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Inworld AI
Mountain View, California, United States
What it is
Inworld AI provides realtime speech tools and language-model routing for consumer-facing applications. Its offerings include text-to-speech, speech-to-text, an API for speech input and output, and a router for language-model requests. Realtime TTS-2 supports voice direction, voice cloning, and more than 200 languages; the homepage states time to first byte under 100 ms. The Realtime API carries speech in and out over one WebSocket and supports custom voices and tool calling. Streaming speech recognition includes timestamps, diarization, custom vocabulary, and voice-profile signals for emotion, age, accent, pitch, and style. Realtime Router can route across OpenAI, Anthropic, Google, and more than 220 models, with failover, A/B testing, and analytics. The service is available through API, self-hosted, and web options. On-Demand starts free with usage-based rates; paid plans start at $25 per month and provide credits equal to the plan price. Unused subscription credits roll over for up to three months while an active paid plan of equal or higher value is maintained. Listed integrations include OpenAI compatibility and Twilio for Realtime TTS; Unreal and Unity runtime SDKs are also listed, with Unity in early access.
For and against
For
- Realtime TTS-2 supports voice cloning and 200+ languages
- Speech API uses one WebSocket for input and output
- Router covers OpenAI, Anthropic, Google, and 220+ models
- SOC 2 Type II certified; HIPAA and GDPR compliant
Against
- On-Demand usage is charged at usage-based rates
- Unity AI Runtime SDK is in early access
- Zero data retention is an account option or add-on
The verdict
Inworld AI combines realtime speech features with routing across multiple language-model providers. Its free On-Demand option uses usage-based rates, while subscriptions start at $25 per month and include plan-priced credits.
Who it suits
It suits teams building consumer-facing applications that need realtime speech generation, transcription, or language-model routing. Listed solution areas include social and companion products, education, health and wellness, agentic workforce, and games and media.
Plans and prices
On-Demand
Up to 70 min TTS included · 100 custom voices · TTS-2 $25/1M chars · TTS-2 Flash $15/1M chars
Read 2 Oct 2026 · inworld.ai
Creator
$25 in credits per month · Up to 33% off TTS & STT rates · 500 custom voices · 40K chars per TTS Playground request
Read 2 Oct 2026 · inworld.ai
Builder
$100 in credits per month · Up to 40% off TTS & STT rates · 3,000 custom voices · Increased concurrency limits
Read 2 Oct 2026 · inworld.ai
Developer
$300 in credits per month · Up to 47% off TTS & STT rates · 10,000 custom voices · Priority email support
Read 2 Oct 2026 · inworld.ai
Growth
$1,500 in credits per month · Up to 53% off TTS & STT rates · 30,000 custom voices · Higher API concurrency & limits
Read 2 Oct 2026 · inworld.ai
Enterprise
TTS-2 as low as $5/1M · TTS-2 Flash sub-$5/1M · Custom STT and LLM pricing · SLA & DPA
Read 2 Oct 2026 · inworld.ai
On the record
- Company
- Inworld’s privacy policy says it is headquartered in the United States; its jobs privacy page gives a Mountain View, California address.inworld.ai · read 2 Oct 2026
- Integrations
- The documentation lists OpenAI compatibility and a Twilio telephony integration for Realtime TTS.docs.inworld.ai · read 2 Oct 2026
- LLM routing
- Realtime Router routes requests across OpenAI, Anthropic, Google, and 220+ models, and the page states it adds zero markup and includes failover, A/B testing, and analytics.inworld.ai · read 2 Oct 2026
- Product
- Inworld describes itself as a research lab and inference provider for realtime AI at consumer scale, with first-party TTS and STT models and customer-selected LLMs.inworld.ai · read 2 Oct 2026
- Realtime API
- The Realtime API provides speech-in and speech-out over one WebSocket, with custom voices and tool calling.inworld.ai · read 2 Oct 2026
- Realtime STT
- Realtime STT offers streaming transcription, voice profiling signals for emotion, age, accent, pitch, and style, custom vocabulary, timestamps, and diarization.inworld.ai · read 2 Oct 2026
- Realtime TTS
- Realtime TTS-2 supports voice direction, voice cloning, and 200+ languages, and the homepage states under 100 ms time to first byte for TTS-2.inworld.ai · read 2 Oct 2026
- SDKs
- Inworld says its Unreal AI Runtime SDK is available for download and its Unity AI Runtime SDK is available for early access.inworld.ai · read 2 Oct 2026
- Security
- Inworld states it has SOC 2 Type II certification and HIPAA and GDPR compliance, and describes AES encryption for data at rest and in transit.inworld.ai · read 2 Oct 2026
- Support
- The pricing page lists community support on On-Demand through Builder, priority email support on Developer and Growth, and an account manager plus Slack channel for Enterprise.inworld.ai · read 2 Oct 2026
- Usage credits
- Paid plans provide monthly credits equal to the plan price, and unused subscription credits roll over for up to three months while the customer maintains an active paid plan of equal or higher value.inworld.ai · read 2 Oct 2026
- Who it serves
- Inworld says its products are for consumer-facing applications, with solution areas including social and companions, learning and education, health and wellness, agentic workforce, and games and media.inworld.ai · read 2 Oct 2026
- Zero data retention
- The security page says customers can ask Inworld to enable zero data retention for their account; pricing lists ZDR as an add-on for Growth.inworld.ai · read 2 Oct 2026
