Soulver is my favorite calendar/sheet-based notebook I've ever used. I highly recommend it, except for the CloudKit / iCloud Sync feature, which results in data loss quite often. Don't use that.

January 1, 2026: I ended up abandoning Soulver due to the unreliable cloud sync features. After testing a TestFlight version and various “improved” sync experiences, I could not meaningfully depend on it to keep my data in tact across devices.