RaTeX — Rust math layout aligned with KaTeX golden tests

Rust · WASM · NativeTeX-quality math from one Rust layout core RaTeX parses LaTeX math, applies TeX-style rules, and emits a flat display list for CoreGraphics, Skia, Canvas 2D, or your own vector backend—identical output from native FFI and WebAssembly. Alignment: RaTeX is built to match KaTeX where it matters: CI runs large golden suites with pixel diffs against reference images, and on that corpus output is broadly comparable to KaTeX. The support table walks the full golden list side-by-side with KaTeX. Where it fits: for math inside a normal web page, KaTeX in the DOM remains a great default. RaTeX is aimed at native apps, servers, and embeds without a WebView—same engine from mobile to WASM. Try it Packages Integrate anywhere Ready-to-use SDKs and WASM builds ship from the same Rust core: install from npm, Maven, pub.dev, or SPM—step-by-step in Get started. Server-side PNG and CLI are covered there too. Web (WASM) iOS (Swift) Android (Kotlin) Flutter (Dart FFI) React Native Server / CLI npm ratex-wasm / ratex-react-native · Maven io.github.erweixin:ratex-android · pub.dev ratex_flutter · iOS via SPM When to reach for RaTeX Native or server — Ship the same layout on iOS, Android, Flutter, or Rust services (PNG/SVG-style rasterization) without bundling a browser. WASM in your host — Run the core in WebAssembly and draw with Canvas; compare output with KaTeX in the live demo. Chemistry & units — \ce /\pu on the mhchem-style path next to ordinary math (see galleries below). memoryRust core One layout engine, no GC in the hot path: predictable timing for mobile UIs, servers, and CI raster tests. MEMORY_SAFE DISPLAY_LIST devicesShip everywhere C ABI for Swift, Kotlin, Dart, … WASM for the web; tiny-skia or your own rasterizer—identical display lists.

WASM FFI sciencemhchem-style chemistry Built-in \ce and \pu on the mhchem-compatible path—reaction arrows and physical units in the same pipeline as ordinary math. MHCHEM LATEX_MATH Try it in the browser Golden-suite galleries Browse the same LaTeX lines CI uses, rendered with RaTeX WASM on the page: Math, Chemistry, Physics. For side-by-side comparison with KaTeX, open the interactive demo; the full golden suite lives in the support table on the Demo page. Why not a WebView stack? In the browser, KaTeX and MathJax typically run as JavaScript against the DOM. For app shells that embed math via WebView, that still means shipping a browser stack. RaTeX keeps layout and rasterization in Rust for hosts that want to avoid that path. Web stack comparison: RaTeX versus KaTeX and MathJax RaTeX KaTeX (web) MathJax Runtime Pure Rust JavaScript + DOM JavaScript + DOM Mobile Native / WASM WebView WebView Offline Yes Depends Depends JS bundle (typical) 0 kB JS (core is WASM) ~280 kB ~500 kB Memory model Predictable GC / heap GC / heap RaTeX vs native math SDKs Without a WebView, teams often reach for Swift, Objective-C, or Flutter libraries. Below is a high-level comparison with widely used open-source renderers—swiftMath (Swift), flutter_math_fork / flutter_math (Dart / Flutter), and iosMath (iOS)—on chemistry macros, portability, and engine shape. Third-party SDKs evolve independently; compare versions when you integrate.