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Inworld TTS

Inworld TTS

Voice AI that’s 5% of the cost. 100% of the quality.

Website inworld.ai
Overview

What it is

Inworld builds the infrastructure for production voice AI. One platform with speech-to-text, an LLM router, and the top-ranked text-to-speech, all connected on a single API so context flows between every layer. Used by developers building voice agents, AI companions, and conversational apps.

Intent

I need it when

Build conversational AI applications with natural-sounding voice responses at scale

Inworld TTS delivers #1-ranked voice quality with sub-130ms latency, enabling real-time voice agents that feel human. Advanced voice direction, voice cloning, and 100+ language support allow developers to create emotionally expressive, multilingual conversational experiences without separate pipelines.

Ensure compliance and security for healthcare, education, or regulated deployments

SOC2 Type II, GDPR, and HIPAA compliance built-in. Growth and Enterprise tiers offer HIPAA/BAA add-ons, zero data retention, SLA/DPA, on-prem deployment, and EU/India data residency for regulated use cases.

Integrate speech-to-speech and LLM routing alongside TTS for end-to-end conversational AI

Inworld's unified platform combines Realtime TTS, Speech-to-Speech API, STT, and LLM Router. Single API handles full-duplex audio streaming, intelligent turn-taking, function calling, and context-aware model routing across 200+ LLMs without latency overhead.

Create custom branded voices for interactive media, games, and learning applications

Voice cloning from 15 seconds of audio, text-based voice design, and advanced voice direction (tone, speed, volume, pauses) enable creators to design production-ready custom voices. Cross-lingual cloning lets a single voice speak 15+ languages natively without accent carryover.

Reduce text-to-speech costs while maintaining production-quality audio

Inworld TTS costs from $15/million characters at Enterprise tier (up to 80% cheaper than competitors) and offers volume discounts up to 40% off at Growth tier. Developer and Creator tiers provide affordable entry points with predictable monthly credits.

Drop

Not a fit when

  • User requires on-premises deployment without enterprise plan; on-prem only available at Enterprise tier
  • User needs sub-100ms latency for all use cases; Mini model offers <130ms but Max/TTS-2 offer <250ms P90
  • User requires support for languages beyond 100; platform supports 100+ languages but not all world languages
  • User needs real-time voice synthesis without any API integration; product requires developer integration via API
  • User operates in highly regulated industry without compliance add-ons; HIPAA and BAA available only as add-ons at Growth tier and above
Commercials

Pricing

Usage-based with monthly subscription tiers. TTS pricing from $15–$35 per million characters depending on model and tier. Free tier includes up to 40 minutes of TTS. Paid plans (Creator $25/mo, Developer $300/mo, Growth $1,500/mo) include monthly credits and volume discounts up to 40% off. View pricing