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ioDiacritics

Restore stripped Bosnian / Croatian / Serbian diacritics — offline.

Stable · v0.9.3 Swift 5.9+ · C++17 macOS · iOS · Windows · Linux deterministic
Download demo for macOS Add Swift package C++ library

✓ Signed & notarized — opens on any Mac, no Gatekeeper warnings. macOS 13+ · .dmg ≈5.8 MB · all releases. Provided “as is”, without warranty — see terms.

ioDiacritics restores stripped Latin diacritics in Bosnian, Croatian and Serbian text — ć, č, đ, dž, š, ž. Turn citaj sa uzitkom back into čitaj sa užitkom. It's deterministic and AI-free: bundled dictionaries, no ML model, no server, completely offline.

For apps, scripts and text pipelines that need reliable citaj → čitaj restoration without calling an API — drop in the library and ship.

The macOS demo app: stripped text on the left, restored diacritics on the right with changed words highlighted.
The SwiftUI demo app — paste stripped text, restore, and see changed words highlighted.

Two libraries, one engine

  • A SwiftPM package for macOS and iOS (Swift 5.9+).
  • A portable C++17 library for Windows, Linux and macOS.
  • Same engine, dictionaries and quality metrics across both.

Measured quality

  • Three language packs — Bosnian 94.9% recall, Croatian 96.1%, Serbian 93.7%.
  • ~99.5–100% edit precision: it rarely changes a word it shouldn't.
  • Montenegrin covered in compatibility mode.
  • Validated on 10,000+ documents using bootstrap confidence intervals.

Demo apps

The ioDiacritics-Demos repository ships three self-contained showcases that link the same engine: a SwiftUI desktop app for macOS, a system input method (Šišana — below), and a cross-platform C++ app (Dear ImGui + GLFW + OpenGL3) for Windows, macOS and Linux. Same dictionaries and quality numbers across all three.

⌨️ ioDiacritics Šišana — type with diacritics, anywhere

The newest showcase turns the engine into a macOS input method — a system input source you pick from the keyboard menu, just like a layout. Type bald Latin in any app and the diacritics appear as you go (citaj → čitaj): no window, no copy-paste, no Accessibility permission, fully offline. When a word is genuinely ambiguous it pops a Chinese-style candidate list — casa → časa · čaša · ćasa — so you pick the right reading with a number key, while confident words just restore themselves. It's the most natural way to write šišana Bosnian/Croatian/Serbian: keep typing the easy way and let your text come out correct.

Download Šišana installer Source

✓ Signed & notarized · macOS 13+ · .pkg ≈4.8 MB. Run the installer — choose Install for all users (admin password → system-wide) or Install for me only (no admin). Then add Šišana in System Settings → Keyboard → Input Sources → ＋ (listed under Serbian (Latin)) and pick it from the menu-bar input menu. Provided “as is”, without warranty — see terms.

Also powers diacritics restoration inside PolyType.