Inworld AI
Realtime TTS, STT, and LLM routing infrastructure for consumer-scale voice AI
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About Inworld AI
We benchmarked Inworld across interactive character AI pipelines. Its multi-modal character engine coordinates speech-to-text, emotional state machines, and real-time TTS with sub-100ms latency, enabling game NPCs to express dynamic emotions and physical gestures during conversations. The hurdle is complexity: managing emotional state graphs and safety filters across open-ended dialogue requires thoughtful design. With a flexible on-demand tier and $25/month creator plans, it is an elite platform for game studios and metaverse creators building believable AI characters.
Inworld AI is a research lab and inference provider building the realtime voice layer for consumer-facing AI applications. Its platform combines first-party Realtime Text-to-Speech and Speech-to-Text models with an LLM router that spans 220+ models from OpenAI, Anthropic, Google, and others, all accessible through modular APIs or a single unified Realtime API over one WebSocket connection.
Inworld's Realtime TTS-2 is consistently top-ranked on the Artificial Analysis Speech Arena, offering sub-100ms time-to-first-byte, natural-language voice steering, text-based voice design, and voice cloning from just 15 seconds of audio across 200+ languages. The Realtime STT model adds built-in voice profiling, surfacing emotion, age, accent, and pitch signals per audio chunk, while the Realtime Router intelligently selects and fails over between LLMs with zero markup on provider rates.
The platform is built for developers and product teams shipping voice agents, AI companions, interactive games, language-learning tools, and customer support systems at scale, with SOC 2 Type II, HIPAA, and GDPR compliance built in for enterprise deployments.
Key Features
- Realtime Text-to-Speech with sub-100ms time-to-first-byte and natural-language voice steering
- Realtime Speech-to-Text with built-in voice profiling for emotion, age, accent, and pitch
- Realtime API combining STT, LLM, and TTS over a single WebSocket for sub-second speech-to-speech latency
- LLM Router with zero-markup access to 220+ models from OpenAI, Anthropic, Google, and more
- Voice cloning from 15 seconds of audio with cross-lingual support across 200+ languages
- Text-based voice design that generates production-ready voices from written descriptions
- Intelligent turn-taking with context-aware semantic voice activity detection
- Fluent tool calling that lets voice agents invoke functions without breaking the audio stream
Pros
- Realtime TTS consistently ranks #1 on the Artificial Analysis Speech Arena in blind user tests
- Significantly cheaper than comparable providers like ElevenLabs and Deepgram at scale
- Single API and WebSocket connection covers STT, LLM routing, and TTS together
- Provider-agnostic LLM routing avoids vendor lock-in and lets teams swap models anytime
- Enterprise-grade compliance built in, including SOC 2 Type II, HIPAA, and GDPR
Cons
- Full pricing benefits require higher-tier paid plans, which may be costly for very small projects
- Advanced compliance features like HIPAA, BAA, and zero data retention are gated behind add-ons or Enterprise
- Professional voice cloning is only available from the Developer plan and above
- Some capabilities like WebRTC and SIP transport are still in early access rather than general availability
Pricing
Inworld AI uses a credit-based subscription model with a free On-Demand tier for evaluation and prototyping, including up to 70 minutes of TTS or 400 minutes of STT at no cost, with 100 custom voices and full Realtime API access under a commercial license.
Paid plans start with Creator at $25/month (up to 33% off base rates), Builder at $100/month (up to 40% off, workspace sharing), Developer at $300/month (up to 47% off, priority email support), and Growth at $1,500/month (up to 53% off, 30,000 custom voices, HIPAA and BAA add-ons). Realtime TTS-2 pricing ranges from $25 per million characters on-demand down to $12.50 on the Growth plan, with Realtime TTS-2 Flash starting at $15 and falling to $7.
Enterprise pricing is fully custom, with Realtime TTS-2 rates as low as $5 per million characters, price-match guarantees, SLAs, EU and India data residency, and a dedicated account manager. Unused subscription credits roll over for up to 3 months, and LLM usage through the Realtime Router is billed at provider cost with no markup.
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Frequently Asked Questions
Inworld AI provides realtime text-to-speech, speech-to-text, and LLM routing infrastructure that developers use to build voice agents, AI companions, interactive games, and customer support tools with sub-second latency.
Yes, the On-Demand plan is free and includes up to 70 minutes of TTS or 400 minutes of STT, voice cloning, voice design, and full Realtime API access under a commercial license, making it suitable for evaluation and prototyping.
Inworld's Realtime TTS-2 ranks above ElevenLabs on the Artificial Analysis Speech Arena in blind tests and is priced significantly lower per million characters, while also bundling speech-to-text and LLM routing into the same platform.
Yes, the Inworld Realtime Router provides access to 220+ models from providers including OpenAI, Anthropic, Google, xAI, Groq, and Mistral, billed at provider rates with zero markup and no code changes needed to switch models.
Yes, Inworld AI is SOC 2 Type II certified and HIPAA and GDPR compliant, with optional zero data retention, EU and India data residency, and dedicated enterprise support for regulated industries.
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