ONNX Runtime Web
Run ONNX models directly in web browsers with this JavaScript library.
Pricing
Free tier
Flat rate
Adoption
↗RisingLicense
Open Source
Data freshness
Verified · Jul 15, 2026Overview
What is ONNX Runtime Web?
ONNX Runtime Web is a JavaScript library that enables running ONNX models on the browser, facilitating machine learning inference without server-side dependencies. It's ideal for developers looking to deploy AI models directly within web applications.
Key differentiator
“ONNX Runtime Web stands out as the only JavaScript library enabling direct ONNX model execution in web browsers, offering unparalleled flexibility and performance for client-side machine learning applications.”
Capability profile
Capability Radar
Honest assessment
Strengths & Weaknesses
↑ Strengths
↓ Weaknesses
Not all ONNX operators are supported, limiting the types of models that can be run in the browser.
WebAssembly compilation and execution overhead can lead to slower inference times compared to native environments for large or complex ONNX models.
Requires manual configuration of Webpack, Babel, and other build tools to properly include and run ONNX Runtime Web in a project.
The official documentation focuses mainly on basic usage scenarios and lacks detailed guides for more complex integrations or optimizations.
Fit analysis
Who is it for?
✓ Best for
Developers building web applications with machine learning capabilities who need to perform model inference on the client side.
Teams working on interactive AI applications that require fast response times and minimal latency.
Projects aiming for offline or low-bandwidth scenarios where server-side dependencies are not feasible.
✕ Not a fit for
Applications requiring real-time streaming of large datasets, as it is optimized for model inference rather than data processing.
Scenarios with strict security requirements that cannot be met by client-side execution of models.
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
Alternatives
Works well with
Next step
Get Started with ONNX Runtime Web
Step-by-step setup guide with code examples and common gotchas.