Nocturna

Year: 2026
Stack: Rust, Windows API (CoreAudio & Power Subsystem), Native Fluent UI
Platform: nocturna.kometa.cl · Windows 10 & 11 (64-bit)
Downloads: Windows Installer (~1.1 MB) · Portable Version (~3.2 MB) · VirusTotal Audit

The Problem: 20 Years of Clunky Commands and Bloatware

For more than two decades, scheduling a PC shutdown in Windows has been an archaic experience. Millions of users still rely on the tedious CMD command shutdown -s -t 3600 or abandoned utilities from the Windows XP era packed with invasive ads, suspicious installers, or pixelated interfaces.

Furthermore, traditional shutdown tools suffer from two critical flaws:

1. The “Alarm Clock Effect”: If you fall asleep listening to music, podcasts, or white noise on YouTube or Spotify, the abrupt silence when the PC cuts off causes micro-awakenings that ruin sleep quality.
2. False Shutdown Positives: If a background application hangs, prompts “Save changes?”, or if the timer app is accidentally closed, Windows aborts the shutdown sequence and leaves the machine running all night.

The Solution: Nocturna

I built Nocturna under the banner of Kometa Networks to deliver the definitive sleep timer for Windows. A modern desktop utility with native Windows 11 aesthetics, ultra-fast responsiveness, and complete respect for system resources and user privacy.

Key Features

• Gradual Audio Fade-Out: During the final 2 minutes prior to shutdown or sleep, Nocturna gently lowers the OS master volume step-by-step, allowing your mind to drift into natural silence.
• Windows Fail-Safe Delegation: If you accidentally close the window or terminate the process while a timer is active, Nocturna hands the remaining countdown over to Windows’ native shutdown.exe, ensuring your PC turns off no matter what.
• Smart Idle Sensor (Idle Mode): Allows you to trigger shutdown or sleep only after the computer has remained untouched for a specified duration—perfect for overnight Steam downloads or 3D renders in Blender without premature interruptions.
• OLED & IPS Screen Off Shortcut: Right-click the system tray icon to instantly shut down screen backlight without pausing background tasks or active downloads.
• Mini-Widget Mode: Collapse the window into an ultra-compact floating bar to monitor time remaining without obstructing games or movies.
• Keyboard Shortcuts: Pause with Space, cancel with Escape, or set instant presets with Ctrl+1 (15m), Ctrl+2 (30m), Ctrl+3 (1h), and Ctrl+4 (2h).
• Force Close Switch (/f): Guarantees clean shutdowns by terminating hanging apps that would otherwise block the OS from powering down.

Architecture and Rust Engineering

Unlike modern desktop utilities built on bloated Chromium/Electron wrappers (which easily consume 150+ MB of RAM just to render a clock), Nocturna was engineered with uncompromising efficiency:

• Pure Rust Architecture: High-performance native binaries without heavy runtime overhead.
• 1.08 MB Featherweight Footprint: The entire installer is around 1 MB and launches in milliseconds.
• ~3 MB Idle RAM Consumption: Minimized to the system tray, it is virtually invisible to the CPU and battery.
• Direct Windows CoreAudio Integration: Direct control over system audio endpoints without third-party drivers.
• Zero Telemetry & Zero Ads: 100% offline, requires no network access, and is verified clean on VirusTotal across 70+ antivirus engines.

Launch and Deep Dive

Explore the full engineering story and background in the official blog launch post.