Sundrop is a private iPhone photo app for parents. It finds the best family photos in a camera roll and turns them into slideshows, stickers and collections, with weekly recaps every Sunday, growth time-lapses and side-by-side comparisons of siblings at the same age. Every photo is analyzed on the device and never uploaded to Sundrop's servers or used to train shared AI models; optional spouse sync runs through iCloud. Sundrop is made by a team of dads from the makers of Matter, led by founder Ben Springwater, and publicly launched in October 2026.