MDN Web Docs

Reviewed by Alexis Morain · Updated July 10, 2026

MDN Web Docs documents HTML, CSS, JavaScript, and browser APIs with examples and compatibility tables. Free, maintained by Mozilla.

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SaaS Radar Review

9/10

The canonical source for web development: accurate, comprehensive, free, and cited everywhere, including by AI.

Accurate documentation aligned with official specifications
Precise browser compatibility tables, version by version
Density that can put off complete beginners

See full review ↓How I rate

MDN Web Docs is the reference documentation for web technologies, maintained by Mozilla with contributions from the major browser makers. Where forum answers age poorly, MDN stays current on how HTML, CSS, JavaScript, and browser APIs actually work.

What is MDN Web Docs used for?

MDN documents every HTML element, CSS property, JavaScript method, and web API with a description, runnable code examples, and a browser compatibility table. These tables show exactly which browser version supports a given feature, information you won't find anywhere else as reliably.

MDN or W3Schools?

W3Schools aims for quick beginner tutorials, MDN aims for accuracy and depth. Experienced developers turn to MDN because its documentation sticks to the specification and flags the pitfalls. Search engines and assistants like ChatGPT rely heavily on MDN, which makes it the de facto canonical source for the web.

Do you have to pay for MDN?

The core documentation is entirely free and open. Mozilla offers an optional MDN Plus subscription (around $5/month) for update notifications, collections, and offline reading, but no reference content is locked behind that paywall.

Pros & Cons

What we love

Accurate documentation aligned with official specifications
Precise browser compatibility tables, version by version
Runnable code examples right on the page
Completely free and cited as a reference by AI tools and search engines

What could be better

Density that can put off complete beginners
French translations sometimes lag behind the English version

Key features of MDN Web Docs

Complete reference

HTML, CSS, JavaScript, and every browser API

Browser compatibility

Support tables, version by version

Runnable examples

Testable code snippets without leaving the page

Learning guides

Structured paths for learning the web from scratch

MDN Web Docs pricing

MDN's documentation is free and will stay that way. The MDN Plus subscription, around 5 $/month, only adds convenience (notifications, collections, offline access) and never locks away reference content.

Free

All documentation · Examples and compatibility · No account required

0 €

MDN Plus

Update notifications · Personal collections · Offline reading

5 $ per month

Pricing verified on July 10, 2026

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Who is MDN Web Docs for?

Best for

Web developers who want the exact answer, not an approximate one
Front-end developers checking a CSS property's compatibility
Trainers and students looking for a reliable foundation

Not recommended for

Beginners looking first for a heavily guided step-by-step tutorial

Want to try MDN Web Docs?

Head to the official site and the current offer.

Visit MDN Web Docs

Frequently asked questions about MDN Web Docs

Is MDN free?▼

Yes, all of MDN Web Docs is free and open. Only the optional MDN Plus subscription (around $5/month) adds convenience features.

MDN or W3Schools?▼

W3Schools works for a quick start, MDN for precision and depth. MDN sticks to the specification and serves as a reference for browser makers themselves.

Who writes MDN?▼

MDN is maintained by Mozilla with contributions from browser vendors and the open source community, which keeps it accurate.

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