Synthflow vs Vapi vs Voiceflow

Synthflow AI is a no-code platform that empowers businesses to create and deploy sophisticated AI-powered voice assistants to automate phone calls. These assistants can handle both inbound and outbound calls, engaging in human-like conversations to perform a variety of tasks, thereby enhancing customer service and operational efficiency.

Synthflow AI offers extensive integration capabilities with popular CRM systems such as HubSpot and Freshworks, as well as other applications through tools like Zapier and Make.com. This allows for seamless data flow and workflow automation.

Vapi.ai offers a cutting‑edge voice-driven UI/UX and SDK for devs. Integration with platforms like iOS shortcuts or React via NPM has been attempted by some developers. Build, test, and deploy advanced voice AI agents in minutes with Vapi. The platform for developers creating conversational voice AI. 

It combines speech-to-text, large language models (LLMs), and text‑to‑speech, giving you full control over each component—such as choosing providers like OpenAI, Anthropic, Deepgram, ElevenLabs, and others. Vapi CEO Jordan Dearsley shares how Vapi grew to $8M over the past 5 years. Vapi has raised $20.1M and hit a $13.5M valuation in 2025. 

Voiceflow is a leading conversational AI platform designed to empower product teams in building, deploying, and scaling impactful AI agents across a wide range of use cases. Founded in 2019, Voiceflow emerged from a need to simplify the complex process of building AI agents, which had previously been limited by either overly simplistic tools or rigid legacy platforms.

Our mission is to provide a flexible, collaborative, and extensible platform that enables teams to build AI agents that are as powerful and intuitive as websites or mobile apps. Voiceflow’s mission is to empower ambitious teams to build the world’s best AI agents.