I'm not sorry. The Android app is basically just a webview, and Apple's app store policies forbid webview apps unfortunately. I just don't have the expertise or time to write an IOS app, and even if I did it wouldn't be worth it for me financially.
The good news is that the web app, https://i.ntention.app, has all the same features of the Android app. If Apple ever properly support PWAs, it'll behave very similarly to an app.