Outspeed

What is Outspeed?

Outspeed is a developer platform for adding voice to apps. It provides a hosted speech-to-speech stack that sends and receives text and audio in real time over WebRTC, with voice activity detection and function calling, and its API is compatible with the OpenAI Realtime API. Developers create an agent in the dashboard, choose instructions and a voice, then connect it with the JavaScript, React or Swift SDK. Outspeed also sells text-to-speech with custom voice cloning and multi-speaker dialogue. The docs show example agents such as an HR interviewer, a therapist-style support agent and a conversational companion, and describe background noise removal, speaker recognition and emotion handling. Pricing is usage-based with no monthly commitment: text-to-speech is $2 per million characters and realtime voice calling is $1 per hour of call time.

Use cases

• Build realtime voice agents for apps
• Add a voice interface to a React app
• Create AI companions that speak
• Run AI interviewers for HR screening
• Generate speech from text
• Clone a custom voice
• Produce multi-speaker dialogue audio

Who it's for

• App developers
• Voice AI startups
• Product teams

Why use Outspeed

• Add a working voice agent to a React app with a few lines of code and a dashboard-configured agent.
• Existing OpenAI Realtime API code can be pointed at Outspeed because the API is compatible.
• Billing is per use, with no monthly commitment, so small projects stay inexpensive.
• Agent behavior can be edited in the dashboard without redeploying the app.

Outspeed features

• Hosted speech-to-speech stack over WebRTC
• OpenAI Realtime API compatibility
• Text and audio in and out in real time
• Voice activity detection
• Function calling to reach external tools
• JavaScript, React and Swift SDKs
• Text-to-speech with custom voice cloning
• Multi-speaker dialogue generation
• Webhooks for realtime voice calling
• Dashboard to configure agent instructions and voice

How to get started with Outspeed

1. Sign in to the Outspeed dashboard and create an agent with instructions and a voice.
2. Copy the agent ID and decide whether to enable authentication.
3. Install the JavaScript and React packages, or the Swift SDK for iOS.
4. Start a session from your app; the SDK manages the WebRTC connection and events.
5. Add tools and system tools so the agent can call external services.

Outspeed limitations

• Usage-based billing means cost scales with call time and characters
• Agent authentication should be enabled before production use

Outspeed pricing

Outspeed has no free plan. Plans start at $1 usage-based, according to the official pricing page on 24 Oct 2026.

Outspeed plans

• Text-to-Speech (TTS)

  $2 per million characters

  usage-based

  • Natural voice quality
  • Custom voice cloning
  • Multi-speaker dialogue

• Realtime Voice Calling

  $1 per hour of call time

  usage-based, billed per minute

  • Sub-second latency
  • Tool calling support
  • Webhooks integration

Plans as listed on the official pricing page on 24 Oct 2026. Prices can change and may vary by country or exclude tax. Check the official pricing page.

Outspeed alternatives

The main Outspeed alternatives listed on Debuly are Vapi, LiveKit, ElevenLabs, Deepgram, Inworld and OpenAI API. The table compares pricing and platforms; order is A–Z.

1. 

   Deepgram

   Voice AI platform with speech-to-text, text-to-speech and Voice Agent APIs, available as a managed API, in-VPC or self-hosted.

   Audio and voiceDeveloper platformsAutomation and agents
   FreemiumVisit Deepgram (official site)
2. 

   ElevenLabs

   AI audio platform for text to speech, voice cloning, dubbing, transcription, music and conversational voice agents, via app or API.

   Audio and voiceAutomation and agentsVideoDeveloper platforms
   FreemiumVisit ElevenLabs (official site)
3. 

   Inworld

   Realtime voice AI platform with text to speech, speech to text and hosted LLM inference, billed by usage through one API.

   Developer platformsAudio and voice
   FreemiumVisit Inworld (official site)
4. 

   LiveKit

   Open-source framework and cloud platform for building, deploying and monitoring realtime voice, video and AI agents.

   Developer platformsAudio and voiceAutomation and agents
   FreemiumVisit LiveKit (official site)
5. 

   OpenAI API

   Developer API for OpenAI's GPT models, image generation, realtime voice and transcription, priced per million tokens with batch and flex options.

   Developer platformsCodingAudio and voice
   PaidVisit OpenAI API (official site)
6. 

   Vapi

   Developer platform for building voice AI agents that handle phone and web calls, with per-minute pricing and optional success packages.

   Developer platformsAutomation and agentsAudio and voice
   PaidVisit Vapi (official site)

Outspeed FAQ

Sources & verification

Facts on this page come from the official sources below, each with the date we read it. Written by Debuly; the vendor did not review this page.

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