What is Inworld AI?
Inworld AI is a research lab and inference provider for realtime AI. It offers first-party TTS (text-to-speech) and STT (speech-to-text) models, a router to 100+ LLMs, and the underlying inference, all exposed through modular APIs.
Developers use the Realtime API to build voice agents, companions, narrators, game characters and training tools. TTS-2 supports bracketed direction for tone, speed and pauses, voice cloning from 15 seconds of audio, text-based voice design, and speech in 200+ languages. Reported latency is under 100ms TTFB for TTS-2 and 25ms for TTS-2 Flash.
Key features
- Realtime text-to-speech with bracketed voice direction (tone, speed, pauses)
- Voice cloning from 15 seconds of audio
- Text-based voice design from accent, age and tone descriptions
- Speech-to-text (STT 1) model
- LLM router with access to 100+ models
- Realtime API with under 100ms TTFB for TTS-2
Who is it for
- Developers building voice agents and voice-first apps
- Game studios and makers of AI companions
- Edtech and language-learning companies
- Enterprises needing compliance (SLA, DPA, HIPAA on higher tiers)
Pros and cons
- Top-ranked TTS quality on Artificial Analysis, according to the company
- Low latency suitable for realtime voice agents
- Cross-lingual voice cloning across 200+ languages
- Enterprise pricing, limits and terms are custom and require contacting sales
- Compliance features like ZDR, HIPAA and BAA are add-ons on the Growth plan
Inworld AI pricing
| Plan | Price | Includes |
|---|---|---|
| On-Demand | 0 USD / empty | Evaluation and prototyping. TTS-2 at 25 USD/1M chars, TTS-2 Flash at 15 USD/1M chars, STT 1 at 0.15 USD/hr; up to 70 min TTS included, 100 custom voices, community support |
| Creator | 25 USD / month | Content creation and small projects. 25 USD in credits per month, TTS-2 at 20 USD/1M chars, TTS-2 Flash at 10 USD/1M chars, STT 1 at 0.10 USD/hr; 500 custom voices, 40K chars per TTS Playground request |
| Builder | 100 USD / month | Growing projects and small teams. 100 USD in credits per month, TTS-2 at 17.50 USD/1M chars, TTS-2 Flash at 9 USD/1M chars, STT 1 at 0.10 USD/hr; 3,000 custom voices, increased concurrency |
| Developer | 300 USD / month | Production applications. 300 USD in credits per month, TTS-2 at 15 USD/1M chars, TTS-2 Flash at 8 USD/1M chars, STT 1 at 0.10 USD/hr; 10,000 custom voices, priority email support, professional voice cloning as add-on |
| Growth | 1500 USD / month | Large deployments and compliance. 1,500 USD in credits per month, TTS-2 at 12.50 USD/1M chars, TTS-2 Flash at 7 USD/1M chars, STT 1 at 0.10 USD/hr; 30,000 custom voices, ZDR, HIPAA and BAA as add-ons |
Prices copied from Inworld AI pricing, checked October 12, 2026. Currency as shown by the vendor; taxes may apply.
Is Inworld AI free?
There is a free trial. On-Demand plan: start free for evaluation and prototyping, with up to 70 min of TTS included, 100 custom voices, voice cloning and design, Realtime API access and community support.
Inworld AI alternatives
| Tool | Price from | Free plan | Category |
|---|---|---|---|
 ElevenLabs | 6 USD/mo | yes | Voice & text to speech |
 Voice.ai | 5 USD/mo | yes | Voice & text to speech |
 Fish Audio | not listed | yes | Voice & text to speech |
 Speechify | 29 USD/mo | yes | Voice & text to speech |
 WellSaid | 10 USD/mo | trial | Voice & text to speech |
 Narakeet | not listed | trial | Voice & text to speech |
All alternatives to Inworld AI →
FAQ
What is Inworld AI used for?
Realtime text-to-speech, speech-to-text and LLM serving via APIs, for developers building consumer-facing voice and AI apps.
Is Inworld AI free?
There is a free trial. On-Demand plan: start free for evaluation and prototyping, with up to 70 min of TTS included, 100 custom voices, voice cloning and design, Realtime API access and community support.
How much does Inworld AI cost?
The cheapest paid plan is 25 USD/mo (vendor pricing, October 12, 2026).
What are the best Inworld AI alternatives?
Closest alternatives: ElevenLabs, Voice.ai, Fish Audio, Speechify, WellSaid.
Data checked October 12, 2026 on the vendor website (inworld.ai).