Inspect what your fonts can actually render.
Mapleglyph reads a font file and tells you which Unicode blocks and codepoints it really covers — no guessing from the file name. Preview glyphs in the terminal and diff coverage between two fonts.
Why
I kept shipping a UI where a few characters fell back to a different font — box-drawing here, a stray ẞ there — because the “regular” weight quietly didn't include them. Checking by eye in a font viewer is slow and easy to get wrong. Mapleglyph answers one question fast: given this file, can it draw these codepoints, yes or no?
A quick look
$ mapleglyph coverage Inter-Regular.ttf
file Inter-Regular.ttf (sfnt, 2,548 glyphs)
Basic Latin 95/95 100%
Latin-1 Supplement 96/96 100%
Latin Extended-A 128/128 100%
General Punctuation 78/111 70%
Currency Symbols 6/33 18%
Box Drawing 0/128 0%
— 7 more blocks with partial coverage (use --all)Coverage by block
Group the font's codepoints into Unicode blocks and show how complete each one is, highest-first.
Terminal preview
Render any range as a grid of glyphs using your terminal's own font, so you can see what's there.
Coverage diff
Compare two files and list exactly which codepoints one has and the other is missing.
Missing-for-text
Feed it a text sample and it reports every character the font can't draw, with line numbers.
Install
# with cargo
cargo install mapleglyph
# or Homebrew
brew install mapleglyph/tap/mapleglyphPrebuilt binaries for Linux, macOS and Windows are attached to each release. Reads TTF, OTF, TTC and WOFF2.