About This Site
Ultra-low-latency voice AI APIs for speech generation, transcription, translation, and cloning Gradium is a voice AI platform for developers that provides ultra-low-latency text-to-speech, speech-to-text, speech-to-speech translation, live translation, voice cloning, and on-device text-to-speech through a unified API. It is designed for building real-time voice agents and conversational applications, with expressive speech generation, accurate transcription, multilingual support, speaker cloning, bidirectional WebSocket streaming, scalable concurrency, and deployment options including cloud, dedicated instances, self-hosted, and on-premises infrastructure.
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Key Features AI
Core Features
Ultra-low-latency streaming text-to-speech with expressive voices
Accurate speech-to-text transcription with code-switching and custom vocabulary
Real-time speech-to-speech and live voice translation
Instant voice cloning from approximately 10 seconds of audio
High-fidelity Pro Voice Clones
Prompt-based voice design
Offline on-device text-to-speech running on CPU
Bidirectional WebSocket real-time API
Timestamp-accurate speech and pronunciation dictionaries
Semantic voice activity detection for conversational turn-taking
Scalable concurrency with stable latency under load
Cloud, dedicated, self-hosted, on-premises, and cloud marketplace deployment
Python and Rust SDKs
Integrations with LiveKit, Pipecat, Gradbot, and major agent frameworks
Telephony audio formats
Enterprise SLAs and zero data retention
Advantages
Supports a broad suite of voice AI capabilities through one platform
Designed for very low and stable latency in real-time applications
Offers multilingual speech, translation, regional accents, and voice cloning
Provides scalable infrastructure and multiple deployment options
Includes SDKs and integrations for popular voice-agent frameworks
Offers a free tier with 45,000 credits
Provides startup grants with $2,000 or more in free credits
缺点：Commercial use is not included in the Free plan
缺点：Advanced Pro Voice Clones are only included in higher-priced plans
缺点：Speech-to-speech translation consumes credits considerably faster than TTS or STT
缺点：Paid plans may be expensive for small teams with high usage
缺点：The platform is primarily developer-oriented and may require API or SDK integration work
缺点：The free plan has limited concurrency and voice clone allowances
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