Gradio

Python library for building quick web demos of ML models

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What is Gradio?

Gradio is an open-source Python library, originally from Hugging Face, for wrapping a function in a browser interface with a few lines of code. You describe inputs and outputs - text boxes, images, audio, files, chat - and Gradio renders the UI, handles uploads and can expose the app as an API. It is the default way researchers publish a model demo on Hugging Face Spaces, and it works for any Python function, not only ML. The differentiator is speed: a working, shareable interface in minutes, with no front-end work and no JavaScript.

Last updated: 2026-09-20. This site only provides an index; for exact features, pricing, and licensing, see the official website.

Key features

Interface components for text, image, audio, video, file and chat
Blocks API for composing custom multi-step layouts
One-line share links and free hosting on Hugging Face Spaces
Automatic REST and Python client generated for every app
Streaming output and queueing for long-running generations
Mounts inside FastAPI services for production deployment

Pros & cons

Strengths

Turns a Python function into a web interface in a handful of lines
Free and open source with a very large library of examples
Output works as a shareable link or an embeddable API endpoint

Watch out for

Not a general-purpose framework for polished products
Styling control is limited compared with hand-built front ends
Heavy traffic still needs your own scaling and monitoring

Best for & use cases

model demos, research prototypes, internal tools, hugging face spaces

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FAQ

Do I need to know web development?

No. You describe inputs and outputs in Python and Gradio builds the interface, handles file uploads and serves the page. Anything beyond basic layouts may still need some CSS or front-end work.

Can Gradio apps be used in production?

They can. Every app exposes an API and can be mounted inside a FastAPI service. For heavy traffic you still need to handle scaling, queues and monitoring yourself, or use Hugging Face Spaces hardware.

Is Gradio free?

The library is open source and free to use, including commercially. Free hosting on Hugging Face Spaces comes with CPU limits, and faster hardware is a paid upgrade.