COROS Apex 4: specs, who it fits and compatible phones
COROS Apex 4 is a sport watch released in 2025 that works with iPhone and Android. It lists Dual-band GNSS + maps, 5ATM and Sapphire.
Specifications
| Release year | 2025 |
|---|---|
| Case size | 42 / 46 mm |
| Display | MIP |
| Battery as listed | Up to 65 GPS hours (46 mm) |
| Water rating | 5ATM |
| Glass | Sapphire |
| Case material | Grade-5 titanium |
| GPS type | Dual-band GNSS + maps |
| Offline maps | Yes |
| Operating system | COROS OS |
| Works with | iPhone and Android |
| Connection | None |
| Plan needed | None |
| Health sensors | SpO2, HRV, Readiness score |
Who it fits
- Works with iPhone and Android.
- Lists dual-band GPS and offline maps, which suits running and hiking.
- Lists an exact water rating of 5ATM or higher.
How it compares
Closest models from COROS
| Model | Release year | Case size | Battery as listed | Water rating | GPS type | Works with |
|---|---|---|---|---|---|---|
| COROS NOMAD | 2025 | 46 mm | Up to 22 days; 50 hours All-Systems GPS | 5ATM | Dual-band GNSS + maps | iOS and Android |
| COROS PACE Pro | 2024 | 46 mm | Up to 20 days · 38 GPS hours | 5ATM | Dual-band GNSS + maps | iOS and Android |
| COROS Vertix 2S | 2024 | 50.3 mm | 40 days · 118 GPS hours (approx.) | 10ATM | Dual-band GNSS + maps | iOS and Android |
Closest models from other brands
| Model | Release year | Case size | Battery as listed | Water rating | GPS type | Works with |
|---|---|---|---|---|---|---|
| Amazfit T-Rex 3 Pro | 2025 | 48 mm | 25 days (approx.) | 10ATM | Dual-band GNSS + maps | iOS and Android |
| Garmin Forerunner 970 | 2025 | 47 mm | Up to 15 days | 5ATM | Dual-band GNSS + maps | iOS and Android |
| Garmin tactix 8 AMOLED | 2025 | 47 / 51 mm | Up to 16 days (47 mm) · 29 days (51 mm) | 10ATM | Dual-band GNSS + maps | iOS and Android |
Compared with COROS PACE Pro, COROS Apex 4 lists a newer release year (2025 against 2024) and Grade-5 titanium case material, where COROS PACE Pro lists Fiber-reinforced polymer.
Compared with COROS Vertix 2S, COROS Apex 4 lists a lower ATM rating (5 against 10), a newer release year (2025 against 2024) and Grade-5 titanium case material, where COROS Vertix 2S lists Titanium.
Compared with Amazfit T-Rex 3 Pro, COROS Apex 4 lists a lower ATM rating (5 against 10) and Grade-5 titanium case material, where Amazfit T-Rex 3 Pro lists Titanium.
Compared with Garmin Forerunner 970, COROS Apex 4 lists Grade-5 titanium case material, where Garmin Forerunner 970 lists Titanium bezel.
Compared with Garmin tactix 8 AMOLED, COROS Apex 4 lists a lower ATM rating (5 against 10), Grade-5 titanium case material, where Garmin tactix 8 AMOLED lists Titanium and case sizes of 42 / 46 mm against 47 / 51 mm.
Only values listed exactly are compared.
Phone compatibility and plan
No plan is listed as needed.
Sensors and features are listed as the maker names them and are not medical measurements.
Related guides and lists
- Battery life explained
- Phone compatibility
- Water resistance ratings
- Sensors explained
- COROS smartwatches
- All models
Last verified September 26, 2026
Features change with updates. Check the maker's current details. See our methodology