> ## Documentation Index
> Fetch the complete documentation index at: https://orb-ui.com/docs/llms.txt
> Use this file to discover all available pages before exploring further.

# Voice Agent Platforms for React Developers

> Compare where the UI layer fits across voice agent platforms like Vapi, ElevenLabs, LiveKit, OpenAI Realtime, Gemini Live API, Retell AI, Bland AI, and Synthflow.

Voice agent platforms can provide speech, realtime audio, call orchestration, tool calls, and deployment. React teams still need a clear frontend layer for state, activity, and trust.

orb-ui is intentionally narrow. It is the React UI layer that can sit on top of provider stacks.

## Where orb-ui fits

| Layer                | Examples                                      | orb-ui role                                    |
| -------------------- | --------------------------------------------- | ---------------------------------------------- |
| Voice agent platform | Vapi, LiveKit, Retell AI, Bland AI, Synthflow | Render the visible state layer                 |
| Realtime model API   | OpenAI Realtime, Gemini Live API              | Use the dedicated provider adapter             |
| Voice generation     | ElevenLabs                                    | Render conversational state and audio activity |
| Custom backend       | WebRTC, WebSocket, telephony                  | Use controlled mode or write an adapter        |

## Comparison posture

When comparing tools, keep the distinction clear:

* Vapi is a voice agent platform.
* LiveKit Agents can provide realtime media infrastructure for voice agents.
* ElevenLabs can provide voice and conversational agent capabilities.
* OpenAI Realtime and Gemini Live API are lower-level realtime model APIs.
* orb-ui is the frontend component layer.

That distinction is better for trust and more useful for developers than pretending everything is interchangeable.

## Related pages

* [Vapi adapter](/docs/adapters/vapi)
* [ElevenLabs adapter](/docs/adapters/elevenlabs)
* [LiveKit adapter](/docs/adapters/livekit)
* [OpenAI Realtime adapter](/docs/adapters/openai-realtime)
* [Gemini Live adapter](/docs/adapters/gemini-live)