AI humanizer Chrome extensions
Update date is the order because an extension that is not maintained breaks when Google Docs or Gmail changes its editor, and because it is the one fact a store listing states that a vendor's own page does not. It is a maintenance signal, not a quality verdict.
Six extensions ordered by the date the Chrome Web Store listing was last updated, most recent first. The free tier, cheapest plan, cap and modes are the web account's, from the vendor's own pages; the surfaces, publisher and data columns are from the listing, all read 9 November 2026.
Which humanizer extension should you install?
- Choose Grammarly's extension if you already run Grammarly in Gmail and Docs and want its humanizer agent reachable from the same account.
- Choose Monica if you want a rewrite feature inside a general assistant and accept a wide data declaration.
- Choose Walter Writes AI's extension if you want highlight-and-humanize in Docs and Gmail with a strength choice and will pay $8 a month billed yearly after the trial.
- Choose QuillBot's extension if you want the humanizer named in the title, a paragraph at a time, free.
- Choose StealthGPT's extension only if you already pay for StealthGPT; it is not sold on its own.
- Choose Smodin's extension if you want detect-then-humanize in Notion as well as Docs and five free runs a week are enough.
What does a store listing tell you that a vendor page does not?
Three things: the surfaces the extension runs on, the data categories the publisher declares, and the date of the last update. Grammarly's listing says the extension offers suggestions in Gmail, Google Docs, LinkedIn and across 500,000 other sites, declares personally identifiable information, personal communications, location, user activity and website content, and was updated 9 November 2026 at version 14.1346.0 (Grammarly, Chrome Web Store listing, read 9 November 2026). The listing does not use the word humanizer; that feature lives in the web account, where it is counted in AI prompts, as the Grammarly humanizer review explains.
QuillBot's listing names the humanizer in its title, says it works in any text field across the web, lists six interface languages, declares personally identifiable information, personal communications, location and website content, and was updated 23 October 2026 at version 4.123.0 (QuillBot, Chrome Web Store listing, read 9 November 2026). The free limit is the web tool's 125 words per input, as the QuillBot humanizer review sets out.
| Extension | Surfaces named in the listing | Data categories declared | Publisher trader declaration |
|---|---|---|---|
| Grammarly | Gmail, Google Docs, LinkedIn, 500,000 other sites | Personally identifiable information, personal communications, location, user activity, website content | Yes, with a business address |
| Monica | Any page via a keyboard shortcut; Gmail reply suggestions | Personally identifiable information, financial and payment information, personal communications, user activity | Yes |
| Walter Writes AI | Google Docs, Gmail, WordPress and other web editors | User activity, website content | Yes, with a business address |
| QuillBot | Any text field across the web | Personally identifiable information, personal communications, location, website content | Yes, with a business address |
| StealthGPT | Any webpage by right-click; an auto-typer into any field | Personally identifiable information, authentication information, website content | Yes, with a business address |
| Smodin | Google Docs, Sheets, Gmail, Notion, blogs and text fields | Personally identifiable information, authentication information, website content | Yes, with a business address |
All six declare that data is not sold to third parties outside the store's approved use cases, read 9 November 2026. Every extension on this page reads the page you type on; that is what an in-page rewrite requires, and the listing says so.
Which humanizer extensions are lookalikes?
Searching the store for a well-known humanizer name returns listings that are not from that vendor. On 9 November 2026 a listing titled Undetectable AI, version 1.0.1, last updated 17 December 2025, was offered by a developer identified only by a webmail address, with a privacy policy hosted as a shared online document and no trader declaration; no listing from the company behind undetectable.ai was found in the same search. The listing's description promises to pass detectors, which no vendor can promise and which this site does not evaluate.
The check is the same for any extension: open the Details section, read the developer name and address, and compare it with the company on the vendor's own pricing page. StealthGPT's listing, for example, is published by XYZ AI LLC with a business address and a privacy policy on stealthgpt.ai, says the extension is included with every StealthGPT subscription, and was updated 28 August 2026 at version 3.0.1 (StealthGPT, Chrome Web Store listing, read 9 November 2026). Smodin's is published by Guide Education LLC, states a free plan of 5 detections and humanizations a week, and was updated 17 August 2026 at version 0.10.2 (Smodin, Chrome Web Store listing, read 9 November 2026).
| Sign on the listing | What it means |
|---|---|
| Developer shown as a company with a street address and a trader declaration | The publisher is identifiable and answerable under consumer law in the EU |
| Developer shown as an email address only, no trader declaration | Nothing ties the listing to the brand in its title |
| Privacy policy on the vendor's own domain | The same policy that governs the web tool |
| Privacy policy on a shared document link | No stated relationship to any company |
| Listing promises to pass or bypass named detectors | A marketing claim with no method or date; this site reports dated readings only once a run exists |
Six AI humanizer chrome extension listings from vendors this site reviews were live in the Chrome Web Store on 9 November 2026. Grammarly's was the most recently updated, on 9 November 2026 itself. An extension is the vendor's web humanizer reached from Google Docs, Gmail or any text field, so the plan limits are the web plan's limits; what the listing adds is where the tool runs, who publishes it, what data it declares and when it was last maintained. This page orders six extensions by their listing update date and ranks nothing by a score; the overall list is the full humanizer ranking and the other audiences are in the best-for hub.
Updated
Short answer
Six AI humanizer chrome extension listings from vendors this site reviews were live in the Chrome Web Store on 9 November 2026. Grammarly's was the most recently updated, on 9 November 2026 itself, with QuillBot, Walter Writes AI, Monica, StealthGPT and Smodin behind it. An extension is the vendor's web tool reached from Google Docs, Gmail or a text field, so the underlying free tier, request cap and modes are the same as on the web, and what the listing adds is where it runs, who publishes it, what data it declares and when it was last maintained. This page orders the six by listing update date and warns about a lookalike listing using a well-known brand name. No tool here carries a score.
Which AI humanizer chrome extension runs where you write?
Mode names are the vendor's own. Detector readings under the published method are added to each tool's block when the first run publishes; the run uses the web tool, and no listing claims the extension produces different output.
| Order | Tool and listing | Best for | Main limitation | Free tier (web account) | Cheapest plan (checked on 8 November 2026 unless dated) | Per-request cap | Named modes | Listing updated | Review |
|---|---|---|---|---|---|---|---|---|---|
| 01 | Grammarly: AI Writing Assistant, published by Grammarly | Rewrites inside Gmail and Google Docs from a grammar product you may already run | The listing does not name the humanizer; the humanizer agent is a web account feature, and no word figure is published | Free account, 100 AI prompts a month | Pro, $12 shown on the plans card, billing period not stated (read 9 November 2026) | Not stated | Four preset voices plus a custom voice | 9 November 2026, version 14.1346.0 | |
| 02 | Monica: All-In-One AI Assist, published by Butterfly Effect Pte. Ltd. | A rewrite feature inside a general assistant with a keyboard shortcut on any page | The humanizer is one line in a long feature list; the listing declares financial and payment information among the data it handles | Limited free use, per the listing | Premium plan; price not stated in the listing (read 9 November 2026) | Not stated | A rewrite feature the vendor calls AI-Bypass Rewrite; no strength steps named | 2 November 2026, version 9.0.24 | |
| 03 | AI Humanizer and Detector (the Walter Writes AI extension, publisher Walter AI Inc.) | Highlight, right-click and humanize or scan inside Google Docs and Gmail | The web plan's limits apply: a 300-word trial once and a 750-word request cap on Starter | 300-word trial, no card | Starter, 30,000 words a month, $8 a month billed $96 yearly | 750 words (Starter) | Simple, Standard, Enhanced on the web account | 29 October 2026, version 2.1.4.10 | |
| 04 | Quillbot: AI Writing Assistant with Humanizer, published by QuillBot (Course Hero), LLC | A humanizer named in the listing title, in any text field, with a 6-language interface | Free Basic mode takes 125 words per input; Advanced is 3 uses | 125 words per input, Basic mode; 3 Advanced uses | Premium, $8.33 a month billed annually | 125 words free | Basic, Advanced | 23 October 2026, version 4.123.0 | |
| 05 | StealthGPT, published by XYZ AI LLC | Right-click humanize on any page for an existing StealthGPT subscriber | Included only with a paid subscription; the listing also advertises a quiz solver and a human-typing auto-typer, which is not a writing feature | None; $1 three-day trial on the web | Pro, 50,000 words a month, $29.99 monthly | 1,000 words (Pro) | Not stated | 28 August 2026, version 3.0.1 | |
| 06 | Smodin: Detect AI, Humanize Instantly, published by Guide Education LLC | Detect then humanize in Google Docs, Notion and Gmail with a side panel | 5 detections and humanizations a week on the free plan, per the listing; the paid price is not in the listing | 5 detections and humanizations a week, lower character limits (listing, read 9 November 2026) | Premium, unlimited usage per the listing; price not stated there | Not stated | None named | 17 August 2026, version 0.10.2 |
How the ranking works
- Inputs
- 24 texts24 AI-written inputs across six genres plus 6 human-written controls, the same set for every tool.
- Detectors
- 5 namedGPTZero, Originality.ai, Copyleaks, Pangram and ZeroGPT.
- Weights
- Meaning kept35
- Errors introduced20
- Detector pass rate30
- Limits and access15
- Run date
The six extensions on the same fields
Every free tier gets the same fields, in rank order. The disc is the sample number it was poured under in the full run.
Sample 01: Grammarly: AI Writing Assistant
Grammarly's extension is published by Grammarly, was updated 9 November 2026 at version 14.1346.0, and does not name the humanizer in its listing, read 9 November 2026.
- Best for
- rewrites inside Gmail and Google Docs from an account you may already have.
- Main limitation
- the humanizer is a web account feature counted in AI prompts, with no word figure published.
- Free tier
- free account, 100 AI prompts a month.
- Cheapest plan
- Pro, $12 shown on the plans card, billing period not stated, read 9 November 2026.
- Per-request cap
- not stated.
- Named modes
- four preset voices plus a custom voice.
Sample 02: Monica: All-In-One AI Assist
Monica's extension is published by Butterfly Effect Pte. Ltd. and was updated 2 November 2026 at version 9.0.24; its Chrome Web Store listing names a rewrite feature it calls AI-Bypass Rewrite among many others, read 9 November 2026.
- Best for
- a rewrite feature inside a general assistant with a keyboard shortcut on any page.
- Main limitation
- the humanizer is one line in a long feature list, and the listing declares financial and payment information among the data handled.
- Free tier
- limited free use, per the listing.
- Cheapest plan
- Premium; price not stated in the listing, read 9 November 2026.
- Per-request cap
- not stated.
- Named modes
- none named for the rewrite.
Sample 03: AI Humanizer and Detector (Walter Writes AI extension)
Walter Writes AI's extension is published by Walter AI Inc. of Montreal, was updated 29 October 2026 at version 2.1.4.10, and declares user activity and website content, per its Chrome Web Store listing read 9 November 2026. The listing describes highlighting text, right-clicking to humanize or scan, and inserting the result in Google Docs, Gmail and other web editors.
- Best for
- highlight-and-humanize in Docs and Gmail with a strength choice on the web account.
- Main limitation
- the web plan's 300-word one-time trial and 750-word Starter request cap apply inside the extension.
- Free tier
- 300-word trial, no card.
- Cheapest plan
- Starter, 30,000 words a month, $8 a month billed $96 yearly, checked on 8 November 2026.
- Per-request cap
- 750 words on Starter.
- Named modes
- Simple, Standard, Enhanced.
Sample 04: Quillbot: AI Writing Assistant with Humanizer
QuillBot's extension is published by QuillBot (Course Hero), LLC, was updated 23 October 2026 at version 4.123.0, and lists a 6-language interface, read 9 November 2026.
- Best for
- a humanizer named in the title, usable in any text field, a paragraph at a time.
- Main limitation
- free Basic mode takes 125 words per input, and Advanced is 3 uses.
- Free tier
- 125 words per input, Basic mode; 3 Advanced uses.
- Cheapest plan
- Premium, $8.33 a month billed annually, checked on 8 November 2026.
- Per-request cap
- 125 words free; none stated on Premium.
- Named modes
- Basic, Advanced.
Sample 05: StealthGPT
StealthGPT's extension is published by XYZ AI LLC, was updated 28 August 2026 at version 3.0.1, and is included with a paid StealthGPT subscription, read 9 November 2026.
- Best for
- right-click humanize on any page for an existing subscriber.
- Main limitation
- not usable without a paid plan, and the listing bundles a quiz solver and an auto-typer with the humanizer.
- Free tier
- none; $1 three-day trial on the web.
- Cheapest plan
- Pro, 50,000 words a month, $29.99 monthly, checked on 8 November 2026.
- Per-request cap
- 1,000 words on Pro.
- Named modes
- not stated.
Sample 06: Smodin: Detect AI, Humanize Instantly
Smodin's extension is published by Guide Education LLC, was updated 17 August 2026 at version 0.10.2, and states a free plan of 5 detections and humanizations a week, read 9 November 2026.
- Best for
- detect-then-humanize in Google Docs, Notion and Gmail from a side panel.
- Main limitation
- five free runs a week with lower character limits, and the paid price is not in the listing.
- Free tier
- 5 detections and humanizations a week, per the listing.
- Cheapest plan
- Premium, unlimited usage per the listing; price not stated there, read 9 November 2026.
- Per-request cap
- not stated.
- Named modes
- none named.
Why do lists of humanizer extensions disagree?
Most are built from store search results, which mix vendor listings with lookalikes using the same brand names, and most rank by install counts or star ratings, which this page does not report because they measure popularity, not output. This page lists only extensions whose publisher matches the company on the vendor's own pricing page, orders by maintenance date, and states the web plan's limits, which change only when a vendor edits a page. The corrections log records each change.
Questions about AI humanizers for chrome extension
Is there an AI humanizer Chrome extension?
Yes: on 9 November 2026 the Chrome Web Store carried listings from Grammarly, QuillBot, Walter Writes AI, Monica, StealthGPT and Smodin that name a humanizer or a rewrite feature, each tied to the vendor's web account and its plan limits.
Which humanizer extension works in Google Docs?
Grammarly's listing names Gmail and Google Docs, QuillBot's says any text field across the web, Walter Writes AI's names Google Docs and Gmail, and Smodin's names Google Docs, Notion and Gmail, all read 9 November 2026; Monica and StealthGPT describe a right-click or side panel on any page.
Are humanizer extensions free?
The extensions install free and run on the vendor's web plan: Grammarly's free account gives 100 AI prompts a month, QuillBot's free Basic mode takes 125 words per input, Smodin's listing states 5 detections and humanizations a week free, and StealthGPT's states the extension is included with a paid subscription, all read 9 November 2026.
Is the Undetectable AI Chrome extension official?
A Chrome Web Store listing titled Undetectable AI, read 9 November 2026, is offered by a developer identified only by a webmail address, with a privacy policy hosted as a shared document and no trader declaration; no listing from the company behind undetectable.ai was found, so treat that listing as unrelated to the web tool.
Does a Chrome extension humanize text differently from the website?
No vendor says so: the listings describe the same humanizer reached from the page you are writing on, and the plan limits, request caps and modes are those of the web account you sign in with.
What data does a humanizer extension collect?
Each listing declares categories: Grammarly's declares personally identifiable information, personal communications, location, user activity and website content; QuillBot's the same minus user activity; Walter Writes AI's user activity and website content; StealthGPT's personally identifiable information, authentication information and website content, all read 9 November 2026.
Which humanizer extension was updated most recently?
Grammarly's, on 9 November 2026 at version 14.1346.0, then Monica's on 2 November, Walter Writes AI's on 29 October, QuillBot's on 23 October, StealthGPT's on 28 August and Smodin's on 17 August 2026, all read on 9 November 2026.
Should I install a humanizer extension at all?
Only if you write in the browser all day and accept that the extension reads the pages you type on, which every listing declares; for occasional use the web tool does the same job with less access.
Sources
- Grammarly, Chrome Web Store listing, read 9 November 2026: Surfaces, data categories, publisher, version 14.1346.0, updated 9 November 2026
- QuillBot, Chrome Web Store listing, read 9 November 2026: Humanizer in title, any text field, 6 languages, data categories, version 4.123.0, updated 23 October 2026
- StealthGPT, Chrome Web Store listing, read 9 November 2026: Included with a subscription, publisher, data categories, version 3.0.1, updated 28 August 2026
- Smodin, Chrome Web Store listing, read 9 November 2026: 5 free runs a week, surfaces, publisher, version 0.10.2, updated 17 August 2026
- Chrome Web Store listings for Walter Writes AI and Monica, read 9 November 2026: Publisher, surfaces, data categories, versions and update dates
- Vendor pricing and product pages, checked 8 and 9 November 2026: Free tiers, plans, request caps and modes for the web accounts
Revision log
| Page published. |
Related reading
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Best AI humanizer: 12 tools, one published methodBest AI humanizer by one published protocol: meaning kept, errors added, detector readings and plan limits.
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