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Proofly Review

Proofly systematically audits drafts for ungrounded claims, phantom sources, and internal contradictions, providing a structured screening layer to help users verify AI-generated content before publication.

shipped Sep 4, 2026freemium
Domain rating74
Proofly — product screenshot

Why it matters

1Proofly operates 100% on-device, ensuring data privacy by processing text locally.
2The Chrome extension was launched on Product Hunt around December 2025, leveraging Chrome's built-in Gemini Nano AI.
3It offers industry-class spelling, grammar, and punctuation correction in real-time.
4Proofly is free and open-source, requiring no accounts, tracking, or telemetry.

About Proofly

Business Model
Subscription SaaS
Target Audience
Researchers, academics, analysts, strategists, writers, and publishers

overview

What is Proofly?

Proofly is a private AI proofreading tool developed as a Chrome extension that enables privacy-conscious individuals and organizations to verify AI-generated content and correct writing issues. It provides a structured screening layer to help users identify ungrounded claims, phantom sources, and internal contradictions, ensuring data privacy by processing text entirely on-device.

features

Key Features of Proofly

Proofly offers a suite of features designed for comprehensive content verification and writing enhancement, prioritizing on-device processing for privacy.

  • 100% On-Device & Private AI: All processing occurs locally, with no data transmitted to external servers.
  • Offline Functionality: Operates completely offline after the initial model download.
  • Leverages Chrome's Gemini Nano AI: Utilizes the browser's integrated AI capabilities for proofreading.
  • Real-time Corrections: Underlines spelling, grammar, and punctuation issues as text is typed.
  • Transparent Confidence Scores: Provides visibility into the AI's certainty regarding identified issues.
  • Actionable Verification Steps: Guides users through steps to verify flagged content.
  • Isolated Assertions Detection: Identifies claims lacking supporting context or evidence.
  • Phantom Citation Detection: Flags references to non-existent or fabricated sources.
  • Internal Contradiction Spotting: Locates inconsistencies within the provided text.
  • Customizable Experience: Users can toggle specific correction types and adjust error color coding.

use cases

Who Should Use Proofly?

Proofly is designed for a diverse range of users who require secure, on-device AI assistance for content verification and writing improvement, particularly those handling sensitive information.

  • Professionals handling sensitive documents: Ensures data privacy for legal, medical, or proprietary content.
  • Students and Academics: Assists with literature reviews, papers, and reports, verifying claims and sources.
  • Legal Practitioners: Provides secure proofreading for sensitive legal documents and communications.
  • Researchers, Analysts, and Strategists: Audits reports, pitch decks, and whitepapers for accuracy and consistency.
  • Privacy-conscious individuals and organizations: Offers a secure alternative to cloud-based writing assistants for personal and professional communications.

how to use

How to Use Proofly

To begin using Proofly, users install the Chrome extension and allow it to download the necessary AI models for on-device processing. Once installed, it operates in real-time within the browser.

  • 1Install the Proofly Chrome extension from the Chrome Web Store.
  • 2Allow the extension to download the required AI models to your device.
  • 3Navigate to any webpage where text input is available.
  • 4Begin typing or paste existing text into a text field.
  • 5Proofly will automatically underline identified spelling, grammar, punctuation, or content verification issues.
  • 6Click on underlined suggestions to view proposed corrections or verification steps.

pricing

Proofly Pricing & Plans

Proofly, specifically the private AI proofreading Chrome extension, is offered as a free and open-source tool. It does not require any accounts, tracking, or telemetry, providing full functionality without cost.

  • Free: Full access to all on-device AI proofreading and content verification features.

Pros

  • +100% on-device processing ensures maximum data privacy and security.
  • +Free and open-source, eliminating subscription costs and fostering transparency.
  • +Functions completely offline after initial model download, enhancing reliability.
  • +Detects complex content issues like ungrounded claims, phantom sources, and internal contradictions.
  • +Lightweight Chrome extension with real-time feedback and customizable settings.

Cons

  • −Performance is tied to the capabilities of Chrome's built-in AI (Gemini Nano) and device hardware.
  • −May not offer the same depth of stylistic suggestions or advanced linguistic analysis as some cloud-based, paid alternatives.
  • −Limited to the Chrome browser environment as an extension.
  • −Requires an initial model download, which may consume local storage.
  • −As a relatively newer tool (launched ~Dec 2025), its feature set may evolve compared to more mature platforms.

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