Best Alternatives to ElevenLabs Realtime in 2025

The closest direct substitute if you are already in the OpenAI ecosystem. It offers native speech-to-speech over WebSocket with low latency, built-in tool calling, and broad SDK support. Since ElevenLabs Realtime exposes an OpenAI-compatible Realtime API, switching is often a base-URL change, making this the lowest-friction alternative for teams standardized on OpenAI models.

AI‑powered voice assistant API

A strong choice if you want an orchestration layer rather than raw models. Vapi handles telephony, call routing, turn-taking, and agent workflows, and lets you plug in different STT, LLM, and TTS providers, including ElevenLabs voices. It is ideal for production voice agents that need phone numbers, analytics, and multi-provider flexibility out of the box.

Best for teams building phone-based voice agents quickly. Retell provides managed telephony, low-latency turn-taking, interruption handling, and a no-code/low-code agent builder, with support for multiple LLM and voice providers. It competes on fast deployment and call-quality tuning rather than raw model ownership.

A compelling option when speech recognition accuracy and latency are the priority. Deepgram combines its fast STT with TTS and LLM orchestration in a single voice-agent API, with strong enterprise controls and on-prem options. It suits teams that value Deepgram's ASR leadership and predictable pricing.

The best open-source-leaning alternative for full control. LiveKit provides real-time WebRTC infrastructure plus an agents framework that orchestrates STT, LLM, and TTS pipelines, and it supports OpenAI Realtime and other speech-to-speech models. It is ideal for teams that want to self-host, customize the pipeline, and avoid vendor lock-in.

A solid alternative focused on low-latency conversational voice with high-quality cloned voices. PlayAI offers realtime speech-to-speech and TTS APIs with competitive latency and multilingual support, making it a fit for voice agents where voice quality and cloning are central and you want a dedicated voice-model vendor.

Best for AWS-centric organizations. Nova Sonic provides speech-to-speech conversational AI through Bedrock with low latency, tool use, and tight integration with AWS security, IAM, and data controls. It is the natural pick when compliance, existing AWS commitments, and managed infrastructure outweigh ecosystem breadth.