Cartridge — Music Player
Music Player for your NAS
Only for iPhone
Free
iPhone
DS Audio alternative, supports Synology Audio Station, CarPlay or AirPlay 2. Gapless playback, offline downloads, high-res audio support. Fast, private, ad-free
Cartridge is a beautiful, modern music player for your Synology NAS. Stream your entire music library over Wi-Fi, DDNS, or QuickConnect — from home or anywhere in the world — with the speed and polish of a native iOS app.
Cartridge connects directly to your Synology DiskStation running the Audio Station package. There are no subscriptions, no ads, no accounts, and no data collection. Your music stays on your NAS. Your listening history stays on your iPhone.
*** KEY FEATURES ***
STREAM YOUR LIBRARY
- Browse and play your entire Synology music collection. Home, Artists, Albums, Genres, Composers, Folders, and Search.
GAPLESS PLAYBACK
- Seamless transitions between tracks — essential for live albums, classical works, DJ mixes, and concept albums.
OFFLINE DOWNLOADS
- Save songs, albums, and playlists to your iPhone for listening on the go. Wi-Fi-only by default to protect your data plan.
AIRPLAY 2
- Cast to HomePod, Apple TV, or any AirPlay receiver. Full lock-screen metadata handoff, full-screen receiver UI, and Spatial Audio support on AirPods and multichannel on your Apple TV
CARPLAY
- Drive with your own music. Dedicated CarPlay interface with Home, Playlists, and Library tabs — recently played, pinned favourites, top artists, smart playlists, and full album / artist drill-downs. Now Playing with heart, shuffle, repeat, and jump-to-album / jump-to-artist. Ask Siri to play your music, hands-free.
SIRI VOICE CONTROL
- Ask Siri to play your library by album, song, or artist. On iPhone, end the request with "on Cartridge" — for example, "Hey Siri, play Nevermind by Nirvana on Cartridge". In CarPlay, just say the album, song, or artist.
AUDIOPHILE-GRADE PLAYBACK
- Native support for FLAC, ALAC, AAC, MP3, AIFF, and WAV — including high-resolution PCM up to 192 kHz.
DSD SUPPORT
- Play DSD64 stereo and multichannel files (.dsf / .dff) directly from your NAS using a custom software decoder.
ARTIST IMAGES FROM APPLE MUSIC
- Artist pages feature full-width photos from the Apple Music catalog. Album artwork is also fetched from Apple Music when your NAS doesn't have cover art embedded.
SMART HOME SCREEN
- Recently played, recently added, liked songs, top artists, and pinned favorites — all on a single scrollable page.
PLAYLISTS
- Create, edit, and sync playlists stored on your NAS. Or build local iPhone-only playlists for offline use.
INTERNET RADIO
- Add and play Shoutcast, Icecast, and HLS streams alongside your NAS music.
FULL-SCREEN NOW PLAYING
- Animated album art, gradient background colors that shift with each song, swipeable queue, and one-tap navigation to artist or album.
LOCK SCREEN CONTROLS
- Standard iOS media controls with full metadata handoff and background playback.
*** PRIVACY BY DESIGN ***
Cartridge does not collect, transmit, or share any personal data with the developer or any third party. There is no developer backend — the app talks directly to your NAS. Your credentials are stored in the iOS Keychain, and your listening history lives only on your device. No analytics, no tracking, no SDKs, no ads.
*** REQUIREMENTS ***
- A Synology NAS running DSM 6 or DSM 7
- The Audio Station package installed on your NAS with your music library indexed
- Network access from your iPhone to your NAS (Wi-Fi, Local LAN, DDNS, or Synology QuickConnect)
*** ABOUT ***
Cartridge is an independent, unofficial third-party app. It is not affiliated with, endorsed by, or sponsored by Synology Inc. "Synology", "DiskStation", and "Audio Station" are trademarks of Synology Inc., referenced only to describe compatibility.
Support: https://mbjprod-netizen.github.io/cartridge-app/support.html
Privacy: https://mbjprod-netizen.github.io/cartridge-app/privacy.html
Ratings & Reviews
- This app hasn’t received enough ratings or reviews to display an overview.
New: More expressive Album view, tappable Genres and Casting (Beta) — play your library on UPnP amplifiers, receivers and network speakers streamed straight from your NAS at full quality.
CAST TO YOUR SPEAKERS (BETA)
- Send playback to Sonos and other UPnP network speakers on your Wi-Fi — long press the output button in Now Playing, or the cast button on Home screen.
- Your speaker plays directly from your NAS at full fidelity, and hi-res and DSD are handled for you — your phone is just the remote.
- Full control from the app: play and pause, next and previous, shuffle and repeat, volume, and a live queue with add-to-queue and play-next.
- iPhone Speaker is always one tap away to switch playback back.
LIBRARY & NOW PLAYING
- Richer artwork-matched colours across the album and Now Playing screens, and a clearer progress bar.
- Genres are now tappable everywhere — on the album screen and in the "…" menu on albums, songs, and Now Playing — to jump straight into a genre.
- Tap the album artwork while something's playing to open the full player.
AUDIO
- Improved metadata handling for Opus codec in Ogg containers
CARPLAY
- "Recently Added" now shows large album-art cards, and album track lists are cleaner and easier to scan at a glance.
- More reliable "Popular" on the artist screen.
FIXES & POLISH
- Performance, memory, and stability improvements throughout the app and in CarPlay.
Thank you for using Cartridge - music player!
Independent / unofficial app — not affiliated with Synology, Apple, or Spotify.
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The developer, Jeroen Smits, indicated that the app’s privacy practices may include handling of data as described below. For more information, see the developer’s privacy policy .
Data Not Collected
The developer does not collect any data from this app.
Accessibility
The developer has not yet indicated which accessibility features this app supports. Learn More
Information
- Seller
- Jeroen Smits
- Size
- 8.8 MB
- Category
- Music
- Compatibility
Requires iOS 17.5 or later.
- iPhone
Requires iOS 17.5 or later.
- iPhone
- Age Rating
4+
- 4+
- Copyright
- © 2026 MBJprod

