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@danielroe.dev, it was great to meet you and climb together! – So about the font subsetting situation: - The current best practice is likely HarfBuzz (HB)’s subsetting API (harfbuzz.github.io/harfbuzz-hb-...), which is written in C++ and has a CLI, hb-subset (harfbuzz.github.io/utilities.ht...).

- Fonts are complicated. Don’t trust naive solutions that are not backed by HB developers. - HB has a WASM-based JS lib, harfbuzzjs (github.com/harfbuzz/har...), which is currently maintained in a quite confusing way and can use some help from professional TS developers (github.com/harfbuzz/har...).

- Likely irrelevant to you, but fyi, the corresponding solution in Python (the font industry’s common language) is maintained by pretty much the same group of developers in fontTools: glyph set subsetting (github.com/fonttools/fo...) + design space subsetting (github.com/fonttools/fo...).