Amazfit Active Max vs Xiaomi Watch S4
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At a glance
Key specifications and important differences. Full details follow below.
| Feature |  Amazfit Active Max |  Xiaomi Watch S4 |
|---|---|---|
| Price | KSh 24,000.00 | KSh 20,000.00 |
| Display | 1.5-inch AMOLED touchscreen | 1.43-inch AMOLED, 60 Hz |
| Battery capacity | 658 mAh rated | 486 mAh |
| Water resistance | 5 ATM | 5 ATM rated for suitable shallow-water activities |
| Storage | 4 GB | — |
| Operating system | Zepp OS 6 | Xiaomi HyperOS 2 |
| Network / cellular | No cellular network support documented | — |
| Positioning / GNSS | Built-in five-satellite positioning | Built-in GPS, Galileo, GLONASS, BeiDou and QZSS |
| Health & wellness features | Heart rate, blood oxygen, stress, BioCharge, LifeLoad and one-tap health measurement; wellness readings are not intended for medical diagnosis | Heart rate, blood oxygen, stress, breathing and activity tracking; wellness data is not intended for medical diagnosis |
Full specifications
2 of 4 products
| Specification | Amazfit Active Max | Xiaomi Watch S4 |
|---|---|---|
| Identity & design | ||
| Brand | Amazfit | Xiaomi |
| Model | Active Max | Xiaomi Watch S4 |
| Announced | December 2025 | March 2025 (global model) |
| Dimensions | 48.5 × 48.5 × 12.2 mm without heart-rate sensor base | 47.3 × 47.3 × 12.0 mm (strap and protrusions excluded) |
| Weight | 39.5 g without strap | Approximately 44.5 g (strap excluded) |
| Build materials | Aluminum-alloy frame and polymer case with strengthened glass | Aluminum-alloy frame with interchangeable bezel |
| Wrist size | — | Black/Silver: approximately 140–210 mm; Rainbow: approximately 135–210 mm |
| Strap / band | 22 mm silicone strap with classic pin buckle | Fluororubber; Rainbow configuration also includes nylon strap |
| Controls / buttons | Two physical buttons and touchscreen | Rotating crown, side control, interchangeable bezel interaction, and touchscreen |
| Display | ||
| Display | 1.5-inch AMOLED touchscreen | 1.43-inch AMOLED, 60 Hz |
| Screen resolution | 480 × 480 pixels, 323 ppi | 466 × 466 pixels (~326 ppi) |
| Display protection | Strengthened glass with anti-fingerprint coating | — |
| Display features | Always-on display; up to 3,000 nits peak brightness | Always-on display; up to 1,500 nits HBM |
| Performance & software | ||
| Storage | 4 GB | — |
| Operating system | Zepp OS 6 | Xiaomi HyperOS 2 |
| Connectivity | ||
| Network / cellular | No cellular network support documented | — |
| SIM / eSIM | No SIM or eSIM support documented | — |
| Wi-Fi | No Wi-Fi support listed | — |
| Bluetooth | Bluetooth 5.3 BLE | Bluetooth 5.3 |
| NFC | NFC support not listed for this configuration | Supported; availability varies by region |
| Positioning / GNSS | Built-in five-satellite positioning | Built-in GPS, Galileo, GLONASS, BeiDou and QZSS |
| Ultra Wideband (UWB) | UWB support not listed | — |
| Satellite features | No satellite messaging feature documented; GNSS positioning is listed separately | — |
| Audio & communication | ||
| Speaker | Built-in speaker | Built-in speaker |
| Microphone | Built-in microphone | Two built-in microphones |
| Calling | Bluetooth calling and Android message replies when paired | Bluetooth calling when paired with a compatible phone; third-party app voice calls not supported |
| Sensors, health & fitness | ||
| Sensors | BioTracker PPG sensor, accelerometer, gyroscope, geomagnetic sensor, barometric altimeter, ambient-light sensor and temperature sensor | Heart-rate/blood-oxygen sensor, accelerometer, gyroscope, ambient-light sensor, electronic compass, barometer and Hall sensor |
| Health & wellness features | Heart rate, blood oxygen, stress, BioCharge, LifeLoad and one-tap health measurement; wellness readings are not intended for medical diagnosis | Heart rate, blood oxygen, stress, breathing and activity tracking; wellness data is not intended for medical diagnosis |
| Sleep tracking | RestoreIQ sleep quality, stages, breathing patterns and naps | Sleep monitoring supported |
| Sports / workout modes | More than 170 sports modes with smart strength-training recognition | More than 150 sports modes |
| Training & outdoor features | Zepp Coach, PeakBeats, offline maps, route navigation, virtual pacer and compatible workout peripherals | — |
| Diving / depth features | Not rated for diving; water resistance is 5 ATM | — |
| Battery & durability | ||
| Battery capacity | 658 mAh rated | 486 mAh |
| Battery life | Up to 25 days typical use, 13 days heavy use, 10 days always-on display or 64 hours continuous GPS | Up to 15 days typical use; actual life varies by settings and use |
| Charging | Magnetic charging head | 2-pin magnetic charging dock |
| Water resistance | 5 ATM | 5 ATM rated for suitable shallow-water activities |
| Compatibility | ||
| Phone compatibility | Android 7.0 or later; iOS 14.0 or later | Android 8.0 or later; iOS 14.0 or later |
| Companion app | Zepp app | Mi Fitness |
| Colors | Black | Black, Silver, or Rainbow depending on configuration |
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