Karel Bourgois
Karel Bourgois reviewedSmartly.AIAI voice platform for Google Assistant & Amazon Alexa
 RecommendedPros: 

Great platform to develop Vocal bots. Unique visual designer solution with code integration that make it easy for devs AND marketing people

Cons: 

Tough for them to keep with the evolutions of all the platforms

We are using it internally to build our vocal bot and they are very responsive to feedbacks and requests. Great team!

We are even looking at integrating their designer with our own APIs :)

Karel Bourgois has used this product for one year.
Niraj Kumar
Niraj Kumar@scoopearth · I am a Blogger
ManyChat is well organized and powerful with the loaded feature. It's easy to use. We in https://www.scoopearth.com trying to utilize it. working on this chatbot tool