12 alternatives to Vapi in Voice AI — Speech, Synthesis & Conversation. 5 of them are tracked direct competitors.
| Company | Pricing | Open source | Funding |
|---|---|---|---|
| Vapithis pageDeveloper platform for building voice AI agents. | Freemium | No | Seed |
| AssemblyAIdirect competitorSpeech-to-text and audio intelligence API platform. | Freemium | No | Series C |
| PlayAIdirect competitorConversational voice AI agent platform (from the Play.ht team). | Paid | No | Unknown |
| Retell AIdirect competitorVoice AI platform for building conversational phone agents. | Paid | No | Seed |
| Rime AIdirect competitorText-to-speech API platform focused on natural, low-latency voices. | — | — | — |
| WellSaid Labsdirect competitorEnterprise-grade text-to-speech voice platform. | Enterprise | No | Unknown |
| Bland AIPlatform for building automated AI phone-call agents. | Paid | No | Seed |
| CartesiaReal-time generative voice AI platform built on state-space models. | Paid | No | Seed |
| DeepgramSpeech-to-text API platform focused on speed and accuracy. | Paid | No | Series C |
| DescriptAudio/video editor with AI voice cloning (Overdub) and transcription. | Freemium | No | Series D+ |
| ElevenLabsLeading text-to-speech and voice-cloning AI platform. | Freemium | No | Series B |
| Hume AIAI platform focused on emotional expression in voice and language. | Freemium | No | Series B |
| LOVO AIAI voiceover and synthetic voice generation platform. | Freemium | No | Series A |
Direct competitors are curated relationships in the index. The remaining entries share the Voice AI — Speech, Synthesis & Conversation category.