What it is: Turn Python scripts into shareable web apps. No HTML, CSS, or JavaScript needed.

What It Does Best

Zero web dev. Pure Python. Add widgets with single function calls. No frontend knowledge required.

Fast prototyping. Script to app in minutes. Perfect for demos, POCs, internal tools.

ML model deployment. Show model predictions interactively. Upload data, get results, visualize—all in one app.

Key Features

Pure Python: No HTML, CSS, or JavaScript needed

Hot reloading: See changes instantly as you code

Built-in widgets: Sliders, text inputs, file uploaders with one line

Caching: Optimize performance with simple decorators

Components: Extend with custom React components

Pricing

Open source: Free

Community Cloud: Free public apps

Enterprise: Custom pricing (private apps, auth)

When to Use It

✅ Demo ML models to stakeholders

✅ Internal data tools

✅ Prototypes and POCs

✅ Don't know web development

✅ Data science portfolios

When NOT to Use It

❌ Production applications (not designed for scale)

❌ Complex UX requirements (limited customization)

❌ High traffic sites (performance limits)

❌ Need fine-grained control over layout

❌ Multi-page complex applications

Common Use Cases

ML model demos: Interactive model prediction interfaces

Data exploration tools: Quick analysis apps for teams

Internal dashboards: Simple analytics for small teams

POC applications: Fast prototypes to test ideas

Data science portfolios: Showcase projects interactively

Streamlit vs Alternatives

vs Dash: Streamlit faster prototyping; Dash better for production, more control

vs Gradio: Streamlit more flexible; Gradio simpler for ML model interfaces

vs Flask: Streamlit no web dev needed; Flask full control, more complex

Unique Strengths

Simplicity: Fastest Python script to web app

No web dev: Pure Python, zero frontend knowledge needed

Hot reloading: Instant feedback during development

Community: Huge component library and templates

Visit Streamlit →

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