Best Calibre Companion Alternatives (2026) — Compared
Calibre Companion is effectively abandoned and Android-only. If you need a Calibre Companion alternative in 2026, here are the options that actually show up in searches — named honestly, with where each wins. CaliMob is our pick when you want one app that syncs a real Calibre library and reads EPUB/PDF/comics/audiobooks on Android and iOS.
Quick comparison
| App | Platforms | Built-in reader | Best when… |
|---|---|---|---|
| 1. CaliMob | Android + iOS | Yes (ebooks, comics, audiobooks) | You want Companion-style Calibre access + reading in one place |
| 2. Calibre Sync | Android | Limited / pair with a reader | You mainly need active cloud-folder sync |
| 3. Moon+ Reader | Android | Excellent | Reading UX first; OPDS / local files OK |
| 4. ReadEra | Android | Excellent (many formats) | Local library, no Calibre metadata sync |
| 5. Librera | Android | Yes | FOSS-leaning local / OPDS reading |
| 6. KOReader | Android, e-ink, Linux | Yes (power-user) | E-ink devices and deep customization |
| 7. justRead | iOS | Yes | iPhone-only two-way Calibre sync focus |
1. CaliMob — best overall Companion replacement
Syncs Calibre libraries from Drive, OneDrive, Dropbox, WebDAV/Nextcloud, FTP/SFTP, OPDS, Content Server, and Wireless Device Connect/Share. Built-in reader; Android and iOS; free, no ads. Details: Calibre Companion alternative · CaliMob vs Calibre Companion.
2. Calibre Sync
Closest “Companion-shaped” sync tool still active on Android. Strong if you already have a preferred reader and only need the library bridge.
3. Moon+ Reader
Industry-standard Android reading UX; OPDS and local files. Not a Calibre metadata.db companion. CaliMob vs Moon+.
4. ReadEra
Broad format support, polished local reader. No native Calibre cloud/library sync. CaliMob vs ReadEra.
5. Librera
Capable Android reader with OPDS; good FOSS-adjacent choice when you do not need full Calibre folder sync.
6. KOReader
Power-user reader beloved on e-ink. OPDS yes; not positioned as a Calibre Companion replacement for phones that want cloud Calibre folders + comics/audiobooks in one UX.
7. justRead (iOS)
Strong iOS Calibre sync story. Prefer CaliMob if you also need Android, comics, audiobooks, or Wireless Device in the same product.
How to choose
- Need Companion + reader + iOS → CaliMob.
- Android sync only → Calibre Sync (+ your reader).
- Best reading chrome, local/OPDS → Moon+, ReadEra, Librera, or KOReader.
- iPhone sync specialist → justRead or CaliMob.