# KaTeX

11 Hacker News commenters recommended KaTeX and 6 criticized it, November 2025 to November 2026. It was recommended in 3 of 13 months.

**Verdict:** Fast, lightweight library for rendering LaTeX math on web pages and server-side, with MathML included for accessibility. Critics say it lacks features for serious mathematical exposition.

## Why people recommend it

- Fast, lightweight rendering (2 comments): "I use KaTeX for my blog, and indeed KaTeX was faster than MathJax 2" ([source](https://news.ycombinator.com/item?id=45797757)) "It uses KaTeX for fast rendering and it is lightweight." ([source](https://news.ycombinator.com/item?id=47259454))
- Good spacing and rendering quality (2 comments): "Since KaTeX produces the spacing and rendering quality I am happy with, out of the box, I have continued using it." ([source](https://news.ycombinator.com/item?id=45799947)) "the KaTeX output is consistently better" ([source](https://news.ycombinator.com/item?id=48063231))
- Easy to integrate into pages (2 comments): "KaTeX makes an acceptable (to some) compromise by packaging this stuff up in a form where it can be run server side and is easy to integrate on a simple web page" ([source](https://news.ycombinator.com/item?id=45797814)) "It was easy enough to hook into pulldown_cmark, so that $ and $$ and render a decent subset of LaTeX." ([source](https://news.ycombinator.com/item?id=45798184))

## What people warn about

- Slow or failing on large documents (2 comments): ""Page complete" never stops with either library for me. It just keeps counting milliseconds." ([source](https://news.ycombinator.com/item?id=45807961)) "very unstable, frequently failing at rendering large documents with many equations" ([source](https://news.ycombinator.com/item?id=45825321))

## Alternatives hackers recommend

- [MathJax](https://hackerapproved.com/p/mathjax.md): 12 recommend
- [RaTeX](https://hackerapproved.com/p/ratex.md): 9 recommend

## Cite as

Hacker Approved, "KaTeX", https://hackerapproved.com/p/katex/ (counts from 1,795,640 Hacker News comments, November 2025 to November 2026).