PhotoPills has an interesting application for your iPhones and tablets. According to the site…”No matter the type of photography you love: Landscape, Milky Way, Moon, Sunrise, Sunset, Architecture, Star Trails, Drone, Meteor Showers, Solar eclipse, Lunar Eclipse, Time lapse, Wedding, Portrait or Travel…PhotoPills is your photography planning app. It helps you PLAN your photos ahead of time… So you’re always at the right place at the right time to capture the best photo possible.”
In addition, the site offers a 122 page (PDF) guide to Milky Way Photography (2022) for free. It is well worth reading if you hant to try your hand at night photography.