Version 2.1.0 Available

Sync your Windows theme with the sun

AutoSwitchTheme automatically switches between light and dark modes based on sunrise and sunset times. A natural visual experience.

Download Free View on GitHub
100%
Free
Win 10/11
Compatible
Open Source
MIT License
Icon AutoSwitchTheme
Soleil
Light Mode
Active until sunset
Sunrise
07:42
Sunset
17:15

Everything you need

An intelligent application that adapts to your environment

Automatic

Automatically switches between light and dark modes based on sunrise and sunset times.

Auto Detection

Automatically detects your location via IP geolocation for precise timings.

Manual Control

Force light or dark theme at any time via the system tray menu.

How does it work?

Three simple steps for a seamless experience

1

Installation

Download and launch the application. It automatically detects your location.

2

Local Calculation

Sunrise and sunset times are calculated locally with precision.

3

Enjoy!

The application automatically switches Windows theme at sunrise and sunset.

Engineered with care

Engineering designed for performance and scalability

Modular Architecture

Modular architecture enabling rapid updates and simplified maintenance while preserving native compiled program performance.

Native Performance

Compilation to native Windows executable for instant startup and minimal memory footprint, with no external dependencies.

Astronomical Precision

Solar calculations based on professional astronomical algorithms for sunrise and sunset times accurate to the minute.

System Integration

Direct access to Windows APIs via native library for instant and reliable system theme modification.

Privacy First

Geolocation only on first launch. All data stays local, no telemetry or tracking.

Open Source

Fully open source code under MIT license. Audit, modify and contribute freely to the project.

Ready to try?

Download AutoSwitchTheme for free and let your Windows theme follow the natural rhythm of the sun.

Windows 10/11
Internet connection (first time)
100% Free
Download for Windows Source Code

Version 2.1.0 • MIT License • Open Source