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music, made in the browserTap squares or write code. Same track, either way. We built a music maker that gives you sound in about thirty seconds and never eats your track.
blupit.app · the sequencer, playingphone · the same trackthe videos are the app itself
Summary
blüp makes music in the browser. Open the page, press Play, and a loop is going in about thirty seconds. Tap squares or write code: same track, either way. We built it on Strudel in two days in September 2026, gave it about 2,000 sounds, and made it free.
Strudel brings TidalCycles to the web: a whole track from text, in a browser tab, nothing installed. The first thing it shows most people is an empty code editor, and most people close it.
Step sequencers are the friendly way in, but they own the pattern. The grid can only show the rows it knows about, and when it rewrites the file it will quietly delete the eleven parts it cannot see.
We wanted both ways in, in one tool, for people who have never written music code and people who have.
Edit the code by hand and your edit drives playback until you touch the grid again. When an edit comes back to the grid it is spliced into the part it came from, or refused by name with the reason on screen. Never approximated. That rule replaced an earlier one that rebuilt the file, after a whole day of bugs.
A control changes the code or says why it cannot. A test drives a real Chrome over all 96 controls before anything ships.
The layer panel reads a track by evaluating it through Strudel, never by running regex over the text. What you see is what plays.
When the grid does take over, the old code and grid are both kept, and one button restores them byte for byte. The public line: it never eats your track.
Pick one of eight genres and a whole loop plays: tempo, key, drums, bass and chords. No account to play, build or export. A free one adds Save, sharing and three AI edits per track.
Logo on near black #0c0d10Tap squares. Or write code.
The mark: three bars of a sequencer, mid-loop.
Near black so the lit squares are the brightest thing on screen, violet for what plays, mint for what answers. The whole interface is set in JetBrains Mono, because in blüp the grid and the code are the same thing. The name settled on September 25, 2026: blüp, at blupit.app.
Every control sits on the same dark surface in the same monospace: transport, genres, lanes, presets, the code toolbar. Every piece here is rebuilt in code from the real screens: live, resizable, nothing invented.app.
Tokenscolor
TypeJetBrains Mono
Buttonstransport · calls
Toolsside panel
Steps and lanes16 a bar
Inputstempo · key · scale
Chipspresets · toolbar
Codethe same track
setcpm(105/4) // MACHINE RHYTHM kick: s("bd bd ~ bd bd") .gain(.85) clap: s("~ ~ cp ~ ~") .gain(.35) hats: s("hh ~ hh hh ~") .gain(.10) // INDUSTRIAL SYNTH PULSE ~ WAY DOWN pulse: note("d2 d2 ~ d2 d2") .s("square") .lpf(600)
ModalAsk AI
Cardscommunity loops
Noticethe code is driving
The grid, the code and a sentence to the AI all drive the same loop. Save it with a free account, post it to the community, or export it and leave. Every screen below is blupit.app as it runs today.
Profiles, the community feed, moderation and the help page shipped on September 25, 2026, the second day. Save with a free account, share the link, or post it to the community page. Anything you hear can be opened and remixed.
blupit.app/community · desktop and phone
No account to play, build or export. Work is kept in the browser as you go. Fav keeps a loop on this device, Save gives it a web address, Export gives you a WAV, a MIDI file or the code. The whole manual fits on one page.
blupit.app/help
The music blüp makes is Strudel, and the engine that plays it is @strudel/web, free software from Felix Roos and the TidalCycles family, loaded unmodified and credited on every page. Strudel exposes no master bus, so we patched a limiter into the audio graph.
Dirt-Samples, 71 drum machines from tidal-drum-machines, 128 General MIDI instruments, VCSL, piano and mridangam. The load order is fixed so a saved track never changes sound.
Recorded as the loop plays, with the limiter on so loud loops do not clip. MIDI and the Strudel code export too, so a track can leave for any DAW or for strudel.cc. Tempo is read from the running code. Laravel 13, on a RunCloud server we run.
Play, build and export without an account; a free account adds Save, sharing, the community page and three AI edits per track. Known limits, documented in the open: one chord lane with four slots, pitched rolls snap to eight rungs, and no audio or vocal upload yet.
Counts from blupit.app/about, /help and /credits and the blüp repository, October 2026.