Designing Multilingual Font Packs for Learning Apps

Designing Multilingual Font Packs for Learning Apps

Language products often look fine in one script and broken in another because typography decisions were made too late. Fonts are a product system decision, not a cosmetic detail.

Step 1: Build a script-to-font manifest

{
  "latin": "Inter",
  "hiragana": "Noto Sans JP",
  "han_simplified": "Noto Sans SC"
}

Step 2: Add fallback chains per script class

.text-han { font-family: "Noto Sans SC", "PingFang SC", sans-serif; }
.text-jp  { font-family: "Noto Sans JP", "Hiragino Kaku Gothic ProN", sans-serif; }

Step 3: Measure line-height and clipping in snapshots

assertNoClip(renderTextSample("語彙トレーニング", "text-jp"));

Pitfalls

• One global line-height for all scripts.
• No fallback for rare glyphs.
• Manual visual checks instead of automated snapshots.

Validation

• All supported scripts render without clipping at target sizes.
• Fallback behavior is deterministic between iOS versions.
• Snapshot tests cover key lesson templates.