We help musicians compose more.
Not the AI.
ComposerDeck is built by a tiny independent crew of four working musicians, in France, Georgia, the US and Spain, with cards and takes contributed by the musicians who use it. It's the daily creative-constraint engine we wished existed: a deck of cards that gets you composing in 90 seconds, not generating in 9.
Challenge yourself · Inspire others.
ComposerDeck started as a personal fix for a familiar wall: open the DAW, stare at the empty session, scroll, close the DAW. Mark, a sound engineer and composer, kept losing sessions to the blank page.
He talked it through with his friend Lester, a French producer and orchestral musician. Inspired by Brian Eno's Oblique Strategies and classic constraint-based composition exercises, the fix became a deck of cards. Pick one chord, one mode, one instrument, one rule you can't break. Set a timer. Compose.
It worked well enough that it deserved to exist properly, so Lester asked Jeff to build it: as an app, in the open, shared with anyone who fights the same wall. The first public version shipped in June 2025 and it has been evolving ever since.
Six principles we won't compromise on.
Constraints, not options.
A blank canvas is the enemy. Three random cards is the friend. Pick a chord, accept the brief, ship the sketch.
You compose, not the AI.
We will never generate music for you. AI music tools are not our competitors: they're our anti-mission. The hand that writes is yours.
Daily over perfect.
90 minutes a day for 30 days beats one 45-hour weekend. We optimize for streaks, not masterpieces.
Free forever for the core.
Daily draws, profile, submissions, blog: free. Always. Pro funds the work and unlocks the depth, but the daily practice is non-negotiably free.
Curated, not generated.
Every card is hand-written by a working musician, many proposed by the community and reviewed one by one. No prompts, no AI fluff.
Tool-agnostic.
Logic, Ableton, FL, Bitwig, Reaper, paper, voice memos: we don't care what you compose with. We just hand you the brief.
A tiny crew. And all of you.
Small by choice. We compose, we ship, we read every message.
Producer and musician, with an orchestral bent. Writes the cards, edits the journal, and reads every message.
Sound engineer, composer and multi-instrumentalist at MarkH Audio. Puts every release through its paces in real sessions and contributes cards to the deck.
Musicians propose new cards, build and share public decks, and ship real tracks to the feed. Every contribution is reviewed by hand before it joins the deck.
Big numbers where it matters.
A young, growing community whose work is live for everyone: the feed, the deck library, the leaderboard. And underneath it, the foundations we're proud of:
Want to compose with us?
Pull your first cards. The daily streak starts the moment you draw.