Sonic-3 AI: AI Voice Platform - Text to Speech & Speech to Text
Transform text into lifelike speech, transcribe audio to text. 42+ languages, <200ms latency, emotion control. Powered by Cartesia Sonic-3 & ink-whisper.
๐ Bi-directional Voice AI โข ๐ 42+ Languages โข โก <200ms Latency โข ๐ญ 60+ Emotions โข ๐ค Voice Cloning โข ๐ Real-time Voice Changer
Free AI Voice Studio: TTS, STT, Voice Clone & Voice Changer
Transform text to speech, transcribe audio to text, clone voices in 10 seconds, and change your voice in real-time. No signup required.
Why Choose Sonic-3: The Complete AI Voice Platform
TTS + STT: Bi-directional voice AI with 42+ languages, <200ms latency, emotion control, voice cloning, and real-time voice changer
Bi-directional Voice AI
TTS + STT in one platform. Convert text to speech and speech to text seamlessly. The complete solution for all voice applications.
42+ Languages Worldwide
Native-quality voices in 42 languages covering 95% of the global population. From English to Hindi, Japanese to Arabic, Spanish to Korean.
<200ms Ultra-Low Latency
Industry-leading real-time performance. Perfect for live conversations, voice agents, customer service bots, and interactive applications.
60+ Emotion Controls
Fine-tune emotional expressions from excited to sad, calm to urgent. Make your AI voice sound genuinely human with context-aware intonation.
Instant Voice Cloning
Clone any voice with just 10 seconds of audio. Create personalized experiences at scale with your own custom voice.
Real-time Voice Changer
Transform your voice into any character or celebrity in real-time. Speak with anyone's voice instantly using our STT + TTS pipeline.
Speak Every
Language: 42+ Languages with Native Pronunciation
Text to Speech and Speech to Text in over 42 languages. Localize a given voice to any accent or language with native-quality pronunciation.
Use Cases: From Content Creation to Customer Service
Sonic-3 powers voice experiences for customer service, content creation, education, gaming, and accessibility
Customer Service & Support
Build intelligent voice bots that sound empathetic and natural. Handle customer inquiries 24/7 with real-time voice responses. Reduce wait times and improve satisfaction with AI that truly understands context.
Content Creation & Podcasts
Generate professional voiceovers, audiobooks, and podcast narration with emotion control. Create engaging content at scale without voice actors. Perfect for YouTube, podcasts, and digital media.
Education & E-Learning
Transform educational content into natural speech for online courses and language learning. Support students worldwide with multilingual voices that engage and teach effectively.
Gaming & Interactive Media
Create dynamic NPC dialogues with emotional range. Generate thousands of voice lines for characters with excited, calm, or dramatic tones instantly. Bring your game worlds to life.
Accessibility Solutions
Power screen readers, text-to-speech assistants, and navigation apps. Make digital content accessible to visually impaired users with natural, pleasant voices.
More Free AI Voice & Audio Tools
Free online tools for voice changing, audio enhancement, transcription, and subtitle generation. No installation required.
Voice Changer
Transform your voice into any character or celebrity in real-time
Audio Enhancer
Remove background noise and enhance audio to studio quality
MP3 to Text
Convert MP3 audio files to text with high accuracy
Video to Text
Generate accurate transcripts from any video file
Podcast Transcriber
Convert podcast episodes with automatic speaker identification
Subtitle Generator
Create SRT/VTT subtitle files for videos automatically
Trusted by Developers & Businesses Worldwide
Join a growing ecosystem of voice-powered applications built on Sonic-3.
API Calls
100M+
Monthly TTS Generations
Languages
42
Global Language Support
Latency
<200ms
Ultra-Fast Response Time
Simple, Transparent Pricing
Free tier with 10,000 characters/month. Pro and Enterprise plans for growing businesses.
Free
Perfect for testing and small projects
Includes:
- 10,000 characters per month
- 42 languages supported
- All emotion & speed controls
- MP3, WAV, OGG formats
- Community support
- API documentation access
No credit card required
Professional
For growing businesses and developers
Everything in Free, plus:
- 500,000 characters per month
- Priority processing
- Higher rate limits (100 req/min)
- Email support
- Usage analytics dashboard
- Commercial use license
- Version snapshot stability
Best value for production apps
Enterprise
Custom solutions for large-scale applications
Everything in Professional, plus:
- Unlimited characters
- Custom voice training
- Dedicated account manager
- SLA guarantee (99.9% uptime)
- Priority support (24/7)
- Custom rate limits
- Volume discounts
- Private deployment options
Contact us for custom pricing
What Our Users Say
Trusted by developers, content creators, and enterprises worldwide for voice AI solutions
Alex Martinez
AI Product Manager at TechCorp
Sonic-3's emotion control transformed our customer service bot. Customers now report 40% higher satisfaction because the voice sounds genuinely empathetic. The sub-200ms latency means conversations feel natural.
Sophie Nakamura
Lead Developer at EduTech
We built a language learning app with Sonic-3. The 42-language support with native pronunciation is incredibleโour students can hear correct accents in Japanese, Spanish, Arabic, and more. Integration took just 2 days!
James O'Connor
CTO at AudioBooks Plus
Before Sonic-3, we hired voice actors for every audiobook. Now we generate professional narration in minutes with emotion control for dramatic scenes. Production costs dropped 90% while quality stayed excellent.
Priya Sharma
Accessibility Lead at HealthApp
Sonic-3 powers screen reading for our 100K+ visually impaired users. The natural intonation makes long articles pleasant to listen to. Speed control lets users customize their experience perfectly.
Marcus Lin
Game Developer at IndieLabs
Our RPG has thousands of NPC dialogue lines. Sonic-3's emotion tags let us create excited merchants, calm wise characters, and dramatic villainsโall through one API. Players say our voice acting rivals AAA games!
Emma Dubois
Founder of VoiceBot Studio
We've tested every TTS API on the market. Sonic-3 has the best balance of expressiveness, latency, and language support. Enterprise stability with version snapshots gives our clients peace of mind.
Frequently Asked Questions
Common questions about Sonic-3 text-to-speech, speech-to-text, voice cloning, voice changer, and API integration
What is Sonic-3?
Sonic-3 is a comprehensive AI voice platform that provides text-to-speech (TTS), speech-to-text (STT), voice cloning, and voice changer capabilities. Powered by Cartesia's Sonic-3 neural network and ink-whisper engine, it supports 42+ languages with <200ms latency and 60+ emotion controls.
What languages does Sonic-3 support?
Sonic-3 supports 42 languages including English, Chinese, Japanese, Spanish, French, German, Arabic, Hindi, Korean, Italian, Portuguese, Russian, Swedish, Turkish, Polish, Dutch, and 26 more. Each language features native pronunciation and natural accent patterns.
How does Speech to Text (STT) work?
Sonic-3's STT powered by ink-whisper achieves 95%+ accuracy across most languages. Simply upload an audio/video file or record directly, and the AI automatically detects the language, transcribes with word-level timestamps, and supports speaker identification for multi-person conversations. Export to TXT, SRT, or VTT formats.
Can I clone my own voice?
Yes! Upload just 10-30 seconds of clear audio, and Sonic-3 creates a digital clone of your voice within seconds. You can then use this cloned voice for TTS in any of our 42 supported languages. The voice clone maintains your unique vocal characteristics while speaking any text.
How does the Voice Changer work?
The voice changer uses a real-time STT + TTS pipeline. Your voice is first transcribed to text using ink-whisper, then immediately synthesized using a different voice (celebrity, character, or custom clone). The entire process happens in under 500ms for real-time transformation.
How does emotion control work in Sonic-3?
You can control emotion through SSML tags like <emotion value='excited'/> or through API parameters. Sonic-3 supports 60+ emotional tones including excited, calm, neutral, sad, friendly, professional, and more. The model automatically applies appropriate intonation, pace, and vocal characteristics for each emotion.
What is the API latency for real-time applications?
Sonic-3 delivers ultra-low latency streaming with <200ms time-to-first-byte, making it perfect for live customer service, voice assistants, gaming, and interactive experiences. Streaming begins immediately as text is processed.
Is Sonic-3 free to use?
Yes! Sonic-3 offers a free tier with 10,000 characters per month for TTS, access to all 42 languages, and full emotion controls. STT includes free minutes for transcription. No credit card required to start.
What audio formats are supported?
For TTS output: MP3, WAV, and OGG formats with configurable sampling rates (24kHz, 48kHz) and bitrates (128-320kbps). For STT input: MP3, WAV, M4A, FLAC, OGG for audio; MP4, MOV, AVI, MKV, WebM for video. YouTube links are also supported.
Is Sonic-3 suitable for enterprise applications?
Absolutely. Sonic-3 provides enterprise-grade stability with version snapshots, 99.9% uptime SLA, dedicated support, high throughput (1000+ TPS), and compliance with SOC 2, HIPAA, and GDPR. Many Fortune 500 companies trust Sonic-3 for mission-critical voice applications.