Plask

Plask ("splash" in Swedish) turns Apple Watch into a tiny pixel-art aquarium. Rubber ducks paddle across your wrist while you bathe or swim — and because the watch's depth sensor is real, so is their reaction: you dive, the ducks dive, with live depth, max depth and water temperature along the bottom. The scenes react to temperature too: cold water ices over, hot baths steam. On depth-gauge watches (Apple Watch Ultra, Series 10 and later) Plask can even launch itself the moment your wrist goes underwater. Animations run on any watch with watchOS 10 or later, and a built-in demo mode drives the water with the Digital Crown — no bathtub required. Kungliga Badverket, a fictional Royal Swedish Bath Authority, issues 42 pixel-art certificates for your bathing career: first splash, dawn dips, swims below five degrees, and stranger things. Earn enough and your duck gets a hat. Free with the classic yellow ducks. A single $1.99 purchase (no subscription, no account, no tracking — the app collects nothing) unlocks nine more scenes: sharks, jellyfish, octopi, aliens, Loch Ness, castaway, aquarium, bioluminescence, and surströmming — Sweden's most feared delicacy. Built solo in Gothenburg, Sweden.