGPT through a compatible phone, but ChatGPT support is limited and inconsistent across phones.

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

Watch faces are a standout design strength, with many reviewers praising the quantity, style, AOD support, and creative video or AI face options.

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

Water resistance is a major caveat: ratings are mentioned repeatedly, but reviewers stress that swimming, pools, oceans, or showers are not recommended.

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

Wellness insights are shallow compared with the raw metrics: reviewers wanted more written explanations or practical advice from sleep and health data.

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

Wi-Fi is not available according to the reviewer evidence, which limits independent connectivity.

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

Workout variety is a major strength: reviewers consistently note the huge list of sports modes, often around 131 options, covering mainstream and niche activities.

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