Humanizer vs Proofly: Features, Pricing & Which Is Better (2026)

A side-by-side comparison of Humanizer and Proofly — features, pricing, and ideal use cases — to help you decide which AI tool fits your workflow.

Humanizer

blader

Free

An open agent skill that rewrites AI-sounding text to read like a person wrote it, without changing what the text actually says.

25 Named Patterns: A ranked catalogue of AI-writing tells — from 'not X but Y' staging to decorative bold, chatbot residue, and knowledge-limit disclaimers — each with before and after examples.
Strength-Weighted Detection: The first five patterns justify an edit on a single sighting, while patterns marked weak alone only count when several share a passage, so deliberate stylistic choices survive.
Draft-Critique-Final Loop: Humanizer shows its work by producing a first rewrite, a short critique of whatever still sounds artificial, and then the final version.
No Invention Guarantee: Names, numbers, dates, quotes, and citations must come from the source or the writer; if a sentence needs a missing detail the skill asks rather than fabricating one.
Voice Matching: Supply a writing sample and the rewrite follows its rhythm, word choice, punctuation, and deliberate quirks, including em dashes if you use them.
File-Safe Rewriting: Point it at a file path and it edits prose only, leaving code, data, frontmatter, and link targets untouched.
Agent-Agnostic Install: Distributed as Markdown so it works with any skill-capable agent, via the Skills CLI, the Claude Code plugin, or a ZIP upload in Claude Desktop.
Register-Aware Output: Personal writing keeps the writer's opinions and quirks while technical and reference prose stays neutral and plain.

Cleaning Up AI Drafts: Run a model-generated blog post or essay through Humanizer before publishing so it does not read as machine-written.
Matching a House Voice: Provide a sample of existing published work so rewritten copy matches an established author or brand voice.
Documentation Editing: Point the skill at a repository file to strip decorative headings and staged sentences from technical docs without touching code blocks.
Email and Outreach Polish: Remove sales language and borrowed authority from outbound copy so claims are stated plainly.
Editorial Review: Use the marked list of tells as a critique pass to teach writers which habits read as AI-generated.
Agent Pipeline Step: Chain Humanizer after a drafting agent so generated text is normalized before a human ever reviews it.

onderceylan (Proofly)

Free

Lightweight Chrome extension for on-device, privacy-first AI grammar, proofreading and writing assistance that works offline.

On-device Proofreading: Performs grammar, punctuation and style checks locally on the user's machine so text never leaves the device.
Offline Functionality: Full proofreading and suggestion capabilities work without an internet connection, enabling use in restricted or disconnected environments.
Privacy-first Design: Architected to avoid server-side text processing, minimizing data exposure and complying with high privacy expectations and sensitive workflows.
Lightweight Browser Extension: Small footprint extension for Chrome designed to be non-invasive in the page UI and to avoid heavy resource usage.
Real-time Writing Assistance: Provides instantaneous suggestions and corrections within browser text fields and editors while typing.
Open-source Repository: Source code is published on GitHub, allowing inspection, auditing, and self-hosted or unpacked-install options for advanced users.
On-device grammar correction and proofreading (no network calls)
Runs offline for total privacy
Lightweight, non-invasive browser extension UI
Distributed via Chrome Web Store and source on GitHub
Can be installed as an unpacked extension from source
Maintained releases (versioned GitHub releases)

Composing and proofreading sensitive emails or legal drafts directly in Chrome while ensuring no text leaves the device.
Editing documents and essays offline (e.g., on airplanes or in secure environments) with full grammar and style suggestions.
Privacy-conscious professionals who require local-only language checks for proprietary or confidential content.
Students and writers who want instant, lightweight grammar corrections in browser-based editors without subscribing to cloud services.
Teams or enterprises that prefer to audit and deploy browser extensions from source (unpacked or internal store) for tighter control.
Real-time grammar and spelling checks while composing emails or social posts in the browser
Proofreading sensitive or private documents without sending text to external servers
Offline writing assistance in environments without internet connectivity
Deploying in privacy-conscious workflows or on shared devices