KOReaderSync

KOReaderSync gets your ebooks from your phone to your Kindle, wirelessly.

It transfers and synchronizes ebooks (and screensaver images) from your Android phone to a Kindle running KOReader, over Wi-Fi (SFTP). No cable, no cloud — everything stays on your local network.

KEY FEATURES
• Library sync: compares your phone's ebook folder with the Kindle's and uploads what's missing. Optional two-way mode (also downloads books that are only on the Kindle).
• Quick send: send individual files, or use "Share → KOReaderSync" from any app.
• Network scanner: finds your Kindle automatically (SSH port) — no need to hunt for the IP address.
• Custom screensavers: upload your own images to the Kindle's screensaver folder.
• Formats: EPUB, PDF, CBZ/CBR, MOBI, FB2, DjVu, TXT and more (handled by KOReader).
• Modern Material Design UI, light/dark theme.
• Multilingual: English, Italian, Spanish, French, German.
• Built-in guide.

HOW IT WORKS
On KOReader (on the Kindle) start the built-in SSH server (Menu → Tools → SSH Server) and connect to Wi-Fi. In the app, tap "Scan network" or enter the IP, then sync. Books are stored in /mnt/us/Books on the Kindle.

REQUIREMENTS
• A jailbroken Kindle running KOReader, with the SSH server enabled.
• Phone and Kindle on the same Wi-Fi network.
Note: this app does NOT jailbreak your Kindle and won't do it for you — you need a Kindle already set up with KOReader.

PRIVACY
No data collected. No ads, no tracking, no accounts. Your settings stay only on your phone; files go directly to your Kindle on the local network, never to external servers