Gradium vs. Inworld TTS Comparison


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About Gradium is a voice AI platform for developers and organizations building speech-enabled applications and conversational agents. Its hosted APIs provide streaming text-to-speech, speech-to-text, speech translation, and speech-to-speech, with WebSocket and REST interfaces, real-time turn detection, pronunciation controls, and voice design or cloning features. A browser-based studio lets users try the models and manage voices, while documentation and SDK guides support application development. Use cases include voice agents, customer-service automation, live transcription, multilingual voice experiences, and spoken content generation. Gradium also publishes Phonon, an open-weight text-to-speech model designed for local, offline use in applications and on-device systems. Plans use credits for speech generation, transcription, and translation.	About Inworld TTS is a state-of-the-art text-to-speech platform designed to deliver ultra-realistic, context-aware speech synthesis and precise voice-cloning capabilities at a radically accessible price. The flagship model, TTS-1, is optimized for real-time applications and supports low-latency streaming (first audio chunk in ≈200 ms) as well as multiple languages (including English, Spanish, French, Korean, Chinese, and more). Developers can use instant zero-shot voice cloning (5-15 seconds of audio) or professional fine-tuned cloning, add voice-tags for emotion, style, and non-verbal sounds, and switch languages while preserving voice identity. The larger TTS-1-Max model (in preview) offers even more expressive speech and multilingual strength. The platform supports both API and portal access, streaming or batch mode, and is designed for everything from interactive voice agents and gaming characters to branded audio experiences.
Platforms Supported Windows Not Supported Mac Not Supported Linux Not Supported Cloud Supported On-Premises Supported iPhone Not Supported iPad Not Supported Android Not Supported Chromebook Not Supported	Platforms Supported Windows Not Supported Mac Not Supported Linux Not Supported Cloud Supported On-Premises Supported iPhone Not Supported iPad Not Supported Android Not Supported Chromebook Not Supported
Audience Developers and organizations building voice-enabled applications, conversational agents, and speech workflows, including enterprise teams.	Audience Developers and businesses looking for a tool offering multilingual voice synthesis and custom-voice cloning at scale
Support Phone Support Not Supported 24/7 Live Support Not Supported Online Supported	Support Phone Support Not Supported 24/7 Live Support Not Supported Online Supported
API Offers API Supported	API Offers API Supported
Screenshots and Videos No images available	Screenshots and Videos View more images or videos
Pricing $0/month The free tier includes 45,000 credits. The XS plan is $13/month and includes 225,000 credits. Credits are shared across speech services; monthly plan credits do not roll over. Annual billing saves one month. Free Version Supported Free Trial Not Supported	Pricing $0.005 per minute Free Version Not Supported Free Trial Not Supported
Reviews/Ratings Overall 0.0 / 5 ease 0.0 / 5 features 0.0 / 5 design 0.0 / 5 support 0.0 / 5 This software hasn't been reviewed yet. Be the first to provide a review: Review this Software	Reviews/Ratings Overall 0.0 / 5 ease 0.0 / 5 features 0.0 / 5 design 0.0 / 5 support 0.0 / 5 This software hasn't been reviewed yet. Be the first to provide a review: Review this Software

Training Documentation Supported Webinars Not Supported Live Online Not Supported In Person Not Supported	Training Documentation Supported Webinars Not Supported Live Online Supported In Person Not Supported
Company Information Gradium Founded: 2025 France gradium.ai/	Company Information Inworld Founded: 2021 United States inworld.ai/tts
Alternatives Supavocal	Alternatives Gemini 3.1 Flash TTS Google
Rekam AI	Gemini 3.8 Flash-Lite TTS Google
OpenAI Realtime API OpenAI	Gemini 3.8 Flash TTS Google
Fish Audio Hanabi AI	Qwen3-TTS Alibaba
Murf AI View All	Chirp 3 Google View All
Categories Artificial Intelligence (AI) APIs Supported Speech to Text Supported Text to Speech Supported Voice Cloning Supported	Categories AI Voice Models Supported Text to Speech Supported Text-to-Speech (TTS) Models Supported

Integrations LiveKit Supported Claude Not Supported Eden AI Supported Fireworks AI Not Supported Google AI Overviews Not Supported Groq Not Supported Inworld Not Supported Mistral AI Not Supported OpenAI Not Supported Pipecat Supported Tenstorrent DevCloud Not Supported Vapi AI Not Supported gpt-oss-20b Not Supported Show More Integrations View All 3 Integrations	Integrations LiveKit Supported Claude Supported Eden AI Not Supported Fireworks AI Supported Google AI Overviews Supported Groq Supported Inworld Supported Mistral AI Supported OpenAI Supported Pipecat Not Supported Tenstorrent DevCloud Supported Vapi AI Supported gpt-oss-20b Supported Show More Integrations View All 11 Integrations
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