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.

Charm

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