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AnatomyOf vs Exercism in 2026

AnatomyOf and Exercism compared on what each does, what each costs, how each is set up and what to check before you pick one for reading or practicing code.

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AnatomyOf shows an example source file with color-coded callouts linked to the exact lines they explain [1]. Exercism has over 8,744 coding exercises, offers 84 programming languages and provides free human mentoring [2][2][2]. Exercism is not-for-profit and free forever [2][2], and AnatomyOf is free with no account and no paid tier [1]. Exercism's page describes coding exercises with free human mentoring [2][2]; AnatomyOf's claims describe annotated example source files [1].

OptionFree to useCost of extrasAccountSet up
Exercism100% free, forever [2]Insiders via a monthly donation of $10 or more [3]; $499 total donation in one chunk or many parts [3]; Premium discontinued [3]not publishedCLI-first [2]
AnatomyOfFree, no account, no paid tier [1]No paid tier is stated; it is free [1]None needed [1]Works in a browser; no download needed [1][1]

The short answer

AnatomyOf shows an example source file with color-coded callouts linked to the exact lines they explain [1]. Exercism has over 8,744 coding exercises, offers 84 programming languages and provides free human mentoring [2][2][2].

Depending on your needs: Exercism's page says it develops fluency in 84 programming languages, is primarily built CLI-first, and is free forever [2][2][2]. AnatomyOf's claims cover showing an example source file with annotated callouts [1], minimal and verbose examples in each language [1], and the same format for non-code concepts such as an email and a CI pipeline [1].

What Exercism is built for

Exercism is an independent, community funded, not-for-profit organisation [2]. Its page says it is fun, effective and 100% free, forever [2].

The site develops fluency in 84 programming languages [2] and offers over 8,744 coding exercises [2]. You can deepen your knowledge with free human mentoring [2].

Exercism is primarily built as a CLI-first tool [2].

Insiders access is available by setting up a regular monthly donation of $10 or more [3], and it cannot be bought [3]. Dark mode is available exclusively for Insiders [3]. Exercism Premium was discontinued in August 2023 [3].

What AnatomyOf is built for

AnatomyOf is made by the team that publishes this site.

It shows an example source file for a language with color-coded callouts linked to the exact lines they explain [1]. Hovering a callout highlights its code, and clicking it opens a longer writeup with a Learn more link [1]. Each language has a minimal and a verbose example, and switching between them animates only the lines that change [1].

The same annotated format extends to non-code concepts such as an email and a CI pipeline [1]. Some entries have a third Visual tab with diagrams generated from data and linked to the same annotations [1]. Code is highlighted with Shiki, the engine VS Code uses [1].

The language list is sorted by TIOBE Index rank, can be switched to A-Z, and has instant search [1]. Entries have shareable URLs [1]. It has light and dark themes and works on phones, where you tap to pin a callout [1].

Pricing and fees

Exercism is 100% free, forever [2]. It is an independent, community funded, not-for-profit organisation [2], and its page says it needs $25,000 in donations each month to become sustainable [3]. Exercism Premium was discontinued in August 2023 [3].

Insiders is not a product you can buy [3]. The easiest way to get Insiders access is a regular monthly donation of $10 or more [3], and Insiders is granted for donating $499 total, in one chunk or many parts [3]. No other dollar price for Exercism is published [3][3].

AnatomyOf is free, with no account and no paid tier [1]. It is open source under the MIT License [1].

Setting it up and daily use

For Exercism, the tool is primarily built as CLI-first [2]. Exercism's setup and routine use are not published here; check its own pages.

AnatomyOf runs in a desktop or mobile browser and needs no download [1][1]. Its Quick start page covers running it locally [1].

A developer opens an entry and reads an example source file with callouts linked to the lines they explain [1], then switches between the minimal and verbose examples, which animates only the lines that change [1]. Hovering a callout highlights its code, and clicking it opens a longer writeup with a Learn more link [1]. On a phone, you tap to pin a callout [1]. Entries have shareable URLs [1].

Things to check before you choose

Ask what you want from the tool: to practice coding across many languages with exercises and mentoring, or to read annotated examples of a language's syntax. Exercism's page describes exercises and mentoring across 84 languages [2][2][2], and AnatomyOf's claims describe annotated example source files [1].

Check how you like to work. Exercism is primarily built as CLI-first [2]; AnatomyOf runs in a browser [1].

Check cost and accounts. Both state no cost for their core use [2][1], while Exercism's Insiders come through donations [3].

Check what data leaves your machine. AnatomyOf sends one anonymous visit ping per browser session on page load and collects anonymous usage statistics per its README [1]. Check Exercism's own pages for its data handling; its data handling is not published here.

Check which languages you need. Exercism's page says it develops fluency in 84 programming languages [2]. AnatomyOf's language list is sorted by TIOBE Index rank, can be switched to A-Z, and has instant search [1].

How to choose

If you want to practice coding with exercises and free human mentoring, Exercism's page describes that [2][2].

If you want to read an example source file with color-coded callouts linked to the exact lines they explain, AnatomyOf's claims describe that [1].

If you want to switch between minimal and verbose examples, AnatomyOf's claims describe that [1].

If you want to work through a command line, Exercism is described as CLI-first [2].

If you want a tool that runs in a browser with nothing to install, AnatomyOf's claims describe that [1][1].

If you want a free tool, Exercism's page says it is 100% free, forever [2], and AnatomyOf is free with no account and no paid tier [1].

Frequently asked questions

Is Exercism free to use?

Exercism is 100% free, forever [2]. It is an independent, community funded, not-for-profit organisation [2], and its page says it needs $25,000 in donations each month to become sustainable [3]. Exercism Premium was discontinued in August 2023 [3]. No other fee for the core site is published.

What do you get with Exercism Insiders and how much does it cost?

Insiders is not a product you can buy [3]. The easiest way to get Insiders access is a regular monthly donation of $10 or more, and Insiders is granted for donating $499 in one chunk or many parts [3][3]. Dark mode is available exclusively for Insiders [3].

Is AnatomyOf free and open source?

AnatomyOf is free, with no account and no paid tier [1]. It is open source under the MIT License [1]. AnatomyOf is free, with no account and no paid tier [1]. Check the project's own pages for any future plans.

How do you install and set up Exercism and AnatomyOf?

Exercism is primarily built as a CLI-first tool [2]. AnatomyOf runs in a desktop or mobile browser and needs no download [1][1]. Its Quick start page covers running it locally [1].

How many languages and exercises does each tool offer?

Exercism's page says it develops fluency in 84 programming languages and offers over 8,744 coding exercises [2][2]. AnatomyOf's claims do not give a count of languages; its language list is sorted by TIOBE Index rank, can be switched to A-Z and has instant search [1].

AnatomyOf is free, with no account and no paid tier. [1]

Try AnatomyOf

Sources

  1. AnatomyOf's own description of itself (the product of this site's publisher)
  2. Exercism, exercism.org, read 2026-10-08
  3. Exercism, exercism.org/insiders, read 2026-10-08

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