Proofly – Private AI proofreading running entirely on your device

Summary: Proofly is a free, open-source Chrome extension that provides on-device AI proofreading without sending text to the cloud. It detects and corrects spelling, grammar, punctuation, and other writing issues locally, ensuring privacy and offline functionality with a lightweight interface.

What it does

Proofly uses Chrome’s built-in on-device AI to underline and fix writing errors as you type, operating fully offline after the initial model download. It leverages modern web technologies like Web Components and Shadow DOM to overlay corrections without altering the page DOM, supporting inputs, textareas, and contenteditable fields.

Who it's for

It targets users who prioritize privacy in writing, such as developers, founders, lawyers, journalists, therapists, and anyone handling sensitive text in the browser.

Why it matters

Proofly addresses privacy concerns by eliminating cloud data transmission and tracking, providing local AI proofreading that respects user data and browser performance.