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Widgets are possible to do with Flutter, but you have to implement them natively and do a bunch of FFI for passing data. I went cross-platform from the start because I have only so much time, and it's much easier to write 95% of the code once instead of twice.

Here's a low-tech approach: an SMS/WhatsApp/Telegram bot. You can just text it the info and even the location. This means all the logic is server-side and nothing on the client.

I don’t think PWA can do widgets indeed, but they can have an icon on the iOS home screen.

you can tap the Share button and use Add to Home Screen on any website in iOS Safari, including PWAs. it even works on hn