It is indeed! Web app will primarily save NIP-52 as gift wraps to ensure privacy but those same features will eventually make it to mobile as well.
Discussion
Sweet! Is it on GitHub? Nice to see it get some privacy features, I know this wasn’t part of the original NIP
The main site's repo is https://github.com/patrickulrich/nostrcal and the android version is https://github.com/patrickulrich/nostrcal-android. It's still the same NIP-52 events, even for private events, they're just being wrapped via NIP-59 gift wraps.
The project originated as a calendar booking service, like Calendly, and by necessity morphed into a wider calendar project. Since it's original method was around booking I handle the gift wraps very similar to NIP-17 DM messages. I've also used kind 31926 and 31927 to address availability. 31926 let's you set your availability template for calendar booking while 31927 is to allow you to publish a "busy" time. This is primarily intended to serve as ways of blocking time against gift wrapped 31923s but can be used just to indicate busy blocks. https://github.com/patrickulrich/nips/blob/master/52.md