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Voice Assistants

Resona

Real-time speech-to-speech API for building natural, interruption-aware voice agents

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resona.dev
Verified API available
What is it Real-time speech-to-speech API for building natural, interruption-aware voice agents
Pricing Paid
Free tier No
Platform API
API Yes
Best for building customer service voice agents, creating interactive voice response systems
Domain registered 2025

Data updated Aug. 1, 2026

What does Resona do?

Resona is a real-time speech-to-speech API that enables developers to build natural, interruption-aware voice agents. The platform processes audio input and generates voice responses with minimal latency, typically between 1-3 seconds, creating conversational experiences that feel human-like. It handles full-duplex streaming through WebRTC or WebSocket connections, allowing for seamless two-way communication.

The API supports 12 languages without additional configuration and includes advanced features like noise and echo cancellation for real-world usage. It achieves an 84% score on ComplexFuncBench for tool use accuracy, leading the industry by 12.5%. Developers can integrate custom voices or clone existing ones, and the system supports sessions up to two hours long for extended interactions.

This tool is particularly valuable for businesses building customer service automation, interactive voice response systems, or any application requiring natural voice interactions. Telecommunications companies can leverage the SIP integration to connect directly to phone networks, while developers appreciate the straightforward API documentation and quick setup process.

Call AnsweringLive translationsText-to-SpeechVoice Assistants
#realtime-api#speech-to-speech#telephony integration#voice agents#voice ai#voice cloning#webrtc

Key features

What makes it stand out
01
Low latency responses (1-3 seconds) with natural thinking pauses
02
Full-duplex streaming via WebRTC/WebSocket for bidirectional communication
03
Supports 12 languages with zero configuration required
04
Enterprise-ready with dedicated isolated clusters and SIP telephony integration
05
Built-in noise and echo cancellation for real-world environments

Who is Resona for?

Who benefits most from this tool
building customer service voice agents
creating interactive voice response systems
developing real-time voice applications

Pricing

Voice

Custom
  • 4.5 per hour
  • 0.0013 per second
  • Real-time speech processing
  • Low latency (1-3 seconds)
  • Natural thinking pauses
  • Bi-directional streaming
  • 12 languages support
  • Tool use capabilities
  • Noise and echo cancellation
  • Up to 2-hour sessions
  • Voice cloning

Chat

Custom
  • 30 per million tokens
  • Text processing
  • Tool use capabilities

Knowledge base

Custom
  • 30 per million characters
  • Document indexing
  • Character processing

Trust & presence

Domain Domain registered 2025

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