Simple Interval Timer

CELEST Watches

About this app

⏱️ Simple Interval Timer – Perfect for Every Workout

The easiest way to time your workouts on your Android phone or Wear OS watch. Designed for athletes who want results, not complications.


💪 What It's For

HIIT training, CrossFit WODs, boxing rounds, Tabata workouts, circuit training, gym sessions, running intervals, and any sport requiring timed work/rest periods.


⚙️ Super Simple to Use

• Set your warmup time
• Choose work and rest durations
• Pick number of rounds
• Add cooldown period
• Press START and train


🧠 Smart Features

• 🎨 Color-coded phases (never lose track of where you are)
• 🔊 Audio beeps at phase transitions (train without looking at your watch)
• 👀 Large, clear timer display
• 🛠️ Customizable for any workout style
• 🚫 No ads, no distractions

The app adapts to your device language and is available in multiple languages. Translations are provided via Google Play to make the app accessible worldwide.

(If you want to help fix errors in translation, please write to [e-mail])

❤️ Why Athletes Love It

Clean interface. No learning curve. Just open, set, and go. Perfect for when you need to focus on training, not your timer.

⭐ Get fit. Stay simple. Install now.

What’s new

Wear OS app changes:
- Implemented a potential fix for audio crackling during beeps.
- Added an option to use sound, vibration, or both for feedback.
- The app now remembers your most recent workout settings.
- Laid the groundwork for multilingual support by enabling automatic translation.
Please note: All the above listed changes have been implemented for the phone app in the previous release.