There are certain differences between Librevault and Syncthing now:

* Librevault is simpler for the end user. From my perspective, Syncthing doesn't aim to be user-friendly. More like geek-only solution.

* Librevault supports adding a folder by key, like BTSync. And also, it supports a URL scheme for adding a new folder just by clicking it in the browser: https://librevault.com/blog/lvlt-scheme/

* inotify, fsevents, kqueue and ReadDirectoryChangesW support out of the box. Syncthing requires you to install a separate third-party plugin for this.

* DHT support, so it doesn't need any trackers for peer discovery. DHT is Mainline DHT, so it can connect to BitTorrent clients and ask them for peers. It means, that Librevault can participate in the world's largest distributed peer discovery network and will not suffer the lack of DHT nodes.

Also, it has a proper (!) desktop UI inspired by BitTorrent Sync 1.3.