Is there a TangoHive app for iPhone?

Yes. TangoHive has a native iPhone and iPad app on the App Store, and it is 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.

There is no Android app yet. On Android, open tangohive.com in your browser, and anyone can still open and subscribe to a shared calendar link with no app and no account.