App: Starry Sky Stacker
Developer: Ralph Hill
Genres: Photo & Video, Graphics & Design

Starry Sky Stacker reduces noise in pictures of the night sky that are captured as a sequence of exposures taken with a modern dSLR or mirrorless camera using an equatorial mount. Starry Sky Stacker aligns the images to compensate for errors in tracking, assigns a quality estimate to each image, allows the user to select images based on the quality estimate, and composites the remaining images. The resulting image has much less noise than any of the original images. Neither alt-azimuth mounts nor cameras that generate FITS files are supported. A free trial version is available at the developer's website.

Release notes:
Improved alignment with images that are very noisy.

EXIF data is no longer required in the image files but is highly recommended. If there is no EXIF data several parameters describing the camera have to be guessed. Sometimes the guess is wrong resulting in poor performance.

Fixed a problem that could occur when there are mutually contradictory metadata values in the EXIF data.

The minimum supported OS version is now macOS 10.14.6. It was macOS 10.11. The Apple development tools no longer support OS versions before 10.13 and recommend 10.14.6.