Gradium records 126,416 monthly visits with +128.7% month-over-month growth and Freemium, Contact for Pricing pricing. HeyGen records 7,000,070 monthly visits with +9.4% growth and Freemium pricing.
Real-time voice AI APIs with 50 ms to first audio
Turn scripts into studio-quality AI avatar videos in minutes
| Dimension / Metric | | |
|---|---|---|
| Official Domain | gradium.ai | app.heygen.com |
| Pricing Model | Freemium, Contact for Pricing | Freemium |
| Monthly Visits | 126.42K (126,416) | 7M (7,000,070) |
| MoM Traffic Delta | +71.15K (+128.7%) | +599.16K (+9.4%) |
| Primary Market & Share | 🇫🇷 France (26.5%) | 🇺🇸 United States (18.5%) |
| Direct Visits / mo | 27.16K | 4.1M |
| User Rating | 4.5 | 4.8 |
| Supported Platforms | Website | Website |
Real-time voice AI APIs with 50 ms to first audio
Text-to-speech, speech-to-text, and live speech-to-speech translation reach roughly 50 ms to first audio, tuned for conversational agents rather than batch processing.
Clone a voice from a short sample for everyday use, move up to pro cloning for production quality, or generate a brand-new voice from a text description.
WebSocket streaming, Python and Rust SDKs, custom vocabulary, semantic VAD, and code-switching support make integration straightforward for agent builders.
Phonon is Gradium's openly available TTS model that runs on-device for offline or privacy-sensitive deployments.
Turn scripts into studio-quality AI avatar videos in minutes
Choose from 500+ stock presenters, use photo avatars, or train a custom Video Avatar that looks and sounds like you, then generate narrated videos straight from a script.
Localize one recording into 175+ languages and dialects with editable scripts, brand glossaries, voice switching and proofreading seats for native-language review.
An agentic workflow expands ideas into finished videos, with access to leading generative models for video and image generation on higher plans.
Add quizzes, branching and decision points, embed videos by link, and export SCORM packages so content drops straight into corporate learning systems.
SpecialistAll-in-one mobile and web video editor equipped with built-in AI avatar and captioning tools.
SpecialistAll-in-one mobile and web video editor equipped with built-in AI avatar and captioning tools.
SpecialistProvides industry-leading voice cloning and speech synthesis for realistic avatar narration.
SpecialistProvides industry-leading voice cloning and speech synthesis for realistic avatar narration.
Free / Open-sourceStudio-grade AI text to speech and voice cloning
SpecialistOffers browser-based video creation with AI avatar and voice generation tools.
SpecialistOffers browser-based video creation with AI avatar and voice generation tools.
Ultra-fast AI inference on the LPU and LPX platform
Provides accessible AI avatar video creation and talking-head templates, featuring a generous free tier but simpler editing tools.
Provides accessible AI avatar video creation and talking-head templates, featuring a generous free tier but simpler editing tools.
Industry-leading AI avatar creator focusing on corporate training and presentations, though with a different template selection and pricing structure.
Industry-leading AI avatar creator focusing on corporate training and presentations, though with a different template selection and pricing structure.
Real-time voice AI models and agents you can build on
Real-time speech-to-text, text-to-speech and voice agents in one API platform
Real-time speech-to-text, text-to-speech and voice agents in one API platform
SpecialistSpecializes in interactive conversational video agents with personalized memory, going beyond HeyGen's pre-rendered presenter videos.
SpecialistSpecializes in interactive conversational video agents with personalized memory, going beyond HeyGen's pre-rendered presenter videos.
SpecialistBuild, test, and deploy production-grade voice AI agents over API
Focuses on real-time conversational digital humans and talking-head videos, offering stronger interactive capabilities than HeyGen's studio builder.
Focuses on real-time conversational digital humans and talking-head videos, offering stronger interactive capabilities than HeyGen's studio builder.
