Gradium: Offers ultra-low latency speech-to-text and translation APIs geared towards real-time interactive voice applications. AssemblyAI records 453,591 monthly visits with -6.9% month-over-month growth and Freemium, Contact for Pricing pricing. Gradium records 126,416 monthly visits with +128.7% growth and Freemium, Contact for Pricing pricing.
Speech-to-text and voice intelligence APIs for developers
Real-time voice AI APIs with 50 ms to first audio
| Dimension / Metric | | |
|---|---|---|
| Official Domain | assemblyai.com | gradium.ai |
| Pricing Model | Freemium, Contact for Pricing | Freemium, Contact for Pricing |
| Monthly Visits | 453.59K (453,591) | 126.42K (126,416) |
| MoM Traffic Delta | -33.48K (-6.9%) | +71.15K (+128.7%) |
| Primary Market & Share | 🇧🇷 Brazil (30.6%) | 🇫🇷 France (26.5%) |
| Direct Visits / mo | 281.47K | 27.16K |
| User Rating | 4.6 | 4.5 |
| Supported Platforms | Website | Website |
Speech-to-text and voice intelligence APIs for developers
Choose pre-recorded transcription for files, a realtime API for live streams and voice agents, or a synchronous endpoint for short clips and dictation.
Layer summarization, sentiment, topic detection, PII redaction, content moderation and guardrails onto transcripts without building your own models.
AssemblyAI-TTS-1 is trained on real phone calls for natural, low-latency speech, targeted at IVR and voice-agent use cases.
Flagship models emphasise exact transcription, speaker labels and native code-switching across many languages, supported by published benchmarks.
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.
SpecialistEnterprise developer platform and API for deploying GPT-6 Astra, Sol, Luna, and realtime multimodal agents.
SpecialistEnterprise developer platform and API for deploying GPT-6 Astra, Sol, Luna, and realtime multimodal agents.
AI audio platform for speech, agents, music and dubbing
Free / Open-sourceStudio-grade AI text to speech and voice cloning
Ultra-fast AI inference on the LPU and LPX platform
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
SpecialistBuild, test, and deploy production-grade voice AI agents over API
Clone voice, control emotion, and create lifelike speech.
Clone voice, control emotion, and create lifelike speech.
One speech AI API for recognition, generation, and translation in 60+ languages
One speech AI API for recognition, generation, and translation in 60+ languages
Speech-to-text and audio intelligence API for production voice products
Speech-to-text and audio intelligence API for production voice products
SpecialistB2B AI audio models for stem separation, transcription, mastering, and voice processing
SpecialistB2B AI audio models for stem separation, transcription, mastering, and voice processing
Features mature enterprise transcription APIs with long-standing industry reliability, though real-time streaming capabilities are more limited.
Features mature enterprise transcription APIs with long-standing industry reliability, though real-time streaming capabilities are more limited.
