Noctua

A beautiful, minimal clock app for Linux and Android.

Animated backgrounds. Per-screen colours. Alarms that fire.

Made by 🌈 opennomad ✨ · Codeberg · GitHub

Noctua would love to learn new animations, and other things. A cup of coffee will help us get there.

☕ Ko-fi · ❤️ Liberapay

Screenshots

Horizontal swipe, arrow keys, or the icon pills on the left edge.

Clock

Digital time and date. Configurable font and colour. Moon icon toggles night mode — dimmed display, no seconds or date.

World Clock

Search 115 cities or add a custom UTC offset. Drag to reorder. DST-aware.

Alarm

Alarm screen placeholder One-shot and repeating alarms. Emoji shortcode labels (:bell:, :fire:, :pizza:). Day-of-week toggles. Dismiss or snooze 10 min.

Timer

Timer screen placeholder Scroll-drum input. Multiple simultaneous timers. Saved presets with emoji names. State persists across restarts.

Stopwatch

Stopwatch screen placeholder Lap recording with fixed-width layout.

Settings

Settings panel Animation, font, time format, colour mode (dark/light/system), alarm and timer sounds, per-screen colour, keyboard shortcuts.

Features

Animated Backgrounds

Five styles — Lava Lamp, Raindrops, Bubbles, Breath, or None. Bubbles runs on the GPU via GLSL. Breath is a morphing organic blob. Speed, density, and amplitude are tunable.

Per-Screen Colour

Each screen gets its own colour. Pick from named presets (blue, purple, green) or dial in a custom hue. Independent settings for dark and light modes.

Sound Selection

Android pulls ringtones directly from the system. On Linux, any .oga or .wav in /usr/share/sounds/freedesktop/stereo is available. Separate pickers for alarm and timer.

24h / 12h Format

One tap in settings. Applies everywhere — Clock, World Clock, alarm list, and time picker.

Saved Timer Presets

Name presets with emoji shortcodes — :tea:, :pomodoro:, :pizza:. Type :te and a suggestion row appears. New presets activate immediately on save. Edge pills on the left auto-hide after 3 seconds.

Keyboard Navigation

Arrow keys cycle screens. Bindings are configurable. Disabled automatically while typing.

Settings Overlay

Tap anywhere to reveal the gear icon. It hides after 3 seconds. The sheet covers animation, font, time format, colour mode, sounds, per-screen colour, and keyboard bindings.

Config File

JSON at ~/.config/noctua/noctua_config.json (Linux) or app documents (Android). Hand-edit if you want.

Getting Started

Requirements

Platform	Minimum
Linux	GTK 3, PulseAudio (`paplay`)
Android	API 21 (Android 5.0)

Linux (from source)

git clone https://github.com/opennomad/noctua.git
cd noctua
mise exec -- flutter run -d linux

mise manages the Flutter and Dart toolchain. Install it first if you haven't, then run mise install in the project root.

Android (prebuilt)

Android (from source)

mise exec -- flutter run

On first launch Noctua requests notification, exact alarm, and full-screen intent permissions. All three are needed for alarms to fire and show on the lock screen.

Linux (prebuilt)

Download and extract the tarball, then run noctua:

Technical

Built with Flutter 3.41 / Dart 3.11.

Package	Purpose
`flutter_local_notifications`	Alarm and timer notifications on Android
`timezone`	DST-correct world clock and alarm scheduling
`google_fonts`	Runtime font loading
`path_provider` · `xdg_directories`	Platform config paths

Source: github.com/opennomad/noctua

Noctua — named for the little owl.