Who can read a lyric. One page, no legal voice.
Last changed 13 October 2026. The full terms, privacy and refunds are here. Questions to support@produceros.app.
Who can read a lyric
The writers on the song. Nobody else.
A song is private to its owner and the co-writers who joined it by invitation. Every one of them signed in with an email, so every reader has a name on the sheet. There are no public pages, no search, and nothing on a song is reachable without being on it. The person who built SongwriterOS can see which songs exist and who is on them, and never reads a lyric unless you ask for help with that song.
What Spark sends, and to whom
Spark is private to the writer using it. What you ask it, and what it answers, is kept in your own thread on the song; no co-writer sees it, and nothing about it appears on the song or the split sheet. When you ask Spark about a line, talk to it about the song, or ask for a read, the lyric of that song and the line in question are sent to Anthropic, the company whose model answers, through its commercial API. Anthropic's commercial terms prohibit it from training its models on what customers send, and give the customer the rights in what comes back. That is a contract, not a guarantee we can audit; we are stating what the terms say. Anthropic keeps commercial API inputs for a limited period for abuse monitoring; we are confirming the exact period and will state it here. Nothing is sent anywhere until you ask. Every ask and every sketch you place is written to your own Spark log on the song, which only you can read and export, so your human authorship is on the record if it is ever questioned.
Rhymes and the thesaurus send the single word you looked up to Datamuse. Nothing else leaves the room.
What we keep, and where
- Lyrics, sections, chords, notes, held words, earlier versions and split sheets: stored with Upstash, a hosted database, in the United States.
- Voice memos: stored as audio files with Vercel. A memo's link is long and unguessable, but anyone holding the link can play it; share memos only with people on the song.
- Your email, your writer name, and your PRO and IPI if you add them.
- A copy of your songs on each device you use, so the room works offline.
Deleted songs sit in Recently deleted for 30 days, then go. Earlier versions are kept so a bad moment can be undone. We keep no analytics that follow you anywhere else, and we send no email except sign-in links and the sheet on an evening you co-wrote.
Taking it with you
Everything is yours to leave with, any time: the lyric sheet prints or copies as plain text, the split sheet exports, the registration pack is one click, the Spark log exports, and a full backup of every song and memo downloads from the account sheet as a file you can open anywhere. To delete your account and everything in it, email support@produceros.app from the account's address; it is done within 14 days and you are told when.
Keeping the room safe
Every documented leak of unreleased music we could find traces to a person's own account or phone being taken over, not to a service losing data. Three things help here: sign-in is by a link to your email, so there is no password to reuse; a co-writer only gets in by being invited to that song; and if someone should no longer be on a song, tell us and we remove them.