Murf generates voiceovers and conversational agents with text-to-speech APIs for real-time conversations.
Inworld
Inworld provides real-time text-to-speech, speech-to-text, and language model inference through modular APIs.
About Inworld
Inworld is a research lab and inference provider focused on realtime AI for consumer-facing applications. It offers first-party text-to-speech and speech-to-text models alongside the large language models a customer chooses, plus the inference layer underneath, all delivered through modular APIs covering realtime TTS, realtime STT, LLM routing and dedicated GPU capacity.
Key features
- Realtime TTS-2 with under 100ms time to first byte
- TTS-2 Flash variant with 25ms time to first byte
- Realtime speech-to-text API alongside text-to-speech
- Voice cloning from 15 seconds of audio, cross-lingual in 200+ languages
- Text-based voice design from described accent, age, tone and energy
- Bracketed voice-direction instructions adjust tone, speed, volume and pauses
Best for: Developers and product teams building consumer-facing voice agents, companions, games or learning apps that need realtime speech and language model inference through APIs.
Good for
- Modular APIs cover TTS, STT, LLM routing and the underlying inference in one provider
- Stated latency targets of under 100ms TTFB for TTS-2 and 25ms for TTS-2 Flash
- Cloned voices can be localized to 200+ languages while retaining speaker identity
Watch out for
- A full public price list is not shown; listed rates are comparative examples tied to the Growth plan and enterprise scale
- Cost-comparison and quality figures come from the vendor's own published rates and comparisons rather than independent measurement
- Voice cloning and cloud-based speech services involve uploading audio, so output quality and usage depend on the vendor's infrastructure
Inworld at a glance
- Website
- inworld.ai
- Category
- AI & Machine Learning › AI Voice & Audio
- Type
- Online tool
- Pricing
- Not confirmed. Check the site
- Platforms
- Web
- Open source
- Not stated
- Language
- English
- Last checked
- Oct 6, 2026 · Online when checked
- Listed
- Oct 5, 2026
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Inworld FAQ
How fast is Inworld's realtime text-to-speech?
The site states under 100ms time to first byte for Realtime TTS-2 and 25ms for Realtime TTS-2 Flash.
How much audio is needed to create a cloned voice?
According to the site, a custom voice can be created from 15 seconds of audio and then localized to speak 200+ languages.
Does Inworld add a markup on language model usage?
The site says its LLM Router adds no markup, compared with a 5% markup it attributes to a typical gateway.
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