Amazfit Active 2 VS Xiaomi Watch S4 41mm

Both watches share a 1.32″ OLED/AMOLED display with an identical 466 × 466 px resolution, Always-On Display, sapphire glass, and a replaceable band — so on the surface they look like near-twins. The meaningful divergence starts with pixel density: the Amazfit Active 2 renders at 353 ppi versus 320 ppi on the Xiaomi Watch S4. On a sub-1.5″ screen that difference is visible — text and watch-face details will appear marginally crisper on the Active 2, which matters if you use data-dense sport or navigation faces.

Form factor tells the opposite story. The S4 is the more compact and refined package: its 41.2 × 41.2 mm case is notably smaller than the Active 2's 43.9 × 43.9 mm, it is 0.4 mm thinner (9.5 mm vs 9.9 mm), and its volume is roughly 15% smaller (16.1 cm³ vs 19.1 cm³). The Active 2 does weigh less at 29.5 g against the S4's 32 g, but the S4's smaller footprint means it will sit less prominently on smaller wrists, which many users will find more comfortable day-to-night.

There is also a durability distinction worth noting: the S4 is rated Waterproof while the Active 2 is listed as merely Water resistant — both share a 5 ATM pressure rating, but the explicit ″Waterproof″ classification on the S4 implies a more robust seal certification in practice. Overall, the Amazfit Active 2 has a slight edge in display sharpness, while the Xiaomi Watch S4 holds a clear advantage in compactness and water protection — making the better pick largely a matter of whether you prioritize a crisper screen or a sleeker, slightly more rugged case.

The Amazfit Active 2 and the Xiaomi Watch S4 41mm are equipped with nearly identical sets of sensors. Both devices monitor blood oxygenation levels, have heart rate monitors, and feature GPS. They also come with accelerometers, temperature sensors, compasses, barometers, and gyroscopes. The only difference in their sensor arrays is that the Amazfit Active 2 includes a cadence sensor, which the Xiaomi Watch S4 41mm lacks. Additionally, neither watch monitors perspiration.

In summary, both devices share a robust suite of sensors, making them well-equipped for tracking various physical activities. The key distinction is that the Amazfit Active 2 offers a cadence sensor, while the Xiaomi Watch S4 41mm does not.

The Amazfit Active 2 and the Xiaomi Watch S4 41mm offer nearly identical activity tracking features. Both devices track sleep, distance, steps taken, and pace. They also provide sleep reports, automatically detect activities, and include route tracking and elevation tracking. Additionally, both devices have exercise tagging, stroke counters for swimming, and the ability to track calorie intake.

Both watches are not designed for diving, but they provide extensive support for other activity-related tracking. There are no differences between the two products in this category, as both offer the same set of features and capabilities for activity tracking.

The Amazfit Active 2 and the Xiaomi Watch S4 41mm differ in a few connectivity features. The Amazfit Active 2 does not have a cellular module but supports Bluetooth version 5.2, Wi-Fi, and NFC. However, it does not support ANT+ or Galileo. In contrast, the Xiaomi Watch S4 41mm includes a cellular module, which the Amazfit Active 2 lacks, and supports Bluetooth version 5.4. Unlike the Amazfit Active 2, the Xiaomi Watch S4 41mm does not support Wi-Fi but does support Galileo and NFC, just like the Amazfit Active 2.

Both watches are compatible with iOS and Android devices, ensuring a wide range of compatibility for users. However, the inclusion of a cellular module in the Xiaomi Watch S4 41mm gives it an edge for standalone connectivity, unlike the Amazfit Active 2, which relies more on Wi-Fi and Bluetooth for communication.

The Amazfit Active 2 and the Xiaomi Watch S4 41mm have different battery specifications. The Amazfit Active 2 offers a battery life of 10 days with a 270 mAh battery, while the Xiaomi Watch S4 41mm provides 8 days of battery life and a larger 320 mAh battery. The Amazfit Active 2 does not support wireless charging, whereas the Xiaomi Watch S4 41mm supports wireless charging.

Both watches feature rechargeable batteries, and neither has a solar power battery or a removable battery. While the Xiaomi Watch S4 41mm has a slightly larger battery and supports wireless charging, the Amazfit Active 2 offers a longer battery life overall.

The Amazfit Active 2 and the Xiaomi Watch S4 41mm offer similar features, but there are a few differences. Both watches support HRV tracking, measure VO2 max and resting heart rate, and provide notifications for fast/slow heart rate, along with readiness levels. They also both allow users to answer calls, locate their phones, and have call control, silent alarms, vibrating alerts, a stopwatch, and a built-in camera remote control function.

The key distinction is that the Xiaomi Watch S4 41mm includes fall detection and acquires GPS faster, which the Amazfit Active 2 does not have. Both watches feature a single microphone and lack a front camera. Neither watch offers irregular heart rate warnings or ECG technology.

Overall, both watches are equipped with comprehensive tracking and notification features, but the Xiaomi Watch S4 41mm stands out with fall detection and faster GPS acquisition.

The Amazfit Active 2 and the Xiaomi Watch S4 41mm offer many similar features in their app and software capabilities. Both provide activity reports, inactivity alerts, calorie counting, goal setting, achievements, a free app, an exercise diary, ad-free experiences, temperature tracking, period notifications, music playback, maps, ovulation predictions, start date predictions, widgets, personalization, water intake tracking, and weight tracking. Both devices also sync with existing calendars.

However, there are a few differences between the two. The Amazfit Active 2 includes coaching features and supports routes, which are not available on the Xiaomi Watch S4 41mm. On the other hand, the Xiaomi Watch S4 41mm lacks coaching but still supports all other features found in the Amazfit Active 2.

Both devices lack a barcode scanner in their app, but overall, their app functionalities are quite similar, with the Amazfit Active 2 offering slightly more in terms of coaching and route support.

The Amazfit Active 2 and the Xiaomi Watch S4 41mm share identical specifications in the miscellaneous category. Both devices feature a battery level indicator, passcode protection, and do not support external memory slots or 3.5 mm audio jack connections. Additionally, neither device is compatible with Windows or Mac OS X.

As a result, in this category, both watches offer the same set of functionalities, with no distinguishing factors between them.