What it does
Sequator is free software for tracking, aligning and stacking stars across multiple images, with 16-bit TIFF output for further editing.
Start with sharp short exposures, then align and stack the stars with sky masking or foreground treatment as needed. Sequator accepts RAW and 16-bit TIFF and produces 16-bit TIFF for later editing; auto-brightness and HDR output serve different exposure needs. Its download page lists Windows 10/11 64-bit, at least 8 GB RAM and a Visual C++ runtime. Unsupported camera RAW may need DNG or uncompressed TIFF conversion; the listed 1.6.2 r2 decoder excludes Nikon HE/HE*. The author's terms say non-commercial use, with an exception allowing personal studios to sell derivatives. Check that qualification for business work.
Strengths
- Star alignment and image stacking
- 16-bit TIFF output
Best for
- Combining short astrophotography exposures
Sources
- Sequator (Oct 26, 2026)
- Sequator input and composition controls (Oct 26, 2026)
- Sequator platform, RAW and use conditions (Oct 26, 2026)