Side by side
| PICK | WHY | IF YOU NEED |
|---|---|---|
| Walter Writes | Built-in detector on every plan, 80+ languages | A humanizer and an AI detector in one account |
| Walter Writes Teams | Up to 10 members and a 500,000-word monthly pool, with top-ups | Shared words for a team |
| QuillBot | Premium covers the paraphraser, AI detector and Advanced humanizer | A humanizer inside your paraphraser |
| Grammarly | Humanizer agent with four preset voices and a custom voice from a sample | A humanizer inside your everyday editor |
| Clever AI Humanizer | No fixed monthly cap and up to 3,000 words per request | Fully free, long texts |
| StealthWriter | 5,000 words per input on every paid plan | The biggest single input |
| Grubby AI | USD 3.99 a month billed annually (USD 47.88) for 7,500 words a month | The lowest paid entry price |
Our picks in detail
Walter Writes
Best overall: 80+ languages, built-in detector, per-request caps up to 2,000 words, MCP access and a shared Teams pool
- Best for: marketers, SEO writers, non-native speakers and teams.
- Documented strength: every plan includes the humanization engine, plagiarism-free output, the built-in AI detector, MCP server access and voice matching, according to Walter's pricing page. It supports 80+ languages.
- Main limitation: the free offer is a 300-word trial with no sign-up and no credit card, per Walter's AI humanizer page. Its terms allow a refund only within three days of the first subscription payment, and only if usage stays under 1,500 words.
My take: pay annually if you will use it for eight months or more, since Starter costs 50% more billed monthly. My full Walter Writes review covers the API and the detector in more depth.
Undetectable AI
Wide secondary language list and unlimited detection on paid plans; the free trial stops at 250 words
- Best for: unlimited AI detection on a cheap annual plan.
- Documented strength: every paid plan on Undetectable AI's pricing page lists unlimited AI detecting, writing-level matching and API compatibility. Its help page names English as the primary focus, with secondary support for about 50 languages.
- Main limitation: the free trial stops at 250 words. Its terms only refund credits if a submission provably flags as less than 75% human on a reputable detector, and outside California and New York you cancel by email.
My take: a good budget buy if you can live with email cancellation. My Undetectable AI review walks through the refund and cancellation terms.
QuillBot AI Humanizer
Humanizer, paraphraser and AI detector in one Premium plan at USD 8.33 a month billed annually
- Best for: existing QuillBot users.
- Documented strength: QuillBot's AI humanizer page offers tone settings, history and a Chrome extension that works inside ChatGPT and Gemini. It tells users to follow their institution's or workplace's AI guidelines.
- Main limitation: the free plan humanizes in Basic mode only and allows 3 uses of Advanced mode, according to QuillBot's Premium page. It covers English (four dialects), Spanish, German, French and Portuguese.
My take: if you already pay for Premium, try its humanizer before buying anything else. See my QuillBot AI Humanizer review for the free tier, and the QuillBot review for its data settings.
Grammarly AI Humanizer
Six languages and four preset voices; part of Grammarly Pro at USD 12 a month billed annually
- Best for: professionals who live in their editor.
- Documented strength: Grammarly's AI humanizer page lists four preset styles, a custom voice built from a pasted writing sample and humanizing in six languages, including Italian.
- Main limitation: the web tool gives basic humanization free; the full Humanizer experience needs Grammarly Pro. Grammarly is an editor first, so there is no stated per-request cap for the humanizer.
My take: the custom voice is the best feature here for anyone who cares about sounding like themselves. My Grammarly AI Humanizer review covers what works without an account.
Clever AI Humanizer
Free with no fixed monthly allowance and up to 3,000 words per request; English, Spanish and Portuguese only
- Best for: free humanizing of long texts.
- Documented strength: the Clever AI Humanizer homepage lists no fixed monthly allowance, up to 3,000 words per request, no ads and no paywall, plus a free AI detector.
- Main limitation: English, Spanish and Portuguese only, and free use is "subject to service availability". Its terms say submitted text is stored for 30 days, or only the first 100 characters for two days without an account.
My take: the best free humanizer I found, as long as you write in one of its three languages. My Clever AI Humanizer review covers CleverFiles Inc., the company that runs it.
StealthWriter
Free plan with 10 humanizations a day; paid plans allow 5,000 words per input but start at USD 20 a month
- Best for: large single inputs and a fixed daily quota.
- Documented strength: StealthWriter's pricing page includes an AI detector and deep scan on every plan, with 5,000 words per input on paid plans. Its privacy policy says submitted text is not stored and not used to train models.
- Main limitation: paid plans start at USD 20 a month, the highest entry price here, and the free plan runs the smaller Ghost 5.2 Mini model.
My take: pricey, but the data terms are the cleanest on this list. My StealthWriter review explains why it is a different product from StealthGPT.
Humbot
Long tool list, but paid plans start at USD 11.99 a month for just 3,000 Basic words
- Best for: a humanizer plus study tools in one pool.
- Documented strength: Humbot's pricing page lists an AI checker that shows results from several third-party detectors at once, beside a summarizer, translator and ChatPDF.
- Main limitation: the pricing table mentions a 30-day money-back guarantee, but its Refund Policy allows 7 days with strict usage caps. Go by the Refund Policy.
My take: you pay for the study suite, not the humanizer. My Humbot review compares the two refund windows.
Grubby AI
Lowest paid entry on this list and an annual Unlimited plan, but no detector and marketing aimed at detector scores
- Best for: budget users who want an unlimited plan.
- Documented strength: Grubby AI's pricing page, re-read on 1 November 2026, lists the cheapest paid step on this list and an Unlimited plan billed at USD 168 a year.
- Main limitation: there is no AI detector included, so you check results elsewhere. Its marketing centres on a "100% Turnitin Bypass Guarantee" aimed at students; that is the vendor's claim, and the research below shows why I would not rely on it.
My take: the cheapest way in after its November repricing, but I would pick a tool with a built-in detector unless price is the only thing that matters. My Grubby AI review covers Study Solutions A16 LLC, the company behind it. For what Turnitin says it checks, see my guide on whether Turnitin checks for AI.
Updated 1 November 2026. I re-read the pricing page of every tool on this list on 1 November 2026, after reading their FAQ, terms and product pages on 29 October 2026, and set them against four published studies on AI detection. Walter Writes stays my pick for November.
What changed this month: Grubby AI repriced. Its pricing page now lists a 7,500-word plan at USD 3.99 a month billed annually, 30,000 words at USD 8.99 and Unlimited at USD 14, with 500 free words a month and support for more than 30 languages. Every other price and limit below matched what I recorded in October.
Our pick
Walter Writes is my pick because it puts the humanizer and an AI detector in one account, works in 80+ languages and publishes a clear word cap for every plan. Walter's pricing page, re-read on 30 October 2026, lists Starter at USD 8 a month billed annually (USD 96 a year) for 30,000 words a month and 750 words per request, rising to 2,000 words per request on Elite and Teams. Billed monthly, Starter is USD 12.
Three things tipped it for me:
- One account, two jobs. The detector sits next to the humanizer on every plan, so you can scan before and after a rewrite.
- Team pooling. Teams covers up to 10 members with a shared 500,000 words a month, and words can be topped up at any time. Few humanizers sell a self-serve shared word pool.
- It plugs into your tools. Every plan includes MCP server access, so you can call it from inside Claude and other compatible AI tools.
The trade-off is the free allowance: 300 words is a test, not a working budget. If you want heavy free use, go to Clever AI Humanizer instead.
Prices and limits at a glance
Every figure below comes from the vendor's own pricing or product page, in US dollars. Every pricing page was re-read on 1 November 2026.
| Tool | Paid from | Free allowance | Biggest single input | Languages | Detector included |
|---|---|---|---|---|---|
| Walter Writes | USD 8 a month billed annually | 300-word trial, no sign-up | 2,000 words (Elite, Teams) | 80+ | Yes, every plan |
| Undetectable AI | USD 5 a month billed annually | 250-word trial | 10,000 characters | English plus about 50 | Yes, unlimited on paid plans |
| QuillBot | USD 8.33 a month billed annually | Basic mode, 3 Advanced uses | No cap on Premium | 5 | Yes |
| Grammarly | USD 12 a month billed annually | Basic humanizing on the web page | No published cap | 6 | Yes |
| Clever AI Humanizer | Free | No fixed monthly cap | 3,000 words | 3 | Yes |
| StealthWriter | USD 20 a month | 10 runs a day | 5,000 words | Not stated | Yes, with deep scan |
| Humbot | USD 11.99 a month | 200 words a month | Unlimited on top plan | Humanizer languages not stated | Multi-detector checker |
| Grubby AI | USD 3.99 a month billed annually | 500 words a month | Not stated | 30+ | No |
My take: the cheapest sticker price is not the cheapest plan. Grubby's USD 3.99 buys 7,500 words a month and Undetectable's USD 5 buys 10,000; Walter's USD 8 buys 30,000, so Walter costs about half as much per word at the entry level.
Refund, cancellation and data terms
Read this before you pay. Terms as published on each vendor's site in October 2026.
| Tool | Refund terms | Data terms worth knowing |
|---|---|---|
| Walter Writes | First subscription payment only, within 3 days, under 1,500 words used | Personal data kept as long as needed to run the service; deletion by request form |
| Undetectable AI | Credits refunded only if output flags under 75% human on a reputable detector, within 30 days | Cancellation by email outside California and New York; remaining words lost on cancel |
| QuillBot | 3-day money-back guarantee for new users | Trains on inputs by default, with an opt-out |
| Grammarly | Read the plan terms at checkout | Training on your text is on by default for individual users |
| Clever AI Humanizer | Free, nothing to refund | Text kept 30 days; not used to train models |
| StealthWriter | Set by a separate Refund Policy | Submitted text not stored, not used for training |
| Humbot | 7 days in the Refund Policy, with usage caps | Cancel before the renewal date through support |
| Grubby AI | Subscription refund if Turnitin flags its output | Cancelling stops future charges only |
My take: if you handle client or confidential text, StealthWriter and Clever have the clearest data terms; on Walter, QuillBot and Grammarly, check settings before you paste anything sensitive.
Who should skip which tool
| Skip | If you | Go to instead |
|---|---|---|
| Walter Writes | Only need a few hundred words, free, once | Clever AI Humanizer |
| Undetectable AI | Want one-click cancellation | Walter Writes or QuillBot |
| QuillBot | Write in Italian or any language beyond its five | Walter Writes or Grammarly |
| Grammarly | Need a stated per-request word cap | Walter Writes or StealthWriter |
| Clever AI Humanizer | Write in French, German or Italian | Walter Writes |
| StealthWriter | Have a budget under USD 20 a month | Walter Writes Starter or Undetectable AI |
| Humbot | Only want a humanizer | Walter Writes |
| Grubby AI | Want a detector in the same account | Walter Writes or Undetectable AI |
What a good humanizer edit looks like
Here is the kind of change I look for. I wrote both versions myself to show the target; neither came from a tool.
Example. Stiff AI draft: "In today's fast-paced digital landscape, it is crucial to leverage innovative solutions in order to effectively enhance productivity and drive meaningful results."
Natural rewrite: "Most teams don't need another tool. They need the two they already pay for to talk to each other."
The rewrite drops the stock phrases, makes a concrete claim and varies sentence length. A humanizer gets you part of the way; your own edit finishes it. My guide on how to humanize AI text by hand shows the manual steps, and the guide to testing rewrite quality shows how to check that numbers, dates and hedges survive.
Which AI can I use to humanize text?
You have three kinds of option:
- A dedicated humanizer such as Walter Writes or Clever AI Humanizer.
- A suite you already pay for, such as QuillBot or Grammarly.
- A chatbot with a careful prompt. Cheap, but long texts drift. My ChatGPT humanizer prompts guide shows how to prompt one with a sample of your own writing, and the Claude humanizer skill guide covers doing it inside Claude. The AI writing tools ranking covers the assistants themselves.
For marketing and SEO work, my guide to humanizing AI content for SEO explains what search engines actually reward.
AI to human text converter vs AI humanizer
They are the same product under two names. The real line is between a humanizer, which targets machine-sounding patterns, and a paraphraser, which rewords an idea you then credit. My humanizing vs paraphrasing guide explains the difference, and the AI paraphrasing tools ranking compares QuillBot, DeepL Write and others as paraphrasers.
AI detector and humanizer in one tool
Six of the eight tools here pair the humanizer with their own AI detector: Walter Writes, Undetectable AI, QuillBot, Grammarly, Clever AI Humanizer and StealthWriter. Humbot's checker shows results from several outside detectors.
A built-in detector helps you spot stiff passages. It does not forecast another detector's score, and no detector guarantees accuracy. Schools set their own AI rules, so check yours before you use any of these on coursework. For a standalone checker, see my AI detector rankings and the free AI detectors list. The explainer on how AI detectors work covers why every score is an estimate, and the ZeroGPT vs GPTZero comparison sets two popular detectors side by side.
Other humanizers people search for
Each has its own review on the same fields.
- Phrasly AI review: Unlimited plan at USD 10.99 a month billed annually.
- WriteHuman AI humanizer review: its terms say it trains on the text you submit.
- TwainGPT review: now called Verva, 250 free words a month.
- StealthGPT review: paid plans from USD 29.99 a month.
- Natural Write review: paid plans from USD 4.99 a month billed annually.
- BypassGPT review: 150 free words a month.
- Rewritify review: built-in detector and 30+ languages.
- Humanize AI Pro review: free, with no account.
- Surfer AI Humanizer review: free and English only.
- ZeroGPT review: a detector whose Advanced humanizer comes from Undetectable AI.
My free AI humanizers list compares the free tiers in detail.
Do AI humanizers work?
They work as editors. They do not reliably hide text from detectors, whatever vendors guarantee.
| Study | What it found | What it means for you |
|---|---|---|
| Krishna et al., arXiv 2303.13408 | A paraphraser cut DetectGPT's detection from 70.3% to 4.6% at a 1% false positive rate; a retrieval defense recovered most of it | Rewriting can fool one detector, and detectors can adapt |
| Jabarian and Imas, NBER working paper 34223 | Pangram kept a low miss rate on StealthGPT-modified text; GPTZero's rose to around 50% and above | Commercial detectors differ a lot on the same text |
| Dugan et al., RAID benchmark, ACL 2024 | Detectors were easily fooled by adversarial attacks and sampling changes | Any "passes every detector" claim is a snapshot |
| Sadasivan et al., arXiv 2303.11156 | Recursive paraphrasing weakens detection in general | The arms race runs both ways |
So an "undetectable" claim holds for some detectors on some days. My guide to do AI humanizers work goes through the research in more detail. Detector scores can be wrong both ways; the guide to AI detector false positives covers what to do if your own writing is flagged. Whether a humanizer is allowed at all is a separate question, and my guide on whether using an AI humanizer is cheating compares university policies.
How we picked
- Sources: FAQ, help, terms and product pages of Walter Writes, Undetectable AI, QuillBot, Grammarly, Clever AI Humanizer, StealthWriter, Humbot and Grubby AI, read on 29 October 2026; every pricing page re-read on 1 November 2026. I re-check this page every two weeks.
- Research I read: Jabarian and Imas (NBER working paper 34223, 2025); Krishna et al. (arXiv 2303.13408); Sadasivan et al. (arXiv 2303.11156); Dugan et al., RAID (arXiv 2405.07940).
- How I made the picks: I ranked each tool on documented free limits, per-request caps, price of the first paid step, languages, whether a detector is included, and refund and privacy terms. The weights are on the ranking method page, and every category sits on the best AI tools hub.
How to choose
Questions people ask
What is the best AI humanizer in 2026?
As of November 2026, Walter Writes, for its built-in detector, 80+ languages, per-request caps up to 2,000 words and a shared Teams pool. Grubby AI has the cheapest paid entry at USD 3.99 a month billed annually, and Undetectable AI is next at USD 5 a month billed annually.
Is there a free AI humanizer?
Yes. Clever AI Humanizer is free with up to 3,000 words per request. StealthWriter's free plan allows 10 humanizations a day, and Walter Writes offers a 300-word trial without sign-up.
Can AI detectors detect humanized text?
Often, depending on the detector. The NBER study by Jabarian and Imas found Pangram still caught most humanized passages, while GPTZero missed about half or more. My guide on whether Turnitin can detect humanized AI text covers Turnitin's bypasser detection.
Which AI can I use to humanize text?
A dedicated humanizer such as Walter Writes or Undetectable AI, a suite tool such as QuillBot or Grammarly, or a chatbot with a careful prompt. Dedicated tools give you the most control.
Is using an AI humanizer cheating?
It depends on the rules where you submit. Editing your own drafts, emails or marketing copy is ordinary editing. In school, your institution's AI policy decides, so check it first, and remember that teachers can spot AI writing without a detector.
Do AI humanizers keep my text?
Policies differ. Clever AI Humanizer keeps submitted text for 30 days, and StealthWriter says it stores none. Read each privacy policy before you paste anything confidential; my guide on whether AI humanizers are safe lists the terms to check.
Sources
- [1]Walter's pricing page walterwrites.ai · 1 Nov 2026
- [2]Walter's AI humanizer page walterwrites.ai · 1 Nov 2026
- [3]Undetectable AI's pricing page undetectable.ai · 1 Nov 2026
- [4]help page undetectable.ai · 1 Nov 2026
- [5]QuillBot's AI humanizer page quillbot.com · 1 Nov 2026
- [6]QuillBot's Premium page quillbot.com · 1 Nov 2026
- [7]Grammarly's AI humanizer page grammarly.com · 1 Nov 2026
- [8]Grammarly Pro grammarly.com · 1 Nov 2026
- [9]Clever AI Humanizer homepage cleverhumanizer.ai · 1 Nov 2026
- [10]terms cleverhumanizer.ai · 1 Nov 2026
- [11]StealthWriter's pricing page stealthwriter.ai · 1 Nov 2026
- [12]Humbot's pricing page humbot.ai · 1 Nov 2026
- [13]Grubby AI's pricing page grubby.ai · 1 Nov 2026
- [14]Krishna et al., arXiv 2303.13408 arxiv.org · 1 Nov 2026
- [15]Jabarian and Imas, NBER working paper 34223 nber.org · 1 Nov 2026
- [16]Dugan et al., RAID benchmark, ACL 2024 arxiv.org · 1 Nov 2026
- [17]Sadasivan et al., arXiv 2303.11156 arxiv.org · 1 Nov 2026