Servers

Enve speaks to a lot of backends. You can connect to as many as you want, mix them in one library, or filter to one source. Here's what each one supports today.

Audiobookshelf

The most complete integration. Full library browsing, progress sync, bookmarks, chapters, and downloads. Works against any modern ABS install with API token auth or username and password.

What works: audiobook and podcast libraries, server-side progress sync, bookmarks (Enve to ABS, both ways), cover art, chapter data, collections, downloads.

App availability: iOS Book Player, Android.

Project: audiobookshelf.org · GitHub

Plex

Enve was originally built to make Plex audiobooks bearable. Today it covers audiobook libraries, music libraries (in the Music app), and video libraries (in the Video app).

What works: audiobook libraries (Book Player), music browsing and streaming (Music Player), movies, TV, and watch state (Video Player), Plex auth via the standard OAuth flow.

App availability: iOS Book Player, Music Player, Video Player.

Project: plex.tv

Komga

Full Komga API support, not just OPDS. Series, collections, read state, page positions.

What works: ebook and comic libraries, series, collections, read-state sync, full-resolution covers.

App availability: iOS Book Player, Android.

Project: komga.org · GitHub

Kavita

Kavita's native API for libraries, collections, and reading progress.

What works: ebook and comic libraries, series, collections, progress sync.

App availability: iOS Book Player, Android.

Project: kavitareader.com · GitHub

Jellyfin and Emby

Both servers share the same family of APIs and are handled with shared models.

What works: book libraries (Book Player and Android), music libraries (Music Player), video libraries (Video Player), playback progress, transcoding pipelines.

App availability: iOS Book Player, Android, Music Player, Video Player.

Projects: jellyfin.org · Jellyfin GitHub · emby.media

Grimmory

Grimmory (formerly known as Booklore) is a unified audiobook, ebook, and sync server. Enve uses it as both a content provider and a sync sink, including a KOReader bridge for ebook progress.

What works: audiobook and ebook libraries, native sync, KOReader sync bridge, smart caching.

App availability: iOS Book Player, Android.

Project: grimmory.org · GitHub

BookOrbit

BookOrbit is a self-hosted library and reading platform for audiobook and ebook collections. Enve connects directly to its libraries, plays audiobooks, opens ebooks, and syncs reading and listening progress.

What works: audiobook and ebook libraries, collections, audiobook and ebook progress, annotations, and BookOrbit shelf status.

App availability: iOS Book Player, Android.

Project: BookOrbit on GitHub

Silo

Silo is a self-hosted media server with book and video libraries. Enve connects to its native API instead of treating it as a generic folder or feed.

What works: audiobook and ebook libraries in the Book Player, movie and TV libraries in the Video Player, playback, progress sync, and ebook annotations.

App availability: iOS Book Player, Android Book Player, iOS Video Player.

OPDS

For everything that speaks OPDS: calibre-web, Komga's OPDS feed, Ubooquity, anything that publishes a standard feed.

What works: catalog browsing, downloads, basic search. No progress sync (the protocol doesn't support it).

App availability: iOS Book Player, Android.

Spec: opds.io

WebDAV

Point Enve at any WebDAV mount: Nextcloud, ownCloud, Synology, raw nginx, FastMail Files. Files become a library.

What works: folder browsing, downloads, playback. No native progress sync, but Enve handles progress locally and via iCloud.

App availability: iOS Book Player, Music Player, Video Player.

Spec: WebDAV (RFC 4918)

Premiumize and Real-Debrid

Stream straight from your debrid cloud. Useful when your library lives there before it ever hits a server.

What works: folder browsing, streaming, downloads. Real-Debrid is supported in the Book Player audiobook stack too.

App availability: Premiumize: iOS Book Player, Music Player, Video Player. Real-Debrid: iOS Book Player.

Projects: premiumize.me · real-debrid.com

Storyteller

Storyteller is a server that aligns ebook text with audiobook narration. Enve uses Storyteller data to power StoryAlign on iOS 26+ for word-level highlighting against real narration audio.

What works: Storyteller content as a source, alignment data feeding the reader.

App availability: iOS Book Player, Android.

Project: smoores.dev · GitLab

Subsonic (and friends)

Subsonic-compatible API. Works against Navidrome, Airsonic, Gonic, Astiga, Funkwhale, and anything else that speaks the protocol.

What works: music libraries, browsing, streaming, playlists.

App availability: iOS Music Player.

Projects: subsonic.org · Navidrome · Airsonic

Local files

No server required. Pick a folder. Enve scans recursively, extracts metadata, and builds the library.

Supported formats:

• Audio: M4A, M4B (ALAC), MP3, FLAC, AAC, AIFF, OGG, Opus, WAV, WebM
• Ebooks: EPUB (including Readium LCP), PDF, KF8 and AZW3 (converted on import)
• Comics: CBZ, CBR
• Not supported: DRM-protected Kindle, Adobe ADEPT (.acsm)

App availability: every app.

Sync sinks and companion projects

Not backends, but Enve plugs into all of these for reading-tracking and cross-device sync. Credit where it's due:

• KOReader: the open-source e-ink reader. Enve talks to its sync server via the KOSync protocol. GitHub.
• Hardcover: reading-tracking service. Used for metadata, reading goals, and progress sync.
• Readium: powers the EPUB reader on both iOS and Android, including Readium LCP. GitHub.
• MobileVLCKit: the VLC framework that backs the Video Player for codecs AVKit doesn't handle.

Compatibility matrix

Current provider support by app and platform. A checkmark means the provider can be added in that build; labels clarify the supported media type where useful.