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 one pass clears every detector, and whether you can see the score or just have to trust it.
Here is what each tool costs, what it does well, and where it loses. Including where we lose.
Your text is never stored or used to train models.
Cleared. Reads 100% human.
Before · flagged as AI
After · reads human
Meaning kept · 5 detectors, one pass · Never stored or used for training
The short answer
There is no single best AI humanizer, because the leading tools optimize for different buyers. For a rewrite you can verify rather than trust, pick a tool that shows a live detection score in the interface, which is what Undetected.ai is built around, from $9 per month for 15,000 words. 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 2026. Every price here was read off the vendor's own pricing page on July 14, 2026, in USD. Two of them we could not verify, 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) | 15,000 words/mo on Starter. Unlimited on the $39 plan. | No free plan | Yes, on the Team plan | 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 | Not shown before checkout | Unlimited humanizations, 5,000 words per process on the Unlimited plan. | Free CTA, limit not published | 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
A live detection gauge and a pass badge per detector, so you watch the score clear instead of trusting a message. One pass is tuned against all five major detectors together.
Best for: Writers and teams who want the rewrite verified on screen.
From: $9/mo yearly ($12 monthly).
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 its own models rather than reselling a general LLM, and bundles a plagiarism check and content generator. Its pricing page would not render a price for us in July 2026.
Best for: Heavy-volume writers who want a flat-rate unlimited plan.
From: Not shown before checkout.
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 visible detection gauge turns that into something you can verify before you publish, and if you are handing work to a client, a score you can point at ends the argument before it starts. This 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. A trustworthy tool says plainly that it does not store your text or use it to train models. Read that line 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
If you want a free plan, we do not have one. Every Undetected.ai plan is paid, starting at $9 per month. 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.
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 verify, pick one that shows a detection score on screen. 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 lowers Turnitin's AI-writing score the same way it lowers any detector's, since the underlying statistical signals are similar. 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, coverage of every major detector in one pass, a visible detection score, tone control, and a clear statement that your text is not stored or used for training. Price matters least. A cheap tool that mangles your writing costs you more in editing time.
Go deeper
Related reading
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 · 5 detectors, one pass · Never stored or used for training