Definitely not a dumb question, I was wondering that too. My first guess for cross-platform desktop apps these days is Electron, and Inkdrop's UI looks a little Electron-y. But it would be really interesting to hear if it's something else.
For the mobile apps, afaik React Native is the most capable cross-platform mobile framework right now. Again, would be really interesting if it's something else (or hardcore if they're both native apps).
For the mobile apps, afaik React Native is the most capable cross-platform mobile framework right now. Again, would be really interesting if it's something else (or hardcore if they're both native apps).