Trackhop
Cards: “how compatible are we?” and the playlist poster
Two tools in the Tools tab that end in an image to share, in the story format (1080×1920) or the square one (1080×1080). Nothing is created or changed on any service: they only read.
How compatible are we?
Two playlists in, a score out. Each side can be:
- a public link pasted in (Spotify, Apple Music, YouTube/YouTube Music, Deezer, TIDAL, and SoundCloud in the GitHub/F-Droid build; short share links too), or
- one of your own playlists on a connected service, liked songs included.
Sharing two playlist links at once to Trackhop (select both messages in a chat, or paste two links in one share) opens the comparison directly.
The two lists are matched the way a sync matches them: an identical ISRC is the same recording, otherwise title, artist and duration are compared, so “Master Of Puppets (Remastered)” on one side counts as “Master of Puppets” on the other.
The score, 0 to 100, is:
- 70% of it: the share of the smaller playlist that is also in the other one;
- 30% of it: the share of the smaller side’s artists that appear on the other side.
The smaller side is the base on purpose: a 20-track playlist entirely contained in a 1,000-track one scores 100, not 2. The result screen also lists the tracks in common, the shared artists, and “for you” suggestions: the other side’s tracks by artists you both listen to that you do not have.
The card shows the score, both names, up to five common tracks with their covers and the shared artists. Covers come from the services or, when a track has none, from Deezer’s public catalogue (by ISRC, or by an exact enough title and artist); a track without a cover gets a coloured tile.
Which links work without logging in
| Service | Public link readable without an account? |
|---|---|
| Deezer | Yes |
| Apple Music | Catalogue playlists (pl.…) yes, when the build has an Apple developer token; a user’s library playlist needs Apple Music connected |
| Spotify, TIDAL, YouTube | No: their APIs need a token. Connect the service once; a public link of any other user then works |
| Amazon Music, Navidrome, Jellyfin, Plex | Own playlists only, from the connected account |
Playlist poster
Pick a playlist (yours, or a public link) and get a card with the cover (or a 2×2 mosaic of the first tracks’ covers), the title, the owner and service, the track count and total duration, and a QR code that opens the playlist on its service:
- Spotify, Apple Music, YouTube Music, Deezer, TIDAL, Amazon Music: the playlist’s public page. Scanning it opens the service’s app when installed. A private playlist opens only for its owner.
- Jellyfin: the playlist’s page on your server; Navidrome/Subsonic and Plex: your server’s address. Only reachable by people on the same network, or through your reverse proxy.
The QR code is generated on the phone (byte mode, error correction level M, up to 213 bytes), so nothing is sent anywhere to make it. Services with no public page get a poster without a QR.
The mosaic takes four tracks from four different albums, so a playlist that opens with several songs of one record does not show the same cover four times.
A cover drawn by your AI
Tick Cover drawn by your AI to have the AI you set up for the Playlist generator draw the art instead: OpenAI (gpt-image-1, or DALL·E 3 when the key has no access to it), Google Gemini (gemini-2.5-flash-image) or an OpenAI-compatible server for which you entered an image model. Claude, Groq and OpenRouter do not make images here, and the option says so.
It runs on your own key, so it may cost a few cents per picture. Only the playlist’s title, its five most frequent artists and its description are sent, with a request for square cover art without lettering, logos or real people’s faces. The picture is kept for the session: Make the card again does not pay twice, Another cover asks for a new one, Save cover keeps it as a PNG.
Sharing and saving
Share opens the system share sheet with the PNG; Save image asks where to put the file. Cards carry a small “Trackhop · trackhop.org” line at the bottom: that is how people who see one find the app.