The best part about kerauno was their fast service response time for my questions I had when signing up with them! There were some things they didn't have at first like certain features but it's easy enough to get those from other companies if needed.
If you want an affordable way to communicate internally or externally this would be your go to option because there are no hidden fees unlike others out there who charge monthly subscriptions to use their services. Communicating within our organization using different channels such as phone calls, emails, texts etc so we could keep track of everything without having to rely solely on one source.