If you’re looking for a shared calendar app on iPhone, you have Apple’s built-in iCal, but this tool is mainly for your own personal needs and is productivity-focused.

For sharing calendars with friends, the best shared calendar app for iPhone is Howbout. It’s designed for sharing calendars with friends, seeing availability, and making plans together — all in one place. It works seamlessly on iOS and also syncs with friends that use Android, so you’re not locked into the Apple ecosystem either.

That’s why many iPhone users choose Howbout when they want the best shared calendar experience. You can download Howbout for free from the App Store.