Best Alternatives to Inworld AI

Ultravox (formerly Fixie.ai)

Real-time, speech-native voice AI platform that processes audio directly without text conversion, enabling fast, natural voice conversations for AI agents with sub-second latency and preservation of paralinguistic signals.

From Free

Vapi

Build production-ready voice AI agents with modular STT, LLM, and TTS components - developers control every aspect of real-time conversation pipelines for phone and web deployment

From $0.05/minute + provider costs

Ultravox

Breakthrough real-time voice AI infrastructure that processes speech natively without ASR conversion, delivering human-like conversational agents with sub-300ms latency at $0.05/minute - 3x cheaper than GPT-4o Realtime while maintaining enterprise-grade performance and scalability.

Klariqo

AI voice agents that automate lead pre-qualification for BPOs and call centers with direct SIP integration. Connects to VICIdial and Trackdrive to filter voicemails and unqualified leads, then warm-transfers qualified prospects to human closers in under 0.5 seconds response time.