If you're looking for a Vapi alternative, Voiceflow is a good option. It's a collaborative tool to design, launch and scale chat and voice AI agents. With data import, visual workflow builders and a wide range of integrations, Voiceflow is good for a range of use cases like customer service automation and in-app copilots.
Another good option is Retell AI, which specializes in human-sounding conversational Voice AI. It's got tools for creating complex workflows, deploying to multiple channels and analyzing what happens after a call. Retell AI supports multiple languages and voices and has a proprietary Turn-Taking model for more natural conversations.
If you want more control over your voice AI platforms, SoundHound has a variety of options for different industries. Its Houndify developer platform lets you build and deploy conversational assistants with customizable experiences and insights into what people are doing with them.
If you want a platform geared for speech interaction, Speech Studio has the basics like speech-to-text and text-to-speech, so it's a good foundation for things like customer service chatbots and voice assistants.