Inworld AI

Realtime TTS-2 with 100ms TTFB

Inworld's Realtime TTS-2 delivers a 100ms time-to-first-byte (20ms for TTS-2 Flash), enabling voice agents to respond before users notice a delay. It ranks #1 in realtime TTS quality, with 3 of the top 5 models on Artificial Analysis being Inworld.

Keep every user engaged with natural, realtime text-to-speech that feels human.

Advanced Voice Direction

Add bracketed instructions anywhere in your text to adjust tone, speed, volume, vocal style, and pauses. Blind tests by thousands of real users confirm the output is extremely natural and faithful to the steering prompt, even when hyper-specific.

Unlock a new axis of expressiveness to keep experiences fresh and avoid bland, robotic output.

Instant Voice Cloning & Localization

Create a custom voice from just 15 seconds of audio, then localize it to speak 15 supported languages as a native speaker with the same identity and no accent carryover. Supports 200+ languages including English, Spanish, French, Korean, Chinese, Hindi, Japanese, and German.

Deploy globally without separate pipelines, maintaining consistent voice identity across markets.

Skip Recording Entirely

Describe accent, age, tone, and energy in natural language, and Inworld renders a production-ready voice on the fly. No studio time or voice talent needed.

Rapidly prototype and produce custom voices for any character or brand.

Controllable Speech-to-Speech

The Realtime API enables end-to-end speech-to-speech that understands, reasons, and interacts. It combines top-ranked TTS, STT, and LLM routing for realtime conversation.

Build voice agents that can hold natural, context-aware conversations in real time.

Pricing Cut in Half or More

Inworld reduced prices across the whole stack. Realtime TTS is $12.50 per 1M characters on the Growth plan vs ElevenLabs' $100, and Realtime STT is $0.10/hour vs Deepgram's $0.46. LLM router adds 0% markup, and dedicated GPUs start at $5/hour.

Scale consumer apps affordably while maintaining high-quality voice AI.

• Top-ranked realtime voice AIInworld is ranked #1 for realtime voice AI, with top-ranked text-to-speech, speech-to-speech, and LLM routing built for realtime conversation. Its Realtime TTS-2 is #1 by real users on the Artificial Analysis Speech Arena, with 3 of the top 5 models on Artificial Analysis being Inworld.
• Low latency and cost efficiencyInworld offers sub-130ms first-chunk latency for Mini and under 250ms P90 for Max and Realtime TTS-2. Pricing is significantly lower than alternatives: Realtime TTS at $12.50/1M chars on Growth plan vs ElevenLabs' $100, Realtime STT at $0.10/hr vs Deepgram's $0.46, and 0% LLM markup vs typical 5%.
• Advanced voice control and cloningRealtime TTS-2 supports bracketed steering instructions for tone, speed, volume, vocal style, and pauses. Voice cloning works from 15 seconds of audio, supports cross-lingual cloning across 100+ languages, and text-based voice design lets you describe accent, age, tone, and energy to generate a production-ready voice.
• Scalable pricing plansInworld offers flexible plans from free On-Demand to Enterprise. Growth plan at $1,500/mo includes $1,500 in credits, up to 53% off TTS/STT rates, 30,000 custom voices, and add-ons like ZDR, HIPAA & BAA. Enterprise offers custom pricing, on-prem deployment, EU & India data residency, and dedicated support.

• Pricing comparisons are datedThe cost comparison table references 'Provider rates, June 2026' and specific competitor prices (ElevenLabs, Deepgram). These figures may change and are not guaranteed current. Always verify current rates on the pricing page or with sales.
• Plan features vary by tierFeatures like custom voices, concurrency limits, and professional voice cloning differ across plans. For example, On-Demand includes 100 custom voices, while Creator includes 500, Builder 3,000, Developer 10,000, and Growth 30,000. Professional voice cloning is an add-on for Developer and included in Growth (1 clone).
• Credits and usage limitsPlans provide monthly credits (e.g., $25 for Creator, $100 for Builder, $300 for Developer, $1,500 for Growth) that can be used across TTS, STT, and LLMs. On-Demand includes up to 70 minutes of TTS. Exceeding credits or limits may incur additional costs; check the pricing page for details.
• Enterprise terms are customEnterprise pricing, limits, and terms are custom and require contacting sales. Features like price match, custom SLA & DPA, on-prem deployment, and EU & India data residency are only available on Enterprise, not on lower tiers.

Realtime Voice Agents

Inworld's Realtime API enables speech-to-speech voice agents that understand, reason, and interact with users in real time. With 100ms TTFB for Realtime TTS-2 and 20ms for TTS-2 Flash, agents respond before users notice a delay, making it ideal for customer support, virtual assistants, and other conversational applications.

Gaming & Interactive Storytelling

Inworld powers AI-native games and interactive narratives with emotionally expressive voice synthesis. Developers can create characters with full control over tone, speed, volume, vocal style, and pauses using bracketed instructions, making NPCs feel real and deeply connect with players.

Social & Companion Apps

Inworld supports voice-first companions at scale, as demonstrated by OtherHalf, which reached 1M users in 19 days. The platform is built for relationship-building, emotional connection, and entertainment, with ongoing, personal, and emotionally engaging AI interaction.

Learning & Education

Inworld's TTS-2 supports 200+ languages with cross-lingual voice cloning, enabling language learning platforms to offer native-sounding speech without accent carryover. This helps break down borders in education, as noted by TalkPal, and brings voice AI to kids around the world safely and compliantly.

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