NightOwl is described as 'Use this small, light-weight App to toggle macOS Mojave dark mode' and is an app. There are three alternatives to NightOwl for Mac, Windows, Linux and Mozilla Firefox. The best NightOwl alternative is Solace. It's not free, so if you're looking for a free alternative, you could try Nightfall or automaticDark - Time-Based Theme Changer.
Automatically changes Mac appearance using real-time weather, sunlight, and time data for light and dark modes, dynamic wallpapers, and color temperature, with on-device privacy, menu bar access, no subscriptions, and no analytics for seamless daily comfort.
This is a simple Firefox WebExtension that allows you to automatically switch between your themes based on the current time.
United Kingdom
