Open the Mac App Store to buy and download apps.
Starry Landscape Stacker makes it possible to produce landscape photographs taken at night that have both low noise and stars rendered as points. It does this by compositing several images taken in rapid succession, shifting the sky as needed to align the stars. A free trial version is available on the developer's website.
The steps needed to make the mask for the sky should go more quickly now. Placement of the red dots in the sky is faster and better. Finding the mask is now faster and better. There are slightly different controls for placing red dots and finding the mask.
The composition algorithms have been changed. There is an option to control the trade-off between star duplication and noise at the boundary between sky and ground.
Alignment is faster, typically by about 20%. The alignment results are better when there are few visible stars or a lot of noise.
Variable zoom levels are now supported.
Other fixes and improvements.
Full details here: https://sites.google.com/site/starrylandscapestacker/new-in-version-1-7
Up to six family members will be able to use this app with Family Sharing enabled.