It's not the same as what Mailgun does. Mailgun lets you send emails programmatically. Sendy/Sendwithses lets you send campaigns from an interface (using your SES).

I changed at the time to Mailgun and I am happy there, so not looking into other options for now.

But at the time I look at those and preferred a solution with less upfront configuration required and less things to manage in general. It was a side-project that required a very quick solution. Mailgun was perfect for this.