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Inworld AI

Realtime speech-to-speech, TTS and STT APIs for consumer-facing voice apps.

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Price
Free + from $25/mo
Founded
Not available
HQ
Not available
Employees
Not available

About Inworld AI

Inworld has narrowed from game characters to realtime voice infrastructure: speech-to-speech, text-to-speech and speech-to-text wired to LLMs for building voice agents. The On-Demand tier is free with up to 70 minutes of TTS. LLM usage is billed at cost.

Key platforms

Core service areas

Speech-to-speech

Realtime voice conversation

Text-to-speech

TTS-2 and TTS-2 Flash models

Speech-to-text

STT 1 transcription

LLM integration

Billed at provider cost

Credit tiers

$25 to $1,500 a month

Enterprise

HIPAA, BAA and data residency options

Pros and cons

Pros

  • Free tier with up to 70 minutes of TTS included
  • Per-unit rates fall as you move up tiers
  • LLM usage billed at provider cost rather than marked up
  • Enterprise options include HIPAA, BAA and data residency

Cons

  • Credit-bucket pricing makes small-scale costs harder to forecast
  • Requires engineering work rather than a ready-made app

Frequently asked questions

01
How much does Inworld AI cost?
Free On-Demand with up to 70 minutes of TTS, then Creator $25, Builder $100, Developer $300 and Growth $1,500 a month in credits. Q: What are the per-unit rates? A: TTS-2 runs $25 to $5 per million characters and STT 1 runs $0.15 to $0.10 per hour, depending on tier. Q: What are good alternatives to Inworld AI? A: AssemblyAI and ElevenLabs.

Best for

Developers building voice agents or talking characters into consumer apps.

Pricing details

On-Demand free with up to 70 minutes TTS. Creator $25/month, Builder $100, Developer $300, Growth $1,500, each giving matching credits. Enterprise custom with price matching. TTS-2 $25-$5 per 1M characters, TTS-2 Flash $15 to under $5, STT 1 $0.15-$0.10 per hour. LLMs billed at cost. Details: https://inworld.ai/pricing

Review notes

  • Last reviewed

    October 4, 2026

  • Source

    inworld.ai

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