kokoro-js
High-quality text-to-speech for the web with Apache-2.0 license.
Pricing
Free tier
Flat rate
Adoption
↘CoolingLicense
Open Source
Data freshness
Aging · Jun 8, 2026Overview
What is kokoro-js?
Kokoro.js is a high-quality text-to-speech library designed specifically for web applications, offering developers an easy way to integrate speech synthesis capabilities into their projects under the permissive Apache-2.0 license.
Key differentiator
“Kokoro.js stands out as an open-source, high-quality text-to-speech library specifically tailored for web applications, offering developers a free and easy way to integrate speech synthesis capabilities.”
Capability profile
Capability Radar
Honest assessment
Strengths & Weaknesses
↑ Strengths
↓ Weaknesses
Kokoro.js primarily supports English and lacks robust support for other languages, limiting its global applicability.
The library can struggle with long or complex sentences, leading to slower synthesis times and sometimes less natural speech output.
The official documentation is minimal, and the community around Kokoro.js is small, making it difficult for developers to find help or resources.
Kokoro.js relies heavily on Web Audio API which may not be fully supported in all browsers, leading to inconsistent performance across different platforms.
Fit analysis
Who is it for?
✓ Best for
Web developers looking for a high-quality text-to-speech solution under an open-source license
Projects requiring easy integration of speech synthesis capabilities into web applications
✕ Not a fit for
Applications needing real-time voice processing or complex voice interactions beyond basic TTS
Teams that require cloud-hosted services rather than local integrations
Cost structure
Pricing
Free Tier
Available
Open source — free to use
Starts at
$0
Model
Flat rate
Enterprise
None
Performance benchmarks
How Fast Is It?
Ecosystem
Relationships
Next step
Get Started with kokoro-js
Step-by-step setup guide with code examples and common gotchas.