AI Grammatic
Write like a native speaker, in any Mac app.
About AI Grammatic
AI Grammatic is a macOS writing assistant for people who write in a second language. You select text in any Mac app, press Cmd+Option+E, and about a second later the selection is replaced with a version that reads the way a native speaker would put it. It handles grammar, tone and translation through the same shortcut, so there is no copying text into a chat window and pasting the answer back. The problem it targets sits beyond ordinary grammar checking: sentences that are technically correct but sound translated, such as word-for-word phrasing, stiff formal wording, the wrong preposition or a missing article.
The app runs through a system-wide shortcut rather than per-app plugins, so it works anywhere text can be selected and pasted, from Slack, Mail and Notion to a code editor or browser. It keeps your meaning, names, numbers, links and emoji, and Cmd+Z restores the original. The AI is included in the subscription, with no API key needed, and you can choose the model provider in Settings: OpenAI, Anthropic Claude, Google Gemini or DeepSeek. AI Grammatic is a direct download signed and notarized by Apple rather than a Mac App Store app, because it needs macOS Accessibility access that the App Store sandbox does not allow. It is made by BLV Group and requires macOS 14 or later. Since October 25, 2026 it is sold as a single plan, monthly or yearly, starting with a 7-day free trial.
Download the app for Mac and follow the setup guide, which explains the Accessibility permission and lets you try the shortcut inside the setup window before using it elsewhere. Starting the 7-day trial takes a card at checkout, and the license key can be pasted straight into the setup guide.
From then on the workflow is three steps. First, select the text you want to improve in Slack, Mail, Notion, a browser or any other app. Second, press Cmd+Option+E, or the shortcut you assigned to a particular language; add Shift to the shortcut for a formal version instead of a casual one. Third, the rewritten text replaces your selection in place, with a small note next to the pointer showing that the rewrite is running and then done. If you do not like the result, Cmd+Z brings back what you wrote.
The selected text and your settings are sent over an encrypted connection to AI Grammatic's server, which forwards them to the AI provider you picked and returns the result; the vendor says the text is not stored. In a terminal, the rewrite goes to your clipboard instead of being typed at the prompt, and your clipboard is put back the way it was after a rewrite. Without an active trial or subscription, the shortcut offers the trial instead of rewriting.
- •One shortcut, every app - A global shortcut works wherever you can select text and paste, including Slack, Mail, Gmail, Outlook, Notion, Linear, Jira, Messages, WhatsApp, Telegram, Teams, Figma, VS Code, Xcode, Safari, Chrome and Arc.
- •Natural phrasing, not just corrections - Rewrites fix grammar and also smooth wording that is correct but sounds translated, while keeping meaning, names, numbers, links and emoji intact.
- •Per-language shortcuts and translation - Give each of the 30+ supported languages, including English (US and UK), German, Spanish, French, Japanese and Chinese, its own shortcut. Write in one language and get natural text in another as you go.
- •Casual and formal tones - The plain shortcut produces a casual rewrite; adding Shift produces a formal one, so the same draft can go to a teammate or to your manager.
- •Choice of AI model - The AI is included, so no API key is needed. Pick the provider (OpenAI, Claude, Gemini or DeepSeek) in Settings and choose among the models offered for it.
- •Custom writing instructions and generous limits - Add your own writing instructions to steer rewrites. The plan allows 50,000 words a day, counting both the selected words and the rewrite, and resets daily.
AI Grammatic is aimed at non-native English speakers who write at work every day and want their messages to sound natural rather than translated. Developers can tidy pull request descriptions, commit messages and tickets without leaving their editor or issue tracker. Anyone who lives in Slack or email can fix a message before sending it, switching to the formal tone for a client or a manager with one extra key.
People who work across several languages benefit from assigning a shortcut per language, for example writing in Russian and getting natural English, or writing in English and getting German. Teams and individuals who already use Apple Writing Tools or Grammarly for error checking may find it useful as a rewriting layer focused on second-language phrasing and model choice. It is made for macOS and requires macOS 14 or later, and it needs Accessibility access to work across apps.
