Matrix/Features/Custom / BYO voice
Which voice AI agent platforms have Custom / BYO voice?
Clone a voice, or plug in a third-party TTS voice.
8 Yes1 Partial2 Unknown
Verified Yes: Vapi, Retell AI, Bland AI, Cartesia Agents, ElevenLabs Agents, Deepgram Voice Agent API, LiveKit Agents, Ultravox.
| Platform | Status | What the vendor says | Source |
|---|---|---|---|
| Bland AIBland | Yes | Voice clones Custom voice clones can be trained per language. | Source |
| Cartesia AgentsCartesia | Yes | Pro Voice Cloning Pro Voice Cloning listed on pricing. | Source |
| Deepgram Voice Agent APIDeepgram | Yes | BYO TTS BYO TTS tier at $0.065/min. | Source |
| ElevenLabs AgentsElevenLabs | Yes | 10,000+ voices, cloning 10,000+ voices; Business plan includes 10 Professional Voice Clones. | Source |
| LiveKit AgentsLiveKit | Yes | Any TTS plugin Bring any TTS provider and its voices. | Source |
| Retell AIRetell AI | Yes | Clone voice API API reference includes a Clone Voice endpoint. | Source |
| UltravoxUltravox | Yes | Cloning + ExternalVoice 1 custom voice clone on Pay As You Go, 5 on Pro; docs also describe ExternalVoices from other TTS providers. | Source |
| VapiVapi | Yes | Custom voices Use custom or cloned voices from any supported TTS provider. | Source |
| OpenAI Realtime APIOpenAI | Partial | Custom voices (eligible) Prompt-to-voice for GPT-Live is generally available; voices from recordings work with the Realtime API but are "limited to eligible customers". | Source |
| SynthflowSynthflow | Unknown | No statement found on the official pages we checked. | — |
| VaaniVaani | Unknown | No statement found on the official pages we checked. | — |
Checked Nov 4, 2026. Filter the matrix by this feature →
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