Sizometry

APEX 4 42mm Front view

Official manufacturer render.

COROS

APEX 4 42mm

Watch2025Released
  • 1.2-inch Memory-in-Pixel (3rd gen MIP touch)
  • All-satellite dual-frequency GNSS
  • 44 g
  • From $429

Physical specifications

1.2"

Display size

44 g (with nylon band)

Weight

42.6 mm

Height

42.6 mm

Width

14.0 mm

Thickness

—

Aspect ratio

Everyday usability

Estimated from the watch’s size, weight, battery, display, and intended wearing conditions.

  • Wrist comfort

    Noticeable

    The larger case gives it a noticeable wrist presence, especially on smaller wrists.

  • Sleep comfort

    Noticeable

    Its thickness and larger footprint may remain noticeable when sleeping.

  • Battery usability

    Data unavailable

    Available battery information is insufficient for a reliable daily-use assessment.

  • Screen and controls

    Good

    Detailed brightness information is unavailable, so outdoor visibility cannot be fully assessed.

  • Workout usability

    Excellent

    Its low weight, water resistance, and GPS support make it well suited to running and gym sessions.

See its real size next to another watch.

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Display

Display size
1.2"
Display technology
Memory-in-Pixel (3rd gen MIP touch)
Resolution
240 × 240
Protection
Sapphire glass

Performance

Chipset
All-satellite dual-frequency GNSS
Storage
32 GB
Expandable storage
No

Battery & charging

Charging standard
Magnetic charging (<2 h). Daily use 15 days; all-systems GPS 34 h; dual-frequency GPS 26 h; Endurance all-systems 41 h (extended mode — not everyday life); music modes shorter
Battery type
Lithium-ion

Build & durability

Frame
Fiber-reinforced polymer; Grade 5 titanium bezel
Back
Fiber-reinforced polymer
Front
Sapphire glass
Ingress protection
5 ATM

Connectivity

Cellular
GPS / GLONASS / Galileo / BeiDou / QZSS (dual-frequency), Downloadable global Landscape / Topo maps, Speaker + dual microphone, ECG sensor
Wi‑Fi
Wi-Fi / COROS App
Bluetooth
Bluetooth

Release and pricing

Announced
October 15, 2025
Released
October 15, 2025
Starting price
$429
Market
US

Buying guide FAQ

Practical upgrade and buying answers based on published specifications and previous-generation comparisons when available.

Who should buy COROS APEX 4 42mm (2025)?

COROS APEX 4 42mm (2025) fits buyers who prefer a compact phone footprint. This is an editorial reading of size and published differences, not a personalized recommendation.

Considering another COROS APEX 4 42mm model?

Similar size devices

Models and configurations

Storage
32 GB
Connectivity
GPS / GLONASS / Galileo / BeiDou / QZSS (dual-frequency)Downloadable global Landscape / Topo mapsSpeaker + dual microphoneECG sensor

Official sources

Dimensions and specifications are based on manufacturer-published data. Learn more in our Methodology