Soniox

Soniox

Soniox is a speech AI platform offering real-time multilingual speech-to-text, translation, and text-to-speech through one API. Soniox transcribes 60+ languages in real time or from files, handling mixed-language audio, accents, names, and numbers in a single model and switching languages mid-utterance. As of 2026 it streams with sub-200ms latency and also does any-to-any speech translation across those languages. Soniox targets voice agents, live meetings, and call centers, and ships a consumer app alongside the developer API.

Production credibility: Founded 2020 in Foster City, California by Klemen Simonic, who previously worked on AI at Facebook, Google, and Stanford. The platform carries SOC 2 Type 2, ISO 27001:2022, HIPAA, and GDPR compliance with multi-region, data-residency options. Pricing is token-based pay-as-you-go (file transcription around $0.10 per hour), with a weekly free-credit allowance for testing.

Key Features

• Real-time streaming speech-to-text with sub-200ms latency and word-by-word output
• Asynchronous transcription of audio and video files
• 60+ languages with automatic language switching within one utterance
• Any-to-any speech translation across 60+ languages
• Text-to-speech generation and speaker separation
• SOC 2, ISO 27001, HIPAA, and GDPR compliance with data-residency options

Ideal Use Case

Developers building voice agents, live-meeting transcription, and multilingual call-center tools that need accurate real-time speech-to-text and translation across many languages, including audio where speakers switch languages mid-sentence.

How Soniox differentiates

Deepgram and AssemblyAI are the closest developer speech-to-text APIs. Soniox leans into multilingual coverage — 60+ languages for both transcription and any-to-any translation in a single model, including mixed-language audio — where many alternatives are English-first. Combined with sub-200ms streaming and broad compliance certifications, that makes it a fit for global voice products. Soniox is proprietary rather than open source.

FAQ

Q: What is Soniox? A: Soniox is a speech AI platform with real-time and file-based speech-to-text, any-to-any translation, and text-to-speech across 60+ languages through one API, plus a consumer app.

Q: Soniox vs Deepgram? A: Both are developer speech-to-text APIs aimed at real-time voice. Soniox emphasizes multilingual transcription and translation across 60+ languages, including mixed-language audio in one model, where many alternatives are English-first.

Q: Is Soniox open source? A: No — Soniox is a proprietary commercial API and app founded in 2020 by Klemen Simonic, an ex-Facebook and Google AI engineer.

Q: How many languages does Soniox support? A: 60+ languages for both real-time transcription and any-to-any translation, with automatic language switching mid-utterance.

tl;dr

Soniox is a speech AI platform with real-time multilingual speech-to-text, any-to-any translation, and text-to-speech across 60+ languages through one API. Sub-200ms streaming, mixed-language audio, broad compliance. Founded 2020 by an ex-Facebook/Google engineer. A multilingual alternative to Deepgram and AssemblyAI.