The Hub is a single file: download Hub.html and open it in Chrome, Edge or Safari. It keeps everything on your device and can sync your devices through this server, encrypted with a passphrase only you know.
Build: (unknown)
Already using the Hub? Replace your Hub.html with this one on every device, after a full backup (Config & Backup). The Hub tells you when a newer build is here.
On a phone or tablet, open the hosted Hub and add it to your home screen (Safari: Share › Add to Home Screen; Chrome: menu › Install): it opens in its own window and keeps working without a connection. The Hub app is also on the App Store and Google Play.
Privacy and Terms of use — what stays on your device and what leaves it.