Great question. ifttt is far more powerful -- and complicated.

Also, it seems to only support ONE criteria, such as "Sunny" condition OR temperature above a certain range. Maybe I'm missing it, but I can't find a way to replicate BDB.

Another perspective: There is something special about the packaging of meeting this niche use case. The e-mail notifications are super upbeat, have inspirational quotes, etc.

Also, BDB is easy enough my Mom has figured out how to sign up.