Day & Night vs John’s Background Switcher

Day & Night has no write-up on Specifiction yet; its figures are above.

John’s Background Switcher changes a Windows or Mac desktop background on a schedule, using individual photos or assembled montages and collages. Its image sources include local photos and services such as Flickr, SmugMug, Unsplash, Pixabay, Dropbox, OneDrive, Vladstudio, Immich, and Media RSS feeds, though availability varies by platform. Windows also lists Pexels, Last.fm, and Wallhaven. On Mac, it can manage multiple monitors, showing the same or different images on each, or using a single monitor. Mac switching intervals range from every 10 seconds to 7 days, with grayscale, sepia, and desaturation effects. Windows support starts at Windows 10 and requires Microsoft.NET 4.8; the setup wizard can install that dependency. The maker says settings and authentication tokens are stored locally, photo services are contacted directly, and cached photo results are kept for no more than two days. Windows is free at free. Mac direct costs 7.99 USD once, and Mac App Store costs 8.99 USD once.