Tidy launches private grammar fixes system-wide

Tidy targets the copy-paste friction that makes lightweight writing edits surprisingly disruptive. Its privacy and no-cost positioning are compelling, but the macOS 26 and Apple Intelligence requirement limits its reach.

• –In-place replacement across apps makes Tidy more useful than browser-bound writing assistants.
• –On-device processing is a meaningful privacy advantage for sensitive work.
• –The anti-AI-slop mode gives Tidy a sharper hook than generic grammar correction.
• –Preserving structured text such as @mentions, dates, and times shows welcome attention to real workflows.
• –The system-wide Mac writing category is already competitive, with products such as Write Lint and WunderType, so reliability and edit restraint will matter more than novelty.