Sixteen pixel-art city nights, each looping every four minutes with its own weather and street sounds, over lofi that code writes while you listen. There are no recordings to run out of, and nothing to sign up for.

Paris is a painter’s attic: rain on the window, the Eiffel Tower sparkling beyond the zinc roofs, a cat asleep on the sill. San Francisco looks down a steep Russian Hill street as fog pours through the Golden Gate; Munich is a snowy Christmas market on Marienplatz. Each scene is a 480×270 animation that loops seamlessly every four minutes, and the city’s sounds are timed to the loop, so thunder rolls just after the lightning. Press W and any city gets rain, snow, falling leaves or a clear night, and the sounds and track titles follow: “first snow over shinjuku”.

The music is the real surprise. Nothing is sampled and no AI model is involved: each track starts from a random seed, one of about four billion, and a set of rules turns it into a key, tempo, chord progression, groove, song form and title. The default jazzhop voices its Rhodes chords to move as little as possible, drags the snare 8 to 18 ms behind the beat, and runs everything through a virtual tape machine with wow, flutter and a 7.2-second loop of vinyl crackle, four turns of a record at 33⅓ rpm. City bells and chimes are tuned to the key of the current track. Eight more styles run from felt piano and bossa nova to lofi house and a lute-and-recorder medieval, and the band thins to no drums or chords only.

“Follow the night” keeps you in whichever city is closest to 1 a.m., drifting west from Sydney to San Francisco as the hours pass. A mixer sets each city sound separately, so the rain can go up while the traffic goes off. There are focus timers (25/5 or 50/10), a sleep timer, and a floating mini player. Because the music is code rather than audio files, the site works offline once opened and installs as an app.

Two honest notes. The pixel art is AI-made: the maker, Safa Elmali, confirmed on Hacker News that the cities are generated with AI and then prepared into loops, and the site’s FAQ calls its video loops “AI-assisted”. Some commenters found the dithering loose and the Tokyo and Hong Kong signs not quite real characters. And every city has a billboard for rent, with a made-up local ad until a business takes it. The site itself is free; the silent video loops sell on Gumroad for $19 for all sixteen.