Does not work easily, or with CF7

This thing is terrible. Nothing is clear or intuitive. The simplest things are impossible, confirmed by tech support. We just wanted to add an email sign up to our many Contact Form 7 forms, and use the double opt-in required by GDPR. But no can do. Meant to have 300 free credits / day, but has zero, so won’t even send the test message. Wasted a lot of time on this.

It’s also narrowly commercially oriented. The creators don’t seem to be able to imagine that there are organisations which are not ‘companies’, and organisations that want to create email lists without calling it ‘marketing’.