Powerful voice tools for
modern applications
From text-to-speech synthesis to precision audio alignment and transcription, VocaSync provides production workflow paths that feed into deterministic alignment outputs.
AI Voices
9
Unique personalities
Languages
99
Transcription languages
Formats
5
Audio outputs
Latency
<300ms
Real-time speed
True Forced Alignment
Not ASR. Not guessing. True forced alignment powered by Montreal Forced Aligner—your transcript in, your transcript out. Get word-level timestamps with deterministic precision.
- Your transcript = your output (no hallucinations or omissions)
- G2P handles names, brands, and OOV words automatically
- Deterministic: same input always produces same output
- 15 supported languages with specialized acoustic models
- Phoneme-level alignment for advanced use cases
- Complete bundle: alignment JSON, SRT & WebVTT included
00:00:01,000 --> 00:00:03,500Welcome to VocaSync, your AI voice platform. 00:00:04,000 --> 00:00:07,200Generate natural speech and perfect subtitles.Performance
Measured, not estimated
Real benchmarks from production workloads. Our alignment pipeline is built for speed without sacrificing accuracy.
Alignment Speed
~12×
Faster than realtime
Example Run
66 min
Aligned in just 5.6 min
Start Latency
<5s
Queue to processing
Throughput
1000+
Audio min/hour per node
Benchmarks measured on long-form English narration (66 min audiobook chapter). Performance may vary based on audio quality, language, and content complexity.
Text-to-Speech Synthesis
Transform any text into natural, human-like speech using state-of-the-art AI models. Perfect for narration, accessibility, and interactive applications.
- 57 languages supported worldwide
- 9 distinct AI voices with unique personalities
- High Fidelity audio quality option
- 5 output formats: MP3, AAC, OPUS, FLAC, WAV
- Intelligent text chunking for long content
- Batch processing for large-scale generation
Audio Transcription (ASR)
Convert audio to text with state-of-the-art WhisperX AI, then review and edit before generating linked forced alignment outputs.
- 99 languages with auto-detection
- State-of-the-art WhisperX engine
- Segment-level timestamps included
- TXT and JSON output formats
- Large file support up to 100MB
- Transcribe → Review → Align workflow
- Workflow actions are gated to alignment-supported languages
- Original transcription artifacts remain unchanged
{ "segments": [ { "start": 0.0, "end": 3.5, "text": "Welcome to the podcast." }, { "start": 4.0, "end": 7.2, "text": "Today we discuss AI." }] }Plug-and-play integrations
Add Valeon-style word highlighting to your website with zero configuration. Automated synthesis, alignment, and secure hosting—all in one plugin.
WordPress Plugin
Coming Soon- One-click audio for any post or page
- Gutenberg block with live preview
- Secure CDN hosting for audio artifacts
- Valeon-style word highlighting toggle
Voice Library
9 unique AI voices for every scenario
Each voice has its own personality and tone. From warm and friendly to authoritative and professional—find the perfect voice for your content.
Global Reach
Worldwide language coverage
57 languages for speech synthesis—speak to the world. 15 languages for forced alignment with word-level precision:
Output Formats
5 audio formats for every use case
From compressed streaming formats to lossless studio quality—export in the format that fits your workflow.
| Format | Type | Best For | File Size |
|---|---|---|---|
| MP3 | Lossy | Universal compatibility, web playback | Small |
| AAC | Lossy | Apple devices, mobile apps | Small |
| OPUS | Lossy | Web streaming, real-time applications | Smallest |
| FLAC | Lossless | Archival, professional editing | Medium |
| WAV | Uncompressed | Studio production, maximum quality | Large |
Developer Experience
API-first design for seamless integration
Our REST API is designed for developers. Simple HTTP endpoints, clear documentation, and predictable responses. Integrate VocaSync into any application in minutes.
REST API
Standard HTTP endpoints
Bearer Auth
Simple token authentication
OpenAPI Spec
Full API documentation
Webhooks
Real-time notifications
// Text-to-Speech Synthesisconst response = await fetch("https://api.vocasync.io/v1/synthesis", { method: "POST", headers: { "Authorization": "Bearer voca_your_api_key", "Content-Type": "application/json" }, body: JSON.stringify({ text: "Hello, welcome to VocaSync!", voice: "nova", format: "mp3" })});const audioBlob = await response.blob();More Features
Built for production workloads
Real-time Dashboard
Monitor usage, costs, and performance in real-time with our intuitive dashboard.
Project Organization
Organize your work into projects with metadata, tags, and easy search.
Persistent Storage
Your files are stored until you delete them. No automatic expiry.
Secure Infrastructure
All data encrypted in transit and at rest. Files stored until you delete them.
Usage Analytics
Detailed analytics on API usage, voice distribution, and cost breakdown.
Priority Support
Email support with fast response times for all paying customers.
Ready to add voice to your app?
Start with our free tier—add a payment method to unlock. Upgrade when you need more.