Stellody
Stellar and melody, run together.
Stellody plays the collection already on your computer, then works out what is not in it: albums by your artists that you never picked up, plus artists you have never heard who sit close to the ones you love.
All of it read off your own shelves rather than a taste profile built by somebody else. It is free, there is nothing to sign up for and it never changes a single one of your files.
Click a cover to open the album underneath it. The rest of your collection stays exactly where it was.
Tick the genres worth looking in. Stellody reads the artists on your shelves, asks two public music catalogues what else they released and shows you the records you do not hold, along with artists close to the ones you do.
Your own collection asks the question, so the answer is not somebody else's idea of what you should like. There is no profile, no listening history and no account.
The search runs on your computer and costs nothing: no sign-up, no key and no limit on how often you ask.
MusicBrainz for what an artist released; ListenBrainz for which artists resemble another. What goes out is artist names from the genres you ticked, plus a few of your titles where a name is shared or a series is followed. Never your files; nothing about you.
Leave the years empty for everything; else ask for music from after a year, before one or between two. Your whole collection still teaches the search; the years only limit what it offers back.
Names the catalogue could not answer, holds nobody under or cannot tell apart are counted. A red count on the button beside discovery opens them, so a partial answer never reads as a complete one.
Tick albums and choose one of eight shops, a list you can edit: your browser opens that shop's own search for each. Copy puts them on the clipboard instead. No affiliation, no referral and nothing taken from a sale.
Pressing Find on a new selection offers to keep its genres, Include boxes and years as a named taste profile. The Taste profiles button puts any of them back in one choice; both genre filters share the same list.
What one search found, a page at a time. Blue is an artist or a series you hold; amber is an artist you do not.
A collection gathered over years is never tidy. Stellody shows one album wherever there ought to be one, which is also what makes the missing records question answerable: a box set counted as four records looks like three gaps that are not there.
Another player once quietly rewrote the titles, artists and album names inside a real collection, damaging 33 albums.
Stellody opens your files to read them, never to change them. Where it finds something wrong it tells you and leaves the file as it was.
No account, no profile and no record of what you listen to. Your music plays with the internet switched off. Five small things reach out at all, each only when you ask or to check for a new version; all five are written out in full.
FLAC, MP3, Ogg, Opus, WAV, AIFF, M4A, WMA, WavPack and AAC are read. Monkey's Audio, Musepack, DSD, TAK, TrueAudio, CAF and M4B audiobooks are not, so check before you download. Such a file is named in the health report, as is one whose details cannot be read.
A setup program on Windows, a signed disk image on macOS and a Flatpak on Linux. By default the sound goes through the system mixer, which converts it, so it is not bit perfect. Exclusive output bypasses the mixer on Windows and macOS; Linux does not offer it.
No price, no adverts and no subscription. One donate button sits at the left end of the bottom strip, ruled off from the controls beside it; its tooltip offers to buy the author a drink.
Stellody is written by one person, so that button is how the work gets paid for. There is no dialog, no reminder and no nagging; nothing changes if you never press it. Pressing it hands an address to your web browser.
Stellody does not stream, does not copy your CDs, does not sync to your phone and will not tidy up your files by rewriting them. It plays what you already have.
There is no paid tier, no licence key and no feature held back behind a donation. If Stellody has replaced something you were paying for, a donation supports its maintenance and continued development.