What is the best AI humanizer in 2026?

There is no single answer that can be honestly defended, which is why this page ranks on published limits rather than naming a winner. On free words per single request the order is set out above. On price per word GPTHuman leads. On free volume StealthWriter leads. Those are different questions with different answers.

Why is there no accuracy or bypass-rate ranking here?

Because no reproducible public benchmark exists. Detectors change without notice, disagree with each other on identical text, and every published bypass rate was produced by a company selling the tool it tested. A ranking built on those numbers would look more rigorous than this one and be worth less.

Where does HumanFlow place, and who wrote this?

We wrote it, and we are one of the eighteen tools on it. On the primary measure — free words accepted in a single request — HumanFlow places first at 1,500. We have deliberately not built a weighted composite score, because choosing the weights is precisely where a vendor's thumb goes on the scale.

Which AI humanizer has the best free plan?

It depends which number you mean. StealthWriter gives the most total free capacity — 10 rewrites a day at up to 1,000 words. Grammarly's humanizer is free with no stated cap at all. HumanFlow takes the most words in one request at 1,500. Three tools, three defensible answers.

QuillBot Premium at $8.33 a month billed annually, though it is a writing suite rather than a dedicated humanizer. Among dedicated humanizers GPTHuman is cheapest at $8.25 a month annually for 25,000 words. Both undercut HumanFlow's $10.80.

Should I trust a vendor that guarantees beating AI detectors?

Treat it as marketing. Such a guarantee is a promise about the future behaviour of systems the vendor neither controls nor observes. Two tools on this page make claims of that shape, and the table marks them, because a claim you cannot check is information about the vendor rather than the product.

How often are these figures updated?

Every figure was read from the vendor's own pricing page: 2 on 27 July 2026, 8 on 4 August, 2 on 15 August and 5 on 16 August. Pricing in this category changes often. Each tool links to its full comparison, where the source URL and capture date are listed.

Is this list sponsored or affiliate-funded?

No. There are no affiliate links on this page and no vendor paid to appear. We compete with every tool listed, which is a conflict of interest that no disclosure fully cures — the mitigation is that every figure here is checkable against the vendor's own page in about five minutes.

The best AI humanizer, ranked on what you can verify

Eighteen tools, ordered by how many free words each accepts in a single request, with entry price as the tiebreak. Every figure was read from the vendor's own pricing page. There is no accuracy ranking here and no bypass rates, because no reproducible public measurement of either exists — including one we could run ourselves.

Reviewed 16 August 2026 · written by HumanFlow, which is one of the eighteen

The methodology, in full

Most "best AI humanizer" lists rank by output quality or by how reliably a tool gets past detectors. Neither is measurable from outside the vendor, so this one does not attempt it. What follows is the complete rule.

Primary: free words per single request. The number that decides whether a real document goes through in one pass, and the limit people hit first.
Tiebreak: entry price. Cheapest paid plan, monthly, in USD.
Reported but not scored: free plan shape, annual price, and each vendor's public position on detector claims.

There is deliberately no composite score. Folding four criteria into one number requires choosing weights, and choosing weights is exactly where a vendor ranking itself puts its thumb on the scale. A single stated rule with the other columns shown separately is harder to rig and easier for you to overrule.

HumanFlow is ranked by the same rule as everything else and places first on it. We are not claiming to be the best humanizer — we are claiming to accept the most free words in one request, which is a fact you can check and a much smaller claim. Our editorial policy covers the conflict of interest.

The ranking

#	Tool	Free / request	Entry / mo	Free plan
1	HumanFlow	1,500 words	$18	2,000 words / mo, ongoing
2	StealthWriter	1,000 words	$20	10 humanizations a day and 10 AI scans a day
3	Walter Writes	300 words	$8	300-word trial, no card or login
4	GPTHuman	300 words	$15	300-word trial
5	Phrasly	300 words	Not published	300 humanization words
6	Undetectable.ai	250 words	$9.99	250-word trial
7	Ryne	250 words	$29.99	100 Ryne coins (Amethyst), English only
8	WriteHuman	250 words	Not published	3 requests / month
9	QuillBot	125 words	Not published	125 words per paraphrase; humanizer 125 words, 6 uses a day
10	GPTinf	120 words	$4.99	240 words total — 120 without an account, 120 more after signing up
11	Humanize AI Pro	100 words	Not published	500 words, once, with a 100-word request cap and no card required
12	BypassGPT	80 words	$12	150 words / month
13	Twixify	Not stated	$8	A free trial is offered on every plan; no terms are stated on the pricing page
14	Humbot	Not stated	$11.99	Free plan available; API trial 250 words
15	Netus AI	Not stated	$14	500 AI Bypasser words a month from 50 credits, with unlimited use of their detector
16	HIX Bypass	Not stated	$14.99	Free plan available
17	AI Humanize	Not stated	$15	None stated on their pricing page
18	Grammarly	Not stated	$30	Free humanizer and free AI detector, no account needed

"Not stated" means the vendor does not publish a free per-request cap. It is left blank rather than estimated, and those tools sort to the bottom of the primary measure because an unstated limit cannot be planned around.

What each vendor claims about detectors

Reported, not scored. A vendor's posture on detector claims tells you something about how it will treat you on everything else, but it is a judgement and we are not going to launder a judgement into a ranking position.

Tool	Detector claim	Publishes monthly price	States free cap
HumanFlow	States it is not for bypassing detectors	Yes	Yes
StealthWriter	Makes no bypass claim	Yes	Yes
Walter Writes	Not audited	Yes	Yes
GPTHuman	Advertises a bypass guarantee	Yes	Yes
Phrasly	Advertises bypassing named detectors	No	Yes
Undetectable.ai	Not audited	Yes	Yes
Ryne	Advertises bypassing named detectors	Yes	Yes
WriteHuman	Makes no bypass claim	No	Yes
QuillBot	Makes no bypass claim	No	Yes
GPTinf	Advertises a bypass guarantee	Yes	Yes
Humanize AI Pro	Advertises bypassing named detectors	No	Yes
BypassGPT	Advertises bypassing named detectors	Yes	Yes
Twixify	Advertises a bypass guarantee	Yes	No
Humbot	Not audited	Yes	No
Netus AI	Makes no bypass claim	Yes	No
HIX Bypass	Not audited	Yes	No
AI Humanize	Makes no bypass claim	Yes	No
Grammarly	States it is not for bypassing detectors	Yes	No

Five of these postures were verified against the vendor's own page. The rest read "not audited" because we have not checked them, and filling that column by inference would undo the point of the page.

The eighteen, in brief

In ranked order. Every figure below appears on the vendor's own pricing page, and each name links to the full head-to-head with its source and capture date.

1. HumanFlow — ours

Free: 2,000 words / mo, ongoing · Entry: $18 ($10.80 annual)

Sentence-level detection and 3 tones, 1,500 free words per scan and 5,000 on the $18 plan. No extension, no mobile app, API in private beta.

Choose it if you work on long documents and want to see which sentences read as machine-written rather than one document score.

2. StealthWriter

Free: 10 humanizations a day and 10 AI scans a day · Entry: $20 ($16.67 annual)

The most generous free tier here — 10 rewrites a day at 1,000 words, with sentence-level detection.

Choose it if you want the most free capacity available anywhere in this category, or you want control over rewrite strength and per-sentence alternatives.

3. Walter Writes

Free: 300-word trial, no card or login · Entry: $8

$8/mo for 30,000 words with a live API, Chrome extension, iOS and Android apps and a free MCP connector.

Choose it if you want an integration — API, extension, mobile, MCP — or simply the cheaper plan with more words. For most buyers comparing these two on features, this is the right answer.

4. GPTHuman

Free: 300-word trial · Entry: $15 ($8.25 annual)

Among the cheapest per word at its entry tier, 50+ languages, and an advertised guarantee to bypass all detectors.

Choose it if you need volume cheaply, you write in a language other than English, or you want an unlimited plan — and you are comfortable with a vendor that guarantees detector outcomes.

5. Phrasly

Free: 300 humanization words · Entry: Not published ($10.99 annual)

One unlimited plan at $10.99 a month billed annually, 5,000 words per request, with a publicly priced API.

Choose it if you write at volume and the unlimited plan holds up for your usage, or you need a public API today at a published per-word rate.

6. Undetectable.ai

Free: 250-word trial · Entry: $9.99 ($5 annual)

Tied cheapest annual plan in the category with Twixify, plus a Chrome extension and image and PDF checking.

Choose it if you want one of the two lowest annual prices in the set — $60 a year, matched by Twixify — or you need a browser extension, or to check images and PDFs as well as text.

7. Ryne

Free: 100 Ryne coins (Amethyst), English only · Entry: $29.99 ($19.99 annual)

Coin-metered with rollover and unlimited volume from its second tier; multi-language.

Choose it if you write in more than one language, you want unlimited volume and are willing to pay $29.99 a month for it, or coin rollover suits an irregular workload.

8. WriteHuman

Free: 3 requests / month · Entry: Not published ($12 annual)

Request-metered rather than word-metered, with output variations, image scanning and an unlimited top tier.

Choose it if you want unlimited requests, several output variations to choose between, or image scanning — and you tend to paste close to the per-request cap.

9. QuillBot

Free: 125 words per paraphrase; humanizer 125 words, 6 uses a day · Entry: Not published ($8.33 annual)

A paraphrasing suite with citations, grammar and 23-language support; humanizing is one feature among many.

Choose it if you want one subscription covering paraphrasing, grammar, citations and translation, you write in a language other than English, or you want a browser extension.

10. GPTinf

Free: 240 words total — 120 without an account, 120 more after signing up · Entry: $4.99

A low-priced humanizer with a bundled paraphraser and plagiarism checker, which guarantees bypassing all AI detectors without exception.

Choose it if You want the lowest entry price in this comparison at $4.99, or you want the bundled paraphraser and plagiarism checker, and their detector guarantee does not trouble you.

11. Humanize AI Pro

Free: 500 words, once, with a 100-word request cap and no card required · Entry: Not published ($5.83 annual)

An annual-only rewriter with a Chrome extension on every plan, a 500-word one-time free tier, and bypass sold as three ascending product tiers.

Choose it if You want a browser extension, you are comfortable paying for a year up front, and the promotional pricing holds long enough to matter.

12. BypassGPT

Free: 150 words / month · Entry: $12 ($8 annual)

Low entry price with three exposed rewrite modes; advertises bypassing named detectors.

Choose it if you are comfortable with a vendor that advertises bypassing specific named detectors — but not for the price, since its $12 monthly and $8 annual are both beaten by several tools here.

13. Twixify

Free: A free trial is offered on every plan; no terms are stated on the pricing page · Entry: $8 ($5 annual)

A request-metered rewriter aimed at matching your own tone of voice, which prints "bypass ALL AI-Detectors" on every plan and sells watermark removers alongside it.

Choose it if You rewrite in long batches, you would fill most of your requests close to the cap, and their bypass claim does not trouble you.

14. Humbot

Free: Free plan available; API trial 250 words · Entry: $11.99 ($7.99 annual)

A ten-tool bundle — plagiarism, grammar, summarising, translation — built around a humanizer.

Choose it if you want a bundle of writing tools in one subscription at a low annual price — $7.99 a month, though four tools here start lower.

15. Netus AI

Free: 500 AI Bypasser words a month from 50 credits, with unlimited use of their detector · Entry: $14 ($8.08 annual)

A credit-metered suite whose rewriter, branded AI Bypasser, draws on one shared credit pool with the rest of its toolset. 36 languages, both billing states published.

Choose it if You write in a language other than English, or you would genuinely use several tools in their suite, or you want the most words per dollar in this comparison and can budget credits across a bundle.

16. HIX Bypass

Free: Free plan available · Entry: $14.99 ($9.99 annual)

50+ languages and a public API, with a 3,000-word request cap at entry.

Choose it if you write in languages other than English, need an API, or want a lower entry price.

17. AI Humanize

Free: None stated on their pricing page · Entry: $15 ($6 annual)

One of the cheapest per word in this set, at 15,000 words for $6 a month billed annually, with a 500-word request cap on the entry plan and no free tier.

Choose it if Cost per word is the deciding factor and your documents are short, or you want unlimited monthly volume for $20 a month and can live without a free tier to test first.

18. Grammarly

Free: Free humanizer and free AI detector, no account needed · Entry: $30 ($12 annual)

A free AI humanizer and free AI detector inside a full writing assistant, with an explicit no-bypass position.

Choose it if you want a free humanizer, you write in more than one language, you want it inside the apps you already use, or you want grammar and clarity correction as well. For most people reading this page, that is the right answer.

Different questions, different winners

The table above answers one question. Here are the others, because "best" resolves differently depending on what you are actually buying.

Most free capacity: StealthWriter. Ten rewrites a day at up to 1,000 words each is more free throughput than any paid entry plan on this page provides in a month. If you are a student on a budget, start there and ignore the rest of this list until it stops fitting.

Free with no stated cap at all: Grammarly. Its humanizer and its AI detector are both free, and the humanizer page states outright that the tool is not intended to bypass AI detectors — a firmer public position than most of this category takes, including the wording we use ourselves.

Cheapest per word at entry: Walter Writes, at $8 a month billed annually for 30,000 words — about $0.00027 a word. Humanize AI Pro and GPTHuman follow. GPTinf has the lowest entry price in the table at $4.99, which is a different question: at 5,000 words it works out near $0.001 a word, roughly four times Walter Writes. Two of those three also advertise guarantees to bypass AI detectors, which is the kind of claim no vendor can support. All of it is true at once.

Most tools for the money: QuillBot at $8.33 a month billed annually, covering paraphrasing, citations, grammar, summarising and translation. Its humanizer caps free use at 125 words, which is the trade.

Longest single document: HumanFlow, at 1,500 free words per scan and 5,000 on the $18 plan. That is the measure this page ranks on and the one we happen to lead, which is why the rule is printed above the table rather than below it.

Best for languages other than English: GPTHuman and HIX Bypass both list 50+ languages. HumanFlow is English-only and has no plans to change, so for a large share of readers this list ends there.

Detector-pass testing — results pending

The obvious missing column is how each tool's output actually behaves against detectors. We are not filling it with numbers we cannot stand behind, and we are not reprinting vendors'. The table below is the shape of the test we intend to publish, left empty until we have run it under a protocol anyone can repeat.

Tool	Samples	Detectors	Result
HumanFlow	—	—	Pending
StealthWriter	—	—	Pending
Walter Writes	—	—	Pending
GPTHuman	—	—	Pending
Phrasly	—	—	Pending
Undetectable.ai	—	—	Pending
Ryne	—	—	Pending
WriteHuman	—	—	Pending
QuillBot	—	—	Pending
GPTinf	—	—	Pending
Humanize AI Pro	—	—	Pending
BypassGPT	—	—	Pending
Twixify	—	—	Pending
Humbot	—	—	Pending
Netus AI	—	—	Pending
HIX Bypass	—	—	Pending
AI Humanize	—	—	Pending
Grammarly	—	—	Pending

For this to be worth publishing it needs a fixed corpus, named detector versions with test dates, identical settings across tools, and raw results released alongside the summary. Anything less is the thing we are criticising. Until then this section stays empty, and a competitor's filled-in version of it is not better evidence than our blank one — here is why.

How to evaluate one of these yourself

Four checks, in the order they save you the most time. None needs a subscription.

1. Find the per-request cap before the monthly total. Entry-tier caps in this set run from 500 words to 5,000. The monthly number is what marketing leads with; the per-request number is what you hit on a Tuesday afternoon with a 2,000-word draft.

2. Work out the price per word, not the price. A $12 plan with 5,000 words is dearer per word than an $18 plan with 25,000. Divide before you compare, and do it at the tier you would actually buy rather than the headline one.

3. Test at length, not at 200 words. Every tool here handles a paragraph well. Problems appear past roughly 1,200 words, where repeated connectives, uniform sentence length and flattened emphasis start to show — the exact patterns that made the draft read as machine-written to begin with. A free tier that only permits short samples cannot answer the question you are asking.

4. Read the privacy policy for retention, not for reassurance. Three questions: is your text stored, for how long, and does it train a model. We have not audited the other vendors' policies and are not going to summarise ten documents we have not read — but it is a five-minute check per tool and it is the one people skip. Ours is here and what we do with your text is here.

Where HumanFlow honestly sits

We place first on this page's primary measure and we wrote the page, so the reasonable response is scepticism. Here is what that first place does and does not mean.

It means HumanFlow accepts more free words in a single request than the other ten — 1,500 against a range running from 80 to 1,000, with two vendors not stating a figure at all. That is checkable in a few minutes.

It does not mean our output is better. We have no evidence for that claim and neither does anyone else in this market, which is the entire argument of this page. Nor are we cheapest: sixteen tools here undercut our $18 entry price. Nor most generous overall: StealthWriter gives away far more free capacity than we do. Nor most capable: 3 tones (natural, casual and professional) with no custom voice is a thinner offering than QuillBot's nine modes or Grammarly's four voices plus custom profiles. We have no browser extension, no shipped mobile app, and our API is in private beta with no public endpoint.

HumanFlow does not promise to beat any detector — nobody honestly can. What we sell is a rewriter with a published per-scan ceiling and a detector that shows you which sentences it flagged rather than one number. Plans and prices · the editor · every head-to-head comparison.

Common questions

What is the best AI humanizer in 2026?: There is no single answer that can be honestly defended, which is why this page ranks on published limits rather than naming a winner. On free words per single request the order is set out above. On price per word GPTHuman leads. On free volume StealthWriter leads. Those are different questions with different answers.
Why is there no accuracy or bypass-rate ranking here?: Because no reproducible public benchmark exists. Detectors change without notice, disagree with each other on identical text, and every published bypass rate was produced by a company selling the tool it tested. A ranking built on those numbers would look more rigorous than this one and be worth less.
Where does HumanFlow place, and who wrote this?: We wrote it, and we are one of the eighteen tools on it. On the primary measure — free words accepted in a single request — HumanFlow places first at 1,500. We have deliberately not built a weighted composite score, because choosing the weights is precisely where a vendor's thumb goes on the scale.
Which AI humanizer has the best free plan?: It depends which number you mean. StealthWriter gives the most total free capacity — 10 rewrites a day at up to 1,000 words. Grammarly's humanizer is free with no stated cap at all. HumanFlow takes the most words in one request at 1,500. Three tools, three defensible answers.
Which is cheapest?: QuillBot Premium at $8.33 a month billed annually, though it is a writing suite rather than a dedicated humanizer. Among dedicated humanizers GPTHuman is cheapest at $8.25 a month annually for 25,000 words. Both undercut HumanFlow's $10.80.
Should I trust a vendor that guarantees beating AI detectors?: Treat it as marketing. Such a guarantee is a promise about the future behaviour of systems the vendor neither controls nor observes. Two tools on this page make claims of that shape, and the table marks them, because a claim you cannot check is information about the vendor rather than the product.
How often are these figures updated?: Every figure was read from the vendor's own pricing page: 2 on 27 July 2026, 8 on 4 August, 2 on 15 August and 5 on 16 August. Pricing in this category changes often. Each tool links to its full comparison, where the source URL and capture date are listed.
Is this list sponsored or affiliate-funded?: No. There are no affiliate links on this page and no vendor paid to appear. We compete with every tool listed, which is a conflict of interest that no disclosure fully cures — the mitigation is that every figure here is checkable against the vendor's own page in about five minutes.

Sources

Every figure came from the vendor's own pricing or product page. Each tool's comparison page lists its source URL and the date it was read: StealthWriter, Walter Writes, GPTHuman, Phrasly, Undetectable.ai, Ryne, WriteHuman, QuillBot, GPTinf, Humanize AI Pro, BypassGPT, Twixify, Humbot, Netus AI, HIX Bypass, AI Humanize, Grammarly. Figures read from vendor pricing pages — 2 on 27 July 2026, 8 on 4 August, 2 on 15 August and 5 on 16 August.