Apps by CELEST Watches

A sweeping seconds hand, 1/20-second, minute and hour subdials, and a constant-speed reset flyback — driven entirely from the watch face. A genuine analog stopwatch, not a printed-on decoration.

Retro Watch Complication is a companion app that provides alarm, chime, stopwatch, and countdown functionality to compatible WFF (Watch Face Format) watch faces. You need to install both the watch face and this companion app for the features to work.

A real four-function calculator that lives inside your watch face.This is the brain. The buttons live on a watch face that knows how to talk to it. Together they give you something most "calculator watch faces" only pretend to be: a calculator that actually works.

Wear OS complications that display your daily activity and heart-rate trends as bar charts or short text. Place them on any watch face with compatible complication slots — pick a metric, pick a shape, fill each slot.

A standalone compass complication for Wear OS, designed to integrate into any watch face that exposes complication slots.

A blood pressure log that keeps your readings in your own Google Drive — no account, no subscription, and no server of mine that could see them.

For people who need to tell a doctor what actually happened, and when — instead of “it’s been bad lately, I think since maybe March?” It lives in your own Google Drive.

A clean and private habit tracker designed to help you break unwanted habits or build better ones. Log your progress, understand your triggers, and stay motivated on your journey toward positive change. Simple, distraction-free, and focused on real results.

Track your intermittent fasting windows with clarity and minimalism. Easily set your fasting and eating periods, get gentle reminders, and maintain consistency without unnecessary features or clutter.

The most straightforward interval timer for your workouts. Quickly set work and rest periods, use it on your phone or directly on your Wear OS watch, and keep your attention on training instead of counting time. Great for HIIT, Tabata, circuits, and more.

No account. No subscription. No tracking.

A minimalist timer and focus tool to help you stay concentrated and productive. Clean design, no ads, no distractions — just a beautiful way to manage your time and deep work sessions.

A beautifully simple e-book reader that lets you focus on reading. No accounts, no tracking, no bloat — just clean typography, comfortable formatting, and a distraction-free experience.

Make learning Morse code fun and straightforward. Practice reading, listening, and sending messages while tracking your progress. Perfect for hobbyists, radio enthusiasts, or anyone who enjoys picking up a new skill.

You move around. Sometimes on two wheels, sometimes on four, sometimes on one of those electric unicycle things that make pedestrians nervous. Point is, you occasionally wonder "how far did I actually go?" and "was that really 120 km/h or is my car's speedo lying to me again?"

A minimal home screen widget for counting anything with a single tap. Pick from 20 color themes, resize it to fit your layout, and track multiple things at once.

Toggle Wireless Debugging (ADB over Wi-Fi) directly from your home screen with a single tap. No navigating through Developer options, no pulling down Quick Settings — just the switch you need, where you need it.

The simple Hungarian name day app that tells you who is celebrating today and tomorrow — and then leaves you in peace.

Six themes for Thunderbird and Betterbird that take out the boxes, borders and extra shades of gray, leaving your mail on two calm surfaces. They come in light and dark, a Mono version of each with one background colour everywhere, and Auto versions that switch between light and dark with your system.