Real-time astrophotography stacking for curious stargazers.
Because waiting until dawn to see your final stack is so 2010.

Astro Live Stacker (ALS) aligns and stacks your deep-sky images live, as they come from your camera.
It’s designed for astronomers who love both the night sky and open-source software — from casual backyard observers to serious astrophotography addicts.

ALS runs on Linux, Windows, macOS, and even the Raspberry Pi.
All you need is your camera, a clear sky, and a sense of wonder.

• Multi-platform support (PCs and small boards alike)
• Hot pixel removal
• Automatic debayer
• Automatic dark calibration
• Real-time image alignment and stacking
• Live histogram
• Auto-stretch, levels and color balance
• Integrated web viewer for remote session sharing
• Open-source and community-driven spirit ✨

Full installation, configuration, and usage guides live on the official site:
👉 ALS Documentation

It’s got screenshots, walkthroughs, and far fewer acronyms than you’d expect.

Ready-to-run builds for all major platforms are available here:
➡️ GitHub Releases

Each release includes binaries and changelogs.

Found a bug, have an issue or a bright idea, or want to help stack some photons?

• Open an issue on GitHub
• Come talk with us on Discord

Pull requests are very welcome — especially if they come with coffee ☕.

Originally built by the historical ALS Team,
now proudly maintained by Frédéric Cornu — chief bug-whisperer and eternal stargazer.

ALS continues to live on thanks to everyone who reports bugs, tests builds, and shares their sky.

Licensed under GPL-3.0.
Free as in freedom — and photons.

“Look up at the stars — and keep stacking.” ✨