Thank you for the kind words.

Syncing is a tricky one. The universal method seems to be using caldav, so Taskpony would need to support that as an endpoint. But I haven't investigate this as the android side of things is complicated - or at least, I found it so when trying exactly that. You need to install third party software (DavX5 is the most common) - which is listed as both free via fdroid and paid via GPlay. That provides the syncing which is then available to other things on the device. Not an unsolveable problem, but I found it fiddly, and kept being nagged to register software to get it working.

But I made an early decision not to replicate things that are done well elsewhere. Caldav has lots of options, the best I found is Radicale which provides unlimited tasklists and calendars, but has no interface. That does tie in well with Thunderbird on desktop and other things, but again, the syncing problem exists on Android. Vikunja and TaskTrove are good projects that do support caldav and multi-users if you do want to go that route.

I wanted Taskpony to be simple to set up. Run a docker compose command and visit a URL - that's it for LAN use. No reliance on other software apart from a web browser. I can't achieve that and provide syncing or multi users, sorry. Of course, you and your wife can just use the same instance of Taskpony and have different Lists for personal or shared tasks, then everything is always in sync.