Fish Tank Plus

Fish Tank Plus is a free 3D aquarium that runs right in the browser on a phone, tablet or computer, nothing to install and no sign-up. It's meant to be left open as something calm to look at: a living reef with fish built from real photos, plus Octopus Boy, who hides in a little cave, crawls across the sand and changes colour. You earn Fish Sticks just by watching and feeding the fish, and spend them on new species and decorations, so everything unlocks for free. Tilt your phone or turn on the camera and the tank gets a real 3D depth effect, like peering into an actual aquarium. It has turned into a fairly popular little relaxation app. On Windows there's a separate version that installs as a proper Windows screensaver, spans multiple monitors as one big tank and has much heavier AAA-style graphics: https://windows.fishtankplus.com or the Microsoft Store at https://apps.microsoft.com/detail/xp8c5d95n4q26p . I'm a solo developer (Technology 83) and built it with a lot of help from AI tools, mainly Claude, ChatGPT and Grok.