Updated July 2026 · 8 tools compared
Best AI humanizer: 8 tools compared honestly
Every humanizer makes the same promise, so the marketing tells you nothing. What separates them is whether your meaning survives the rewrite, whether the rewrite rebuilds sentences or just swaps words, and whether the score you are shown explains itself or just asks to be believed.
Here is what each tool costs, what it does well, and where it loses. Including where we lose.
2 free runs a day, up to 200 words each. We save your run so you can get back to it, and a delete button appears with the result. See privacy.
This is our own AI-pattern score, measured here on sentence rhythm, template phrases, vocabulary variety and passive voice. It is not a GPTZero, Turnitin, Originality.ai, Copyleaks or ZeroGPT result, and it does not predict one. Worth knowing: we also ask the rewrite to vary sentence length, drop template phrases and prefer the active voice, so some of the drop is built in. Read the two panels below, not just the number.
Before ·
After ·
Meaning kept · Your own text rewritten · Saved to your history, delete any time
The short answer
There is no single best AI humanizer, because the leading tools optimize for different buyers. For a rewrite you can check rather than trust, pick a tool that shows a score and says what it measured, which is what Undetected.ai is built around, at a planned $9 per month for 15,000 words (there is no checkout yet, so you cannot buy it today). For the lowest yearly price, Undetectable.ai is hard to beat at about $5 per month billed annually. To test before paying anything, BypassGPT gives you 150 free words a month and WriteHuman gives you 3 free requests. For a whole writing suite rather than detector clearance, QuillBot at $8.33 per month billed yearly is the better buy and is not really a humanizer. What every one of them shares: they lower detector scores by rewriting the sentence-level patterns detectors measure, and the weak ones get there by mangling your meaning.
Last updated July 24, 2026. Every price here was read off the vendor's own pricing page, in USD. Undetectable.ai, WriteHuman and Walter Writes were re-checked on July 24 and were unchanged; the rest date from July 14. Two of them we could not verify at all, and we say so rather than guess.
The comparison
Every major AI humanizer, side by side
Entry price is each vendor's cheapest paid plan, shown billed monthly with the discounted yearly rate in brackets. Several were running promotions when we checked, and vendors change pricing constantly, so treat this as a July 2026 snapshot and confirm the figure before you buy.
| Tool | Entry price | Volume | Free tier | API | Best for |
|---|---|---|---|---|---|
| Undetected.ai | $9/mo yearly ($12 monthly), a planned price with no checkout yet | 15,000 words/mo on Starter. 250,000 on the $39 Scale plan. | Free account: 3 runs a day, 9,000 words a month | No | Writers and teams who want the rewrite verified on screen |
| Undetectable.ai | $9.99/mo monthly ($5/mo billed yearly) | 10,000 words/mo on the entry tier. $19/mo buys 20,000. | Yes, a 250-word trial | Yes | People who want the market leader and the lowest yearly price |
| BypassGPT / HIX Bypass | $12/mo monthly ($8/mo yearly, on promo) | 5,000 words/mo on Basic. Pro $35/mo buys 30,000. Unlimited $39/mo. | Yes, 150 words/mo | Yes | Buyers who want to test free before paying anything |
| WriteHuman | $18/mo monthly ($12/mo billed yearly) | 80 requests/mo, up to 600 words per request. Ultra is unlimited requests. | Yes, 3 requests/mo at 250 words | Yes, plus MCP access | Developers and agent builders, and anyone humanizing a few long documents |
| Humbot | $11.99/mo monthly ($7.99/mo yearly, on promo) | 3,000 basic plus 1,000 advanced words/mo, 500-word input limit. | Trial offered, limit not published | Yes | Budget buyers who want the humanizer and the detector in one place |
| QuillBot | $19.95/mo monthly ($8.33/mo billed yearly) | Unlimited paraphrasing and humanizing on Premium. | Yes, 125 words, humanizer capped at 6 uses/day | Not for humanizing | Writers who want rewriting and grammar help, not detector clearance |
| Phrasly | $10.99/mo billed yearly, $19.99 monthly | Unlimited humanizations, 5,000 words per process on the Unlimited plan. | $2.00 three-day pass, 800 words per process | Yes, a business API | Heavy-volume writers who want a flat-rate unlimited plan |
| StealthGPT | Could not verify | Could not verify | Could not verify | Yes, it pitches an API | Check it yourself before buying, we could not |
We build one of these tools, so read the row about us with that in mind. The rest of the page tells you where the others win.
Tool by tool
What each one is actually good at
Undetected.ai
Our own AI-pattern score before and after, with the specific reasons behind each number, so you read what the rewrite changed instead of trusting a message.
Best for: Writers and teams who want the rewrite verified on screen.
From: $9/mo yearly ($12 monthly), a planned price with no checkout yet.
Undetectable.ai
The most established name in the category, with a built-in detector, unlimited detection checks and writing-level matching. On a yearly plan it is the cheapest per month of anything here.
Best for: People who want the market leader and the lowest yearly price.
From: $9.99/mo monthly ($5/mo billed yearly).
BypassGPT / HIX Bypass
The most specific bypass claims in the category, naming Turnitin, Originality.ai, GPTZero, ZeroGPT, Copyleaks and Winston by name, plus three rewrite modes and a real free tier.
Best for: Buyers who want to test free before paying anything.
From: $12/mo monthly ($8/mo yearly, on promo).
WriteHuman
Prices by request rather than by word, and is the only tool here shipping MCP access, so an AI agent can call it directly as a tool.
Best for: Developers and agent builders, and anyone humanizing a few long documents.
From: $18/mo monthly ($12/mo billed yearly).
Humbot
Quick, enhanced and advanced modes, an all-in-one checker that shows GPTZero, Originality.ai and ZeroGPT results together, and an interface in 18 languages.
Best for: Budget buyers who want the humanizer and the detector in one place.
From: $11.99/mo monthly ($7.99/mo yearly, on promo).
QuillBot
A full writing suite (9 paraphrase modes, plagiarism checker, 23 languages) that happens to include a humanizer. It is not built to beat detectors and does not claim to be.
Best for: Writers who want rewriting and grammar help, not detector clearance.
From: $19.95/mo monthly ($8.33/mo billed yearly).
Phrasly
Says it trains and runs its own models in the US rather than reselling a general LLM, and bundles a plagiarism check and content generator. The most generous per-submission window here, read August 29, 2026.
Best for: Heavy-volume writers who want a flat-rate unlimited plan.
From: $10.99/mo billed yearly, $19.99 monthly.
StealthGPT
Frequently recommended in roundups, but its pricing page was behind a security checkpoint every time we tried it in July 2026, so we will not publish numbers we could not read.
Best for: Check it yourself before buying, we could not.
From: Could not verify.
How to choose
The five things that actually separate these tools
Price is the easiest thing to compare and the least useful. These are the differences you feel after a month of real use.
1. Does your meaning survive?
This is where cheap tools fail hardest. Raising the "human" score is easy if you swap common words for rare ones, and the result reads like a thesaurus attack. Worse, it quietly edits your facts: "reduced by 40%" becomes "notably reduced" and your number is gone. Paste in a paragraph where the details matter, then check every number and claim survived. If meaning drifted, nothing else about the tool matters.
2. One pass, or whack-a-mole?
Detectors weight their signals differently, so a rewrite tuned to beat GPTZero can still trip Originality.ai. Tools that optimize against a single scanner leave you rerunning your text until something finally passes. Test any candidate against two or three detectors, not the one it recommends.
3. Can you see the score?
Most tools hand back text and a reassuring message. A score you can read, with the reasons behind it, turns that into something you can check against your own text. Ours is an in-house measure and we label it as one; what makes it useful is that it names what it counted, so you can disagree with it. That is the difference we built Undetected.ai around, and it is a fair thing to hold every vendor to.
4. Does it fit your volume?
Word-metered plans suit steady publishing. Request-metered plans, like WriteHuman's, suit people who humanize a few long documents. Unlimited tiers suit teams and agencies. Work out your real monthly word count first, then pick the pricing model that matches it, because the wrong model costs more than the wrong vendor.
5. What happens to your text?
You are pasting client work, unpublished drafts, sometimes sensitive material. What makes a tool trustworthy here is a specific answer rather than a comfortable one, because "never stored" is the easiest sentence in this category to write and the hardest to check. Ours is on our privacy page and it is not the comfortable version: we store your runs so your history is there, you can delete them, we delete what is left after 90 days, and Google's Gemini API sees the text. Read whatever the vendor's equivalent line says, ours included, before you paste anything you would not want in a training set.
The ten-minute test
Take one real paragraph you wrote or generated. Run it through any tool you are considering. Check the facts survived, run the output through two different detectors, then read it aloud. If it sounds like a person talking and the facts are intact, you have your answer, and you did not need anyone's review to get it.
Being straight with you
Where the other tools beat us
There is a free account, deliberately a small one. Three runs a day of up to 1,500 words, 9,000 words a month, no card. The demo on this page runs twice a day with no account at all. Paid plans are planned from $9 a month and are not on sale yet. That is deliberate: free tiers get abused and everyone's processing gets slower. But if your budget is genuinely zero, BypassGPT's 150 free words a month, WriteHuman's 3 free requests, or QuillBot's free paraphraser will serve you better than we will.
If you want the cheapest yearly price, that is Undetectable.ai. At roughly $5 per month billed annually it undercuts us, and it is the most established tool in the category with a broader feature surface. It gives you 10,000 words a month against our 15,000 at $9, so read those two numbers together and decide which side of the trade you are on.
If you are building on top of a humanizer, look hard at WriteHuman. It is the only tool here shipping MCP access alongside a REST API, which means an AI agent can call it directly as a tool. That is genuinely ahead of the rest of us on integration.
If you want a whole writing suite, QuillBot wins easily. Grammar, paraphrasing, citations, summarizing, 23 languages. It is a very good writing tool that includes a humanizer. It is not built to clear detectors, and you should not buy it expecting that.
And a warning about pages like this one. Roughly half the results on page one for "best AI humanizer" are listicles published by humanizer vendors, and every one of them ranks its own product first. We are a vendor too, which is exactly why this page tells you where the others beat us and why we published the prices we could not verify as unverified. Test the tools yourself; that is the only comparison that is not somebody's marketing.
If your work is headed for a university submission portal, the shortlist is different. Academic writing runs into per-request word caps, citation handling and a detector you cannot pre-check, so we narrowed this comparison down to the tools people actually buy for that job in the best AI humanizer for Turnitin.
If the detector you keep failing is GPTZero, you can settle this yourself. GPTZero is free and takes a paste, so every vendor claim on this page is checkable in a second tab, which is not true of Turnitin. We ran the same six tools through that lens in the GPTZero humanizer comparison.
If you write commercially, the checker pointed at you is probably Originality.ai. It is the tool agencies and publishers buy, it scans whole websites by URL rather than one submission, and it returns readability and plagiarism results in the same report, so a rewrite that lifts one number can wreck another. We compared the same six tools on that job, with Originality.ai's own credit pricing worked out per 1,000 words, in the Originality AI humanizer comparison.
If the scan happened without you knowing about it, that was probably Copyleaks. It runs inside the LMS, a browser extension and a Google Docs add-on, it returns an AI percentage and a similarity score from the same submission, and it advertises the lowest false-positive rate in the category, which is why the person holding the report treats it as settled. We took the same six tools through that specific problem, with its unified credit pricing worked out per 1,000 words, in the Copyleaks humanizer comparison.
If the checker that flagged you was Grammarly, the answer depends on which Grammarly you mean. Grammarly runs two different systems and buyers routinely confuse them. The AI detector is a free statistical guess on finished text, and a rewrite moves it. Authorship is a recording of how the document was written, typed against pasted against generated, and nothing sold on this page touches it. Which one is pointed at you decides whether you should buy anything at all, so we set both out, with the free-checker pre-check protocol, in the Grammarly AI detector and humanizer guide.
And if you have stopped believing any of it, start with what you can verify. The reason this search is full of Reddit threads is that Turnitin, the detector behind most of the outcomes people care about, licenses to institutions rather than individuals, so nobody outside one can test a vendor claim against it. GPTZero and ZeroGPT can be run free, which makes the whole question checkable in about ten minutes on a paragraph you wrote yourself. We published that procedure, plus what each vendor lets you confirm before paying, on which AI humanizer actually works.
Good questions
Questions people ask when choosing a humanizer
What is the best AI humanizer?
There is no single best AI humanizer for everyone, because the tools optimize for different buyers. For output you can check, pick one that shows a score and says what it measured. For the cheapest yearly price, Undetectable.ai runs about $5 per month annually. For a free test, BypassGPT gives 150 words a month.
Which AI humanizer actually works?
Any competent humanizer will lower a detector score, because they all rewrite the perplexity and burstiness patterns detectors measure. The ones that "actually work" do it without wrecking your sentences or changing your facts. Test that yourself: paste a paragraph where the details matter and check every number and claim survived.
How much does an AI humanizer cost?
Entry plans run about $9 to $20 per month billed monthly, dropping to roughly $5 to $12 billed yearly. Unlimited-word tiers land between $19 and $59. Most tools meter by monthly words, though WriteHuman meters by request instead, which is cheaper if you humanize a few long documents.
Is there a free AI humanizer?
Several tools have a free tier, but they are demos rather than plans. BypassGPT gives 150 words a month, WriteHuman gives 3 requests at 250 words, QuillBot caps its humanizer at 125 words and 6 uses a day, and Undetectable.ai offers a 250-word trial. Enough to judge output quality, not enough to publish with.
Do AI humanizers bypass Turnitin?
A good humanizer rewrites the statistical signals an AI-writing score is computed from, and Turnitin reads the same surface as the rest. What it does to your Turnitin number is not something anyone outside your institution can observe, so nobody, ourselves included, can answer that half honestly. Whether you should submit AI-assisted work is a separate question that software does not answer. The defensible use is clearing a false positive on writing you did yourself.
What should I look for in an AI humanizer?
Five things: meaning preserved exactly, a rewrite that rebuilds sentences instead of swapping synonyms, a score that tells you what it measured, tone control, and a specific, checkable answer about what happens to your text. Ours is that we store your runs so your history is there, you can delete any of them, and everything left is deleted after 90 days. Price matters least. A cheap tool that mangles your writing costs you more in editing time.
Is using an AI humanizer for schoolwork cheating?
It depends what you use it for. Clearing a false AI-writing flag on a paper you wrote yourself is a defensible use, since detectors are known to misfire on genuine human writing. Using it to disguise fully AI-generated work you are submitting as your own is a different call that software cannot make for you, and it is worth checking your institution's policy either way.
Go deeper
Related reading
Do AI humanizers work?
What they actually change about your text, and where they fail.
Are AI detectors accurate?
How they work, and how often they get it wrong.
For content teams
What changes when a whole team publishes AI-assisted work.
Best humanizer for Turnitin
The same comparison, narrowed to academic submissions.
Do not take our word for it, run the test
Paste a real paragraph, watch the gauge, and check your facts survived. That is the only comparison that tells you anything.
Meaning kept · Your own text rewritten · Saved to your history, delete any time