Based on our record, Api.ai seems to be more popular. It has been mentiond 1 time since March 2021. We are tracking product recommendations and mentions on various public social media platforms and blogs. They can help you identify which product is more popular and what people think of it.
Also, when I try to find more help in the AutoVoice documentation/help menu under the Advanced Commands section it points me to an outdated dead end: a now "private" YouTube video and the URL https://api.ai which is a dead URL. Source: over 2 years ago
Dialogflow - Conversational UX Platform. (ex API.ai)
Reality Editor - MIT's new app lets you program any object
Botpress - Open-source platform for developers to build high-quality digital assistants
Stringify - Smart Automation Home, Work, Life, IoT
Messenger Platform - Discovery, chat extensions, and richer experiences
My Devices - Drag and drop IoT project builder for Raspberry Pi