GeeksforGeeks vs MDN Web Docs in 2026

Q: Is AnatomyOf free and open source?

AnatomyOf is free, with no account and no paid plan . It is open source under the MIT License . It shows example source files with color-coded callouts linked to the exact lines they explain . Hovering a callout highlights its code .

Q: How do you install AnatomyOf?

There is nothing to install . You open it in any reasonably current desktop or mobile browser . If you want to run a copy on your own computer, use bun install and then bun run dev . It also works on phones, where you tap to pin a callout .

GeeksforGeeks and MDN Web Docs compared on what each covers, what each costs and how each is used, with AnatomyOf as a third option for annotated code.

By SayDeploy · 2026-10-30

SayDeploy is published by LunarWerx, which makes some of the tools compared here.

GeeksforGeeks, MDN Web Docs and AnatomyOf are compared here on what each covers, what each costs, how each starts and what to check before you pick one. GeeksforGeeks lists a System Design course on high-level design, scalability and distributed systems ^[1], and MDN Web Docs has core learning modules with tutorials covering JavaScript fundamentals ^[2]. AnatomyOf shows example source files with color-coded callouts linked to the exact lines they explain ^[3], and it is free ^[3].

Option	What it covers	Price	Account	Install
GeeksforGeeks	Courses, such as a System Design course on high-level design, scalability and distributed systems ^[1]	not published	not published	not published
MDN Web Docs	Documentation of CSS, HTML and JavaScript, since 2005 ^[4]	not published	not published	not published
AnatomyOf	Example source files with color-coded callouts linked to the lines they explain ^[3]	Free, with no account and no paid plan ^[3]	No account needed ^[3]	Nothing to install ^[3]

The short answer

GeeksforGeeks offers courses, one of them a System Design course on high-level design, scalability and distributed systems ^[1].

MDN Web Docs has core learning modules with tutorials covering JavaScript fundamentals ^[2].

AnatomyOf shows example source files with color-coded callouts linked to the exact lines they explain ^[3]. It is free, with no account ^[3].

If you want a system design course, GeeksforGeeks's sources list one ^[1]. If you want tutorials on JavaScript fundamentals, MDN's sources describe its core learning modules ^[2]. If you want example code where each note is tied to the lines it explains, AnatomyOf does that ^[3].

What GeeksforGeeks and MDN Web Docs are built for

GeeksforGeeks is published by Sanchhaya Education Private Limited ^[1]. Its pages list a System Design course on high-level design, scalability and distributed systems ^[1]. It also offers corporate solutions and a campus training program ^[1].

MDN Web Docs has core learning modules that include tutorials covering JavaScript fundamentals ^[2]. Its content is available in several languages, including German, Spanish, French, Japanese, Korean, Portuguese, Russian and Chinese ^[2]. Its content is available under a Creative Commons license ^[4].

For anything more about either site, check its own pages.

What AnatomyOf is built for

AnatomyOf is made by the team that publishes this site.

It shows an example source file with color-coded callouts linked to the exact lines they explain ^[3]. Hovering a callout highlights its code, and clicking it opens a longer writeup ^[3]. Each language has a minimal and a verbose example, and switching between them animates only the lines that change ^[3]. The same annotated format extends to non-code concepts such as an email and a CI pipeline ^[3]. Some entries have a third Visual tab with diagrams generated from data, linked to the same annotations ^[3].

The language list is sorted by TIOBE Index rank, can be switched to A-Z, and has instant search ^[3]. Code is highlighted with Shiki, the engine VS Code uses ^[3]. Entries have addresses you can share, so a link can open one directly ^[3]. It has light and dark themes and works on phones, where you tap to pin a callout ^[3]. Adding a language means writing one file that describes it ^[3].

Pricing and fees

No price for GeeksforGeeks is published in the facts here, so none is given. Its System Design course is listed ^[1], but its cost is not published.

No price or fee for MDN Web Docs is published in the facts here.

AnatomyOf is free, with no account and no paid plan ^[3]. It is open source under the MIT License ^[3].

Setting it up and daily use

There is nothing to install to use AnatomyOf in a browser ^[3]. To run it locally on your own computer, use bun install and then bun run dev ^[3]. It runs in any reasonably current desktop or mobile browser ^[3]. To run a copy on your own computer, use bun install and then bun run dev ^[3].

Day to day, you pick a language from the sorted list ^[3]. Then you switch between its minimal and verbose examples ^[3].

For setup and daily use of GeeksforGeeks and MDN Web Docs, check each site's own pages.

Things to check before you choose

Ask which kind of learning you want: a structured course, tutorials, or annotated examples to read. GeeksforGeeks's sources list a course on system design ^[1], MDN's learning modules cover JavaScript fundamentals ^[2], and AnatomyOf shows annotated examples ^[3].

Check the cost of any GeeksforGeeks course on its own pages, since no price for it is published in the facts here.

Check the license before you reuse anything. MDN's content is available under a Creative Commons license ^[4], and AnatomyOf is open source under the MIT License ^[3].

Check what data leaves your machine. AnatomyOf sends one anonymous visit ping per browser session on page load, and its README says it collects anonymous usage statistics ^[3]. For the other two, check each site's own pages on data handling.

Check that the languages you use appear in the list. The language list can be sorted and searched ^[3].

How to choose

If you want a system design course on high-level design, scalability and distributed systems, GeeksforGeeks's sources list one ^[1].

If you want tutorials on JavaScript fundamentals, MDN's core learning modules cover them ^[2].

If you want example code where each note is tied to the lines it explains, AnatomyOf does that ^[3].

If cost and sign-up matter, AnatomyOf is free and needs no account ^[3].

Frequently asked questions

Is GeeksforGeeks free to use?

No price for GeeksforGeeks is published in the facts here, so no price is given. Its pages list a System Design course on high-level design, scalability and distributed systems ^[1], and the cost of that course is not published in the facts here. Check the course page on GeeksforGeeks before you sign up, and read any account terms there as well.

Is MDN Web Docs free to use?

No price or fee for MDN Web Docs is published in the facts here. Its content is available under a Creative Commons license ^[4], and its core learning modules include tutorials covering JavaScript fundamentals ^[2]. Check the site's own pages for current terms of use before you rely on it for a project.

Is AnatomyOf free and open source?

AnatomyOf is free, with no account and no paid plan ^[3]. It is open source under the MIT License ^[3]. It shows example source files with color-coded callouts linked to the exact lines they explain ^[3]. Hovering a callout highlights its code ^[3].

How do you install AnatomyOf?

There is nothing to install ^[3]. You open it in any reasonably current desktop or mobile browser ^[3]. If you want to run a copy on your own computer, use bun install and then bun run dev ^[3]. It also works on phones, where you tap to pin a callout ^[3].

Does AnatomyOf collect data about visitors?

AnatomyOf sends one anonymous visit ping per browser session on page load ^[3]. Its README says it collects anonymous usage statistics ^[3]. For GeeksforGeeks and MDN Web Docs, check each site's own pages about data handling before you sign up or rely on either one for work.

AnatomyOf is free, with no account and no paid tier. ^[3]

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