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 eleven 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 — five on 27 July 2026, the rest on 4 August 2026. 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

Eleven 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 4 August 2026 · written by HumanFlow, which is one of the eleven

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	BypassGPT	80 words	$12	150 words / month
11	Humbot	Not stated	$11.99	Free plan available; API trial 250 words
12	HIX Bypass	Not stated	$14.99	Free plan available
13	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
BypassGPT	Advertises bypassing named detectors	Yes	Yes
Humbot	Not audited	Yes	No
HIX Bypass	Not audited	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 eleven, 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)

Cheapest per word at volume, 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)

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

Choose it if you want the lowest annual price, need a browser extension, or need 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. 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 want the cheapest entry price and you are comfortable with a vendor that advertises bypassing specific named detectors.

11. 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, or the lowest possible entry price.

12. 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.

13. 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: GPTHuman, at $8.25 a month billed annually for 25,000 words. It also advertises a guarantee to bypass all AI detectors, which is the kind of claim no vendor can support. Both facts are 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
BypassGPT	—	—	Pending
Humbot	—	—	Pending
HIX Bypass	—	—	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: five 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 eleven 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 — five on 27 July 2026, the rest on 4 August 2026. 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, BypassGPT, Humbot, HIX Bypass, Grammarly. Figures captured 27 July 2026 and 4 August 2026.