Cronosurf Wave Pro is a chronograph watch app for Android devices and a watchface for Wear OS watches. No other OS are supported for now. Note: Due to latest Google policies allowing only WFF watch faces on the Play Store (from 2026 on), we had to remove the Wear OS version from this release. Previously installed watch faces will continue to function.

This app is based on the original design started 2014 as a web-based technology demonstrator (cronosurf.com). Its main focus lays on design, functionality and usability. If you are a chronograph watch lover, you'll find yourself using Cronosurf as your day-to-day app for alarm, countdown timer and stopwatch!

Since Cronosurf has many features, the app includes a comprehensive user manual. The Button Assistant is now integrated in the app (portrait mode). Use it to quickly getting familiarized with the basics. To activate it, tap on the area above the watch.

Optional "Android Smartwatch Mode" for standalone Android watches (Cronosurf runs as an app on these devices, not as a native watchface).

Key features
- 12-Hour Stopwatch with 1/20 seconds resolution
- 12-Hour Countdown-Timer (CD) with optional automatic repetition
- Daily/Once Alarm (AL) with optional gradual volume
- Optional vibration for AL/CD signals
- Customizable presets for both AL and CD
- UTC-based world time with 15-minute steps
- Current date, day of the week and the unique Cronosurf's monthly calendar
- Innovative 100-year-Calendar
- Week number
- Indication of moon phases
- Compass (when supported by device)
- Screen-On timer
- Analog and digital battery indicators
- Seconds hand: pulse or sweep motion
- Set mode supports set-by-drag
- Flashlight function
- Day/Night modes
- Tachymeter in stopwatch mode (experimental)
- Live Wallpaper (basic interactivity, customizable background, adjustable size/position; enable it like any other LWP)
- Lots of extra functionality you've probably never seen on other chronographs

For users who already have the Wear OS version installed (legacy users):
- Wear OS: Optional Day/Night mode switching at fixed times, at sunrise/sunset or via light sensor
- Wear OS + Android standalone: Auto-Return to TME mode after 1.5 minutes; long press [B] disables for current mode till next mode change
- Wear OS: Optional minimalist ambient mode

PRO VERSION features
- Ad-free
- 5 customizable colors presets
- 8 instead of 2 presets each for AL and CD
- Secondary world time
- Quick stopwatch (one button press from time mode)
- Split function for the stopwatch
- Flyback chronograph function
- Thousandths of a second for stopwatch
- Tachymeter + Telemeter in stopwatch mode (experimental)
- Reference pointer for the compass
- Compass rose (experimental)
- Weather information for a user defined location: Temperature and humidity, sunrise/sunset times
- Landscape mode support
- For the Live Wallpaper, any image from the gallery can be set as a background image

WEAR OS (legacy users):
- 60-minute bezel
- Automatic Day/Night mode switching additionally at sunrise/sunset times
- Party Mode (automatic color change every couple of minutes)
- Optional hourly chime
- Step counter (experimental)
- Ambient mode brightness reduction options, 25% and 50%
- Button lock
- Info box with watch temperature

Permissions:
- Storage: Image loading for the LWP
- Run at startup: For reactivating a pending AL/CD.
- Prevent device from sleeping: While an alarm is being played, so the user can stop it
- Allow display over other apps: (Android 10+ only) To bring the app in the foreground when an AL/CD is triggered

SEPARATE MANUALS AND FAQ: cronosurf.com/support