I created this app to help me track cash transactions that I can then export as a CSV file and then import into my PTA. It works well. It can work offline. I built it to be progressively enhanced. So, no JS needed but, if you don't mind JS being used, then it will have better features and even work offline, saving any transactions for when you are online again.

https://github.com/jon49/cash

I created a little app that tracks the cash spending that I can export with a CSV file. You can host it yourself. I had no idea that my wife was using so much cash!

https://github.com/jon49/cash

I took that idea and made it actually usable.

https://github.com/jon49/htmz-be

It's amazing how much further you can go when you flip the server as the one deciding where what should be updated on the page.

This was originally conceived by datastar and nomini also implements it this way. And HTMX 4.0 will have this as a first class citizen.

HTMX and related libs work just fine as offline apps. I've been doing it with my personal apps I make for myself for a long time.

Also, morphdom/idiomorph get you a long way even when you have highly interactive pages, especially if you have to hit the back end anyways. If you don't need to hit the back end then a front end lib is fine. But even then, the simpler pattern of hypermedia-driven applications can be better.

See https://github.com/jon49/Soccer as an example of this.

There's also htmz-be, nomini.js. Depending on your complexity needs.