KaTeX
Fewer than 5 people recommend it so far, so there's no written verdict. Here is what commenters said.
Why people recommend it
“the KaTeX output is consistently better”
“Since KaTeX produces the spacing and rendering quality I am happy with”
Show 3 more
“more recently KaTeX, since they get you closer to the typesetting quality of LaTeX compared to MathML”
“It's fast enough for the side preview and supports all the LaTeX commands I need so far.”
“Overall, I am quite happy with the switch from MathJax to KaTeX.”
Caveats and dissent
“doing one of the mainstream Markdown renderers + Katex (LaTeX) + Prism.js”
“MathJax lets you select text more often than KaTeX as far as I can tell”
Often compared with
Who recommends it in their own words
Threads where it came up
- KaTeX – The fastest math typesetting library for the web 12 mentions
- RaTeX: KaTeX-compatible LaTeX rendering engine in pure Rust 2 mentions
- Jektex 0.2.0 – A Jekyll plugin for LaTeX rendering is now ~10x faster 1 mention
- Ask HN: What are you working on? (June 2026) 1 mention
- Ask HN: Do you have a colophon for your personal website? 1 mention
- Show HN: PyMath Preview – preview LaTeX math in Python docstrings inside VS Code 1 mention
Data: katex.json. Quotes are verbatim; the verdict and theme labels are written by a model from these comments, and every clause links to its sources.
All comments 20
“Now, I find all expressions on a page and render them in a single bulk KaTeX call.”
“doing one of the mainstream Markdown renderers + Katex (LaTeX) + Prism.js”
“KaTeX, which I use to pre-render all the math formulas to HTML”
“the KaTeX output is consistently better”
> the size of the rust binary The `render` binary weighed 4.0 MB on disk when I compiled it a few minutes ago. Not sure if that's what you were looking for, but just in case it is, there you go. Here's the logs, if you want: https://gist.github.com/ethmarks/8df92a68c3076ea2f4a5aedba9fefa28
“It uses KaTeX for fast rendering and it is lightweight.”
“usually Math is wrapped with KaTeX [2]”
“Equations Explained Colorfully (KaTeX + Markdown + TypeScript)”
“What benefits does KaTeX provide over MathML which is natively supported by all major browsers”
“MathJax lets you select text more often than KaTeX as far as I can tell”
“We used KaTeX via a React plugin to render math formulas as part of the AI response”
“I had to serve the js bundle to run in the browser.”
“Since KaTeX produces the spacing and rendering quality I am happy with”
“it uses KaTeX under the hood”
“more recently KaTeX, since they get you closer to the typesetting quality of LaTeX compared to MathML”
“It's fast enough for the side preview and supports all the LaTeX commands I need so far.”
“Overall, I am quite happy with the switch from MathJax to KaTeX.”
https://gist.github.com/akar1ngo/7d4ea6e9dfc369526beb75092cbd6cb8
“I've been using katex-rs, a Rust rewrite”
“I use KaTeX for my blog, and indeed KaTeX was faster than MathJax 2”