Is there a TangoHive app for iPhone and Android?

Yes. TangoHive has a native app for iPhone and iPad on the App Store and for Android on Google Play. Both are free to download.

The app does the whole calendar side of TangoHive: create and share calendars, subscribe to a feed (Google, Apple, or any ICS/webcal link) that stays in sync, import a schedule from a link, paste anything and let AI turn it into events, search across your calendars, Fix a whole calendar with AI, and edit repeating events. It uses your phone's own share sheet, so sending a calendar by Messages or WhatsApp is one tap.

The website does everything the app does and more (your group's public page, posts, and contacts live on the web). You can use either, or both with the same account: sign in on the app with the same email.

Nobody needs the app to see a shared calendar: anyone can open and subscribe to a share link in their phone's browser with no app and no account.