Proofly is a free, open-source Chrome extension that delivers industry-class proofreading by leveraging Chrome's built-in on-device AI, ensuring all text processing occurs locally without any data transmission to the cloud. It provides real-time grammar, spelling, and punctuation checks with a lightweight, non-invasive interface, prioritizing user privacy and offline functionality.
Proofly
Private AI proofreading that runs 100% on your device
Proofly Introduction
Key Features
- Runs 100% locally on your device for total privacy
- No data transmission to the cloud or external servers
- Works offline after initial AI model download
- Free, open-source with no accounts or tracking
- Lightweight and non-invasive UI that respects page focus
Use Cases
- Writers and content creators needing privacy for sensitive drafts or confidential projects
- Students and academics who require offline proofreading for research papers or assignments
- Professionals in legal, healthcare, or business fields seeking secure grammar assistance for emails and documents
- Remote workers or travelers who need reliable proofreading without internet access
Why Startups Use It
Startups need Proofly because it provides a cost-effective, privacy-first tool for enhancing written communication without relying on cloud-based services that may pose data security risks. Its on-device operation reduces internet dependency and protects sensitive business information, such as emails or strategic documents, ensuring compliance and efficiency in fast-paced environments.
Alternative Options
Grammarly, LanguageTool, ProWritingAid, Hemingway Editor
Frequently Asked Questions
Does Proofly require an internet connection to work?
Proofly works completely offline after the initial download of Chrome's built-in AI models, as all processing is done locally on your device.
Is Proofly really free to use?
Yes, Proofly is completely free and open-source, with no hidden fees, subscriptions, or account requirements.
What are the system requirements for Proofly?
Proofly requires Chrome version 141 or higher and a device capable of running Chrome's built-in AI models for optimal performance.
How does Proofly ensure my privacy?
Proofly processes all text locally on your device, so no keystrokes or data are sent to the cloud, ensuring complete privacy and security.
Alternative Tools
More About Proofly
PricingPaid
Platform
Web
Category DescriptionCurated writing, polishing, rewriting, summarization, copywriting, and knowledge expression tools.
Listed DateMar 12, 2026
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