Calendly has been in the market since 2013, and has done a good job of disrupting their incumbents.
Calendly specializes in appointment scheduling for small teams and professionals. They offer simply scheduling for relatively simple use cases. Unlike Cogsworth which is more suited toward business uses and more involved, complex scheduling requirements.
Above we detail a comparison table of Calendly with Cogsworth features based on a November 2018 review kindly facilitated by our users.
This is why sites like Capterra, Getapp, Finances Online are driving so many people to seek and find alternatives to Calendly.