Text-to-speech API for e-learning, training, and AI tutors
Build multilingual course authoring tools, learning platforms, language apps, and AI tutors with Soniox Text-to-Speech API. Generate speech across 60+ languages and stream responses in real time for natural, responsive learning experiences. Pair with Soniox Speech-to-Text API for two-way voice interaction.
$0.70 per generated hour.
Trusted by teams building global voice products
Text-to-speech built for learning products
Learning content changes constantly. New lessons, updated material, new markets, and interactive experiences all need speech that can be generated programmatically. Soniox Text-to-Speech API gives learning platforms one voice layer for course narration, language practice, AI tutoring, and training.
Localize courses across 60+ languages
Every built-in and cloned Soniox voice speaks all 60+ supported languages. Build multilingual course experiences while keeping the same instructor or brand voice across every localized version.
Build bilingual language-learning experiences
Mix the learner’s language with the language they are studying in one utterance. Soniox switches languages naturally, while character-level timestamps let your app synchronize speech with vocabulary, captions, and read-along text.
Your reservation is confirmed. Cuando llegues al hotel, muestra este código en recepción: ES-4928.
The meeting has been moved to Tuesday. Merci de confirmer votre disponibilité avant la fin de la journée.
To enable the new feature, open Settings and select 음성 복제, then tap Continue.
Your order is ready for pickup. 店頭で注文番号 A-7392 をお見せください.
Your payment was received. O recibo foi enviado para o seu endereço de e-mail.
Your table is reserved for seven o’clock. Ko pridete, povejte ime Novak na recepciji.
Pronounce specialized terms correctly
Build narration for medicine, science, law, finance, engineering, and other specialist subjects with accurate pronunciation of technical terminology, names, numbers, and domain-specific language.
Clone instructor and brand voices
Create a voice from a short recording of an instructor, expert, presenter, or approved brand voice, then use that identity consistently across courses, modules, and languages.
Stream responses for real-time AI tutors
Stream text from your tutor’s language model and begin playback before the full answer is generated, reducing the delay between a learner finishing their turn and hearing the tutor respond.
Build complete voice learning experiences
Pair Soniox Text-to-Speech API with Soniox Speech-to-Text API so learners can speak naturally, your application can understand what they said, and they can hear an immediate spoken response. Build conversational tutors, speaking practice, role-play, and interactive language learning with both sides of the voice experience.
Listen
Send learner speech to Soniox Speech-to-Text API and receive the transcript your tutoring or learning logic needs.
Respond
Pass the transcript to your language model, tutor logic, or learning system to generate the next response.
Speak
Stream the response through Soniox Text-to-Speech API so the learner hears natural speech without waiting for the complete answer.
Create realistic role-play scenarios
Use audio tags to control emotion, pace, volume, pitch, and delivery line by line, so training products can simulate frustrated customers, anxious patients, hesitant colleagues, or other realistic interactions.
From lesson content to generated speech
Build a narration pipeline that turns course content into synchronized audio and regenerates it whenever the underlying lesson changes.
Author
Take lesson scripts, slide notes, reading material, or dynamically generated text from your authoring tool, LMS, or application.
Configure
Select a built-in or cloned voice and add audio tags wherever the lesson, character, or scenario needs a specific emotion, pace, or delivery.
Generate
Use the REST API for generated lesson audio or the WebSocket API to stream speech progressively for AI tutors and interactive experiences.
Deliver
Play generated audio inside your product and use character-level timestamps to synchronize captions, slides, vocabulary, and read-along highlighting.
Text-to-speech API features for learning products
Build course narration and spoken learning experiences with programmatic control over generation, synchronization, voice identity, and delivery.
Real-time speech generation
Send text in small chunks as it becomes available and receive audio without waiting for the complete input. Built for AI tutors, conversational learning, and interactive lessons.
Explore real-time generationCharacter-level timestamps
Receive start and end times for every spoken character so your application can synchronize highlighting, captions, slides, vocabulary, and other learning interfaces with the audio.
Explore timestampsVoice cloning
Create an instructor or brand voice from a reference clip in Soniox Console or through the API, then use its voice ID like any built-in voice across every supported language.
Explore voice cloningAudio tags
Control emotion, volume, pace, and pitch inline with tags like [calm], [slowly], or [annoyed]. Tags are written in English regardless of the generated language.
Speech infrastructure for massive scale
Build on one API and deploy in your region
Use the same models and API everywhere, with in-region processing to meet latency, data residency, and regulatory requirements.
Available: US, EU, Japan, India
Coming soon: Korea, Australia, Canada, Saudi Arabia, UK, Brazil
Run mission-critical systems with confidence
- 99.9% uptime
Production-hardened infrastructure with monitoring and redundancy. - low-latency streaming
Process speech in real time with low latency for responsive voice applications. - Priority support
Severity-based incident response with direct access to the Soniox team.
"Before Soniox, our international users always had a noticeably different experience. Now accuracy and responsiveness match across all regions…it feels like one system instead of five."
Alon Yair CTO of Onvego
Build voice into every learning product
Add narration and spoken interaction to course authoring tools, learning management systems, language apps, AI tutors, corporate training platforms, and interactive simulations.
Course authoring tools
Add voice generation directly to authoring workflows so instructional designers can create and update narration whenever lesson content changes.
Learning management systems
Add narrated lessons, audio versions of reading material, and multilingual course audio across your LMS and course catalog.
Language learning apps
Generate vocabulary, dialogues, bilingual explanations, and speaking examples with synchronized text, and pair with speech-to-text for spoken practice.
AI tutors
Combine speech-to-text and streaming text-to-speech to build tutors that listen to learners and respond naturally with voice.
Corporate training platforms
Add multilingual voice to onboarding, compliance, product training, and workforce learning without maintaining separate recording workflows.
Role-play and scenario training
Build spoken sales, support, healthcare, and soft-skills simulations with characters whose emotion and delivery can be directed line by line.
Privacy and compliance, built right in
Never stored, never saved.
Audio stays in memory, everything is processed in real-time.
Built for privacy-critical use cases.
Adhering to leading global security, privacy, and compliance standards.
Trusted where privacy matters most.
Used in industries where speech is sensitive, from healthcare to enterprise.
Frequently asked questions about text-to-speech APIs for e-learning
How can I add text-to-speech to an e-learning platform?
Send lesson text, course content, or generated responses to Soniox Text-to-Speech API and receive speech your application can play directly inside the learning experience.
Use REST for generated lesson narration or WebSocket streaming for AI tutors, interactive lessons, and other real-time experiences.
Can I build automatic course narration into an LMS or authoring tool?
Yes. Your product can generate narration directly from lesson scripts, slide notes, articles, or other course content.
When the source content changes, your application can regenerate the affected audio programmatically using the same voice.
Can my product generate learning content in multiple languages?
Yes. Soniox Text-to-Speech supports 60+ languages, and every built-in and cloned voice can speak all supported languages.
This lets learning platforms preserve the same instructor or brand voice across localized courses and markets.
Is Soniox suitable for building language learning apps?
Yes. Soniox can switch naturally between languages within the same utterance, making it suitable for bilingual explanations, vocabulary, dialogues, and translation exercises.
Character-level timestamps let your application synchronize spoken audio with text, vocabulary, and read-along highlighting.
Can I build a complete voice AI tutor with Soniox?
Yes. Use Soniox Speech-to-Text API to transcribe what the learner says and Soniox Text-to-Speech API to stream the tutor's spoken response.
Connect both APIs through your language model or tutoring logic to build conversational tutors, speaking practice, role-play, and other two-way voice learning experiences.
Can my product use an instructor's or brand's own voice?
Yes. Create a cloned voice from a short reference recording through Soniox Console or the API and receive a voice ID your application can use like a built-in voice.
The same cloned voice can generate speech across all 60+ supported languages.
Which voices can I offer inside my learning product?
Can I synchronize generated speech with text or slides?
Can I control emotion and delivery in training scenarios?
Yes. Audio tags let your application control emotion, volume, pace, pitch, and vocal delivery directly in the input text.
This is useful for role-play and simulation products that need characters to sound calm, frustrated, hesitant, excited, or otherwise contextually appropriate.
How much does generated speech cost?
Build voice into your learning product
Add course narration, multilingual speech, cloned instructor voices, synchronized text, and real-time AI tutor responses with Soniox Text-to-Speech API. Pair it with Soniox Speech-to-Text API for complete two-way voice experiences.