About
Charm is a native macOS menu bar app that corrects your spelling, fixes your grammar, and predicts your next word in every app on your Mac. No separate window, no copy-paste, no browser extension.
It is built around three features:
Spells - Real-time spelling correction. Catches typos as you type. Goes beyond macOS's built-in autocorrect by using a local language model that understands context.
Polish - Sentence-level grammar correction. Fixes punctuation, capitalisation, and awkward phrasing the moment you finish a sentence. Works across every Mac app, not just inside the browser like Grammarly.
Oracle - Contextual next-word prediction. macOS has predictive text on iOS but not on desktop. Oracle fills the gap: Tab accepts the suggested next word.
Plus a few extras:
Personal dictionary for proper nouns and technical terms.
Text replacements ("btw" expands to "by the way") system-wide.
Emoji shortcuts ("heart" becomes ??) in any app.
Customisable correction glow colour.
What sets Charm apart:
Fully private by default. Every correction runs on-device using a local language model (Gemma 2 2B or Qwen 2.5 3B). Your keystrokes never leave your Mac.
$9.99 one-time purchase. No subscription, no account, no email signup. Compare to Grammarly Premium at around $144/year.
Native Swift / SwiftUI app. Integrates with macOS dark mode, system keyboard shortcuts, and per-app permissions.
A clean alternative to Grammarly, LanguageTool, ProWritingAid, Apple Intelligence Writing Tools, and the built-in macOS autocorrect.