Alternatives to Möbius Sync
Third-party iOS app that brings Syncthing file synchronization to iPhone and iPad. The listings below can replace it for an important use case. Each note says what changes if you switch.
The original
Möbius Sync
Third-party iOS app that brings Syncthing file synchronization to iPhone and iPad.
Replacements
Listings that take over the same core job as Möbius Sync.
Resilio Sync
Peer-to-peer file sync with no cloud server in the middle.
Resilio Sync also syncs directly between devices without a cloud server and has an iOS app, but it uses its own closed-source protocol instead of Syncthing.
Nextcloud
A file sync and collaboration server you run yourself, with desktop and mobile clients that behave like Dropbox.
Nextcloud replaces peer-to-peer sync with a server you run yourself, with an iOS client plus calendar and contacts, but you maintain updates and backups.
Seafile
Self-hosted file sync and share with optional client-side encryption.
Seafile uses a self-hosted server with block-level sync and optional per-library encryption and has an iOS client, but some features need the paid edition.
Synology Drive
A file sync and sharing package for Synology NAS devices, with desktop and mobile clients.
Synology Drive syncs iPhone and desktop files through your own Synology NAS rather than peer to peer, but it requires Synology hardware and is closed source.
Syncthing
Keeps folders identical across your own machines, directly between them, with no cloud account in the middle.
Syncthing is the upstream open-source project that Möbius Sync builds on, running on Windows, macOS, Linux and BSD rather than on iPhone or iPad.
GoodSync
Block-level file sync and backup with versioning and many back ends.
GoodSync runs on iOS and desktops with block-level sync and versioning across many back ends, but it requires a paid per-user licence and is closed source.
Similar software
Related functionality, not a direct replacement.
Syncthing Tray
Tray application and desktop integration for monitoring and controlling Syncthing.
LocalSend
Sends files between nearby devices over your own network, with no account, server or internet connection.
PhotoSync
A mobile app that transfers and backs up photos and videos between phones, computers, NAS devices and clouds.
FolderSync
A folder sync app for Android and desktop that works with over 20 cloud providers.
iCloud Drive
Apple's cloud storage, integrated across macOS, iOS and Windows.