Inworld AI

Free plan APISelf-hostedWeb

What Inworld AI is

Inworld AI provides realtime speech and language tools for consumer-facing applications, with API, self-hosted, and web options. Its TTS-2 supports voice direction, voice cloning, and 200+ languages; the homepage states TTS-2 reaches its first byte in under 100 ms. The Realtime API carries speech in and out through one WebSocket and supports custom voices and tool calling. Realtime STT handles streaming transcription, timestamps, diarization, custom vocabulary, and voice signals such as emotion, age, accent, pitch, and style. Realtime Router can send requests to OpenAI, Anthropic, Google, and 220+ models, with failover, A/B testing, and analytics. Inworld also lists OpenAI compatibility, Twilio integration for TTS, an Unreal SDK, and a Unity SDK in early access. Its plans range from free usage-based On-Demand to paid plans from $25/mo; paid plans provide monthly credits equal to the plan price. It lists SOC 2 Type II certification and HIPAA and GDPR compliance. Zero data retention is available by request and listed as a Growth add-on.

Who it suits

It suits teams building consumer-facing applications in areas such as games and media, education, wellness, or social and companion experiences. Developers needing realtime speech APIs, voice cloning, or LLM routing may also find its listed tools relevant.

What it does well

TTS-2 supports voice cloning and 200+ languages.
Realtime API combines speech input and output over one WebSocket.
STT includes timestamps, diarization, and custom vocabulary.
Router supports 220+ models and failover.
Free On-Demand plan is available.

What to know first

Paid plans start at $25/mo.
Unity AI Runtime SDK is in early access.
Zero data retention is an add-on for Growth.

Limits

The free On-Demand plan includes up to 70 minutes of TTS, with usage-based rates for services such as TTS, STT and LLMs. Creator, the lowest priced paid plan, costs $25 a month and provides 25 USD in monthly credits.

Plans

Plan	Billed and limits	Price
On-Demand	Start free; usage-based rates · Up to 70 min TTS included · 100 custom voices · TTS-2 $25/1M chars · TTS-2 Flash $15/1M chars · STT 1 $0.15/hr · LLMs at cost	Free
Builder	$100/mo · $100 in credits per month · Up to 40% off TTS & STT rates · 3,000 custom voices · Increased concurrency limits	$100 a month
Growth	$1,500/mo · $1,500 in credits per month · Up to 53% off TTS & STT rates · 30,000 custom voices · Higher API concurrency & limits · ZDR, HIPAA & BAA (add-ons)	$1,500 a month
Creator	$25/mo · $25 in credits per month · Up to 33% off TTS & STT rates · 500 custom voices · 40K chars per TTS Playground request	$25 a month
Developer	$300/mo · $300 in credits per month · Up to 47% off TTS & STT rates · 10,000 custom voices · Priority email support	$300 a month
Enterprise	Custom pricing, limits & terms · TTS-2 as low as $5/1M · TTS-2 Flash sub-$5/1M · Custom STT and LLM pricing · SLA & DPA · EU & India data residency · Dedicated AM & Slack channel	On request

As inworld.ai lists them, read 2 Oct 2026. The maker's own page has the final word.

Getting started

Open Inworld AI’s website.
Choose API, self-hosted or web access for your deployment.
Start with the free On-Demand plan or select a paid subscription.
Use the Unreal AI Runtime SDK download if building with Unreal.
For Unity, review the AI Runtime SDK listed for early access.
Consult the documentation for OpenAI compatibility or the Twilio telephony integration.

Verdict

Inworld AI brings realtime speech, transcription, and model routing into a set of API, web, and self-hosted offerings. The free usage-based option provides an entry point, while advanced usage and support are tied to paid plans.

Questions

What does Inworld AI cost?

On-Demand is listed as free with usage-based rates. Paid plans start with Creator at $25 a month.

What platforms are available?

Inworld lists API, self-hosted and web platforms.

Does Inworld support voice cloning?

Yes. Realtime TTS-2 supports voice cloning.

Which integrations are listed?

The documentation lists OpenAI compatibility and a Twilio telephony integration for Realtime TTS.

Are game engine SDKs available?

The Unreal AI Runtime SDK is available for download. The Unity AI Runtime SDK is in early access.

What happens to unused paid-plan credits?

Unused subscription credits roll over for up to three months while the customer maintains an active paid plan of equal or higher value.

Facts from Inworld AI's own pages

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, 2 Oct 2026
Founded: 2021 · inworld.ai, 23 Sept 2026
Headquarters: Mountain View, California, United States · inworld.ai, 23 Sept 2026
Integrations: The documentation lists OpenAI compatibility and a Twilio telephony integration for Realtime TTS. · docs.inworld.ai, 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, 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, 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, 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, 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, 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, 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, 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, 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, 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, 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, 2 Oct 2026

Where Inworld AI stands on Freedom251

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