Soniox: Delivers high-accuracy speech-to-text and translation across numerous languages, but with a more streamlined feature set. AssemblyAI records 453,591 monthly visits with -6.9% month-over-month growth and Freemium, Contact for Pricing pricing. Soniox records 335,647 monthly visits with +2.2% growth and Paid pricing.
Speech-to-text and voice intelligence APIs for developers
One speech AI API for recognition, generation, and translation in 60+ languages
| Dimension / Metric | | |
|---|---|---|
| Official Domain | assemblyai.com | soniox.com |
| Pricing Model | Freemium, Contact for Pricing | Paid |
| Monthly Visits | 453.59K (453,591) | 335.65K (335,647) |
| MoM Traffic Delta | -33.48K (-6.9%) | +7.29K (+2.2%) |
| Primary Market & Share | 🇧🇷 Brazil (30.6%) | 🇺🇸 United States (12.5%) |
| Direct Visits / mo | 281.47K | 181.75K |
| 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.
One speech AI API for recognition, generation, and translation in 60+ languages
Soniox STT delivers high accuracy across 60+ languages, accents, numbers, names, and domain vocabulary, engineered for fast multi-speaker conversations and noisy environments.
Generate expressive speech in 60+ languages with audio tags, alphanumeric accuracy, seamless language switching, 200+ built-in voices, and instant voice cloning.
Translate speech in real time across roughly 3,600 language pairs, with low-latency output that starts before a sentence finishes and handles mid-sentence language switching.
Streaming models transcribe speech and start generating audio from the first few words, keeping interaction fast enough for live voice agents and captions.
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.
Industry leader for high-fidelity speech synthesis and voice cloning, though less focused on raw streaming STT infrastructure.
Industry leader for high-fidelity speech synthesis and voice cloning, though less focused on raw streaming STT infrastructure.
Free / Open-sourceOpen-source voice platform offering studio-grade text-to-speech and instant cloning, suitable for self-hosting deployments.
Free / Open-sourceOpen-source voice platform offering studio-grade text-to-speech and instant cloning, suitable for self-hosting deployments.
SpecialistProvides expressive multilingual text-to-speech and voice cloning APIs with strong performance across global languages.
SpecialistProvides expressive multilingual text-to-speech and voice cloning APIs with strong performance across global languages.
Delivers extremely low-latency real-time text-to-speech and streaming transcription APIs tailored for conversational agents.
Delivers extremely low-latency real-time text-to-speech and streaming transcription APIs tailored for conversational agents.
Provides ultra-fast real-time speech-to-text and voice AI APIs, but with less emphasis on integrated translation.
Provides ultra-fast real-time speech-to-text and voice AI APIs, but with less emphasis on integrated translation.
SpecialistSpecialises in orchestrating conversational voice agents and telephony integrations rather than standalone speech APIs.
SpecialistSpecialises in emotional text-to-speech generation and multilingual video dubbing, but less robust for raw transcription pipelines.
SpecialistSpecialises in emotional text-to-speech generation and multilingual video dubbing, but less robust for raw transcription pipelines.
Focuses on robust real-time audio transcription and advanced audio intelligence features via developer APIs.
Focuses on robust real-time audio transcription and advanced audio intelligence features via developer APIs.
Offers real-time speech-to-text, TTS, and live translation APIs with competitive latency for voice applications.
Offers real-time speech-to-text, TTS, and live translation APIs with competitive latency for voice applications.
SpecialistB2B AI audio models for stem separation, transcription, mastering, and voice processing
SpecialistB2B AI audio models for stem separation, transcription, mastering, and voice processing
SpecialistProvides enterprise-grade audio transcription and speech-to-text APIs tailored for legal and media compliance workflows.
SpecialistProvides enterprise-grade audio transcription and speech-to-text APIs tailored for legal and media compliance workflows.
