Proofly

About Proofly

Proofly is a free, open-source browser extension that provides local proofreading as you type. It checks spelling, grammar, punctuation and common usage issues without sending your text to remote servers, and its interface is intentionally lightweight and unobtrusive.

Review

Proofly prioritizes privacy by running its language model entirely on the user's device, so corrections and flags stay local. The extension highlights issues inline and offers concise suggestions, plus a side panel for reviewing multiple items at once. This first public alpha is aimed at users who want solid proofreading while keeping sensitive writing off external servers.

Key Features

• On-device proofreading for spelling, grammar, punctuation, capitalization, prepositions and missing words.
• No accounts, no telemetry, and no text sent to external servers; works offline after the initial model download.
• Lightweight, non-invasive UI that overlays underlines without modifying the page structure.
• Supports standard inputs, textareas and contenteditable fields, with a side panel for bulk review and triage.
• Open-source codebase, so the implementation can be inspected and contributed to by the community.

Pricing and Value

Proofly is offered free and open-source. Its main value lies in providing industry-class proofreading without requiring an account or cloud processing, which is particularly attractive for people who write sensitive material in the browser. Because it runs locally and can work offline after an initial model download, it can reduce privacy concerns and ongoing data transfer costs associated with cloud services.

Pros

• Processes text entirely on-device, keeping content private and confined to the user's machine.
• Free and open-source, enabling transparency and community contributions.
• Lightweight, unobtrusive UI that avoids altering web page layouts.
• Offline capability after the initial model download.
• Concise, inline suggestions that focus on correction rather than lengthy explanations.

Cons

• Still in an early alpha stage, so users may encounter bugs or rough edges.
• The required initial on-device model download can use time, bandwidth, and storage, which may be a barrier for some users.
• Currently available only as a browser extension, so desktop or mobile app alternatives are not provided yet.

Proofly is best suited for writers and professionals who handle confidential or sensitive text in the browser and prefer to keep proofreading local. It's a strong fit for privacy-conscious individuals and organizations that allow limited extensions, while users who need advanced rewriting, tone adjustments, or broader platform support may find the feature set currently limited.