Discourse Math

Customization Plugin
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I see a new tool, RaTeX,
written in Rust, 100% compatible with Katex.

GitHub - erweixin/RaTeX: >99.5% KaTeX syntax coverage. LaTeX math renderer in pure Rust. No JavaScript, no WebView, no DOM. One Rust core → iOS, Android, Flutter, Web, PNG. C ABI · WASM · Server-side PNG/SVG. · GitHub

It might be a good substitute.