Gradio

Gradio is an open-source Python library for developers and data scientists who need to build and share interactive web user interfaces for machine learning models, APIs, or any Python function.

Key capabilities include:

• Fast UI generation with minimal Python code, no JavaScript required, plus 40+ components for text, images, audio, video, code, sliders, dropdowns, webcam, and file uploads
• Built-in queuing to manage concurrent users and resource-intensive workloads, useful for GPU-backed demos and apps
• Real-time streaming for low-latency outputs (for example token-by-token generation) using Python generators and streaming transports (WebRTC/WebSocket and HLS)
• App framework features such as multi-page apps with automatic routing, PWA installability, dynamic interfaces via @gr.render(), and prebuilt ML components like ChatInterface and ImageEditor

Pricing: Free, open source (Apache 2.0).

Gradio stands out by combining demo-friendly sharing links with a fuller web app framework, and by supporting easy hosting on Hugging Face Spaces without requiring a separate DevOps setup.