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vladelaina/Catime

Free

💌A tiny (995KB) but mighty timer in **pure C** ! — almost no memory usage!❤️‍🔥 Supports clock, countdown, stopwatch, Pomodoro, and fully customizable tray animations (GIFs, CPU/Mem%) 💘 Don't be shy, join here🧸: https://discord.com/invite/W3tW2gtp6g

FreeFree tier
Type
Open Source
Visit Website GitHub (38 stars)

About vladelaina/Catime

Catime is an ultra-lightweight Windows countdown and Pomodoro tool written in pure C with a clean transparent interface, rich customization, powerful shortcuts, and almost no resource usage. It supports clock, countdown, stopwatch, and Pomodoro modes, and features customizable tray animations using GIF, WebP, ANI, and static images, as well as real-time display of system status (CPU%, Memory%, Battery%, Caps Lock). Catime also supports a simple plugin system where external programs can write to a text file for display. The application is only 995KB in size and can be installed via GitHub Releases, Scoop, or Winget.

Key Features

Ultra-lightweight (995KB) with minimal memory usage
Written entirely in pure C
Supports clock, countdown, stopwatch, and Pomodoro modes
Clean transparent user interface with edit mode for drag and resize
Customizable tray animations using GIF, WebP, ANI, and static images
Real-time system status display (CPU%, Memory%, Battery%, Caps Lock)
Plugin support via simple file-based input (./output.txt)
Powerful keyboard shortcuts
Font simplification tool to reduce custom font file size by 90%+
Configuration file saved at %LOCALAPPDATA%\Catime\config.ini

Pros & Cons

Pros
  • Extremely lightweight (995KB) with minimal memory footprint
  • Open source and completely free
  • Highly customizable with tray animations, fonts, and shortcuts
  • Multiple timer modes in a single tool
  • Plugin extensibility for custom integrations
  • Supports multiple installation methods (GitHub, Scoop, Winget)
Cons
  • Windows-only application (no macOS or Linux support)
  • Manual configuration via text file (no graphical settings UI)
  • Plugin mechanism is simple and may lack advanced integration options
  • Limited documentation for beginners

Best For

Personal productivity and time managementPomodoro technique for focused work sessionsCooking or exercise countdown timerStopwatch for timing tasksSystem resource monitoring through tray icons

FAQ

How do I download and install Catime?
Catime can be downloaded from GitHub Releases, or installed via Scoop (scoop install catime) or Winget (winget install --id VladElaina.Catime).
What platforms does Catime support?
Catime is currently available only on Windows.