Owl Astro plans a night under your actual horizon

Field notes

Planning inputs include site-specific obstructions, equipment, moon conditions, and forecast clouds, rather than a generic view of the sky. The homepage says horizons can be imported from Stellarium or N.I.N.A., and lists catalogs ranging from Messier and Caldwell to Sharpless, Barnard, and Arp. It also says the app works offline, a practical detail for use at an observing site.