[gisborne]

If you really are doing this for yourself, Flutter has the best development efficiency and you can use animations and such pretty easily to make a slick product.

But no-one hires Flutter developers at least in the US and Canada. It’s pretty popular in India and China and some other parts, but you’ll struggle if you want to find work doing this, or if you try to hire someone to do it (although the latter wouldn’t be terrible, and you’d be hiring someone who’s choosing a tool for its virtues, not just its market share).

If those considerations bother you, then Electron or something lighter weight like Gluon or Electrino.

The other major alternative is React Native. You should look at that also.

But if this is really just you, Flutter, no contest. Desktop, mobile and even web (although it is not ideal for just a web app, but it would let you offer a web version with minimal extra affort, and it’s improving in this area rapidly).