I've never used Sendgrid but with Courier you send 10,000 free messages per month so you can try before you buy. "Launch new channels in minutes Courier suppor

I've never used Sendgrid but with Courier you send 10,000 free messages per month so you can try before you buy. "Launch new channels in minutes Courier supports email, SMS, push, in-app, and multiple chat channels in a single API. Start supporting a new channel with the click of a button—no need to write more code."