Best AI detector and humanizer in one tool
The table lists the nine in order of the largest humanizer request the cheapest paid plan or free tier accepts, largest first, because the humanizer is the part you pay for and the detector is a check you can get free elsewhere. The last column records what the vendor states about its own detector, in the vendor's words. Humanizer plan facts were checked on 8 November 2026 and the detector statements read on 9 November 2026.
Whichever you choose, run the output through a detector the vendor does not own before you rely on the label.
Why is the best AI detector and humanizer pairing still two separate questions?
Because the same company built both halves. A humanizer vendor can tune its rewrite against its own checker until the checker says human, and nothing outside the company has tested either half. The result is a label a customer cannot verify: the checker is a product feature, not a measurement, and no vendor on this page publishes a dataset, a date or an outside audit for its built-in detector. WriteHuman's own detector page comes closest to candour, stating that no detector on the market is fully accurate and that short snippets fall below a useful threshold, read 9 November 2026.
The peer-reviewed record shows why an outside reading is the one that counts. Weber-Wulff and colleagues tested 12 public detectors plus Turnitin and PlagiarismCheck on human, machine, machine-paraphrased and machine-translated text, found that all 14 scored below 80 percent on their accuracy measure, and found that the tools disagreed with each other on the same texts, with paraphrasing lowering performance further (Weber-Wulff et al. 2023, International Journal for Educational Integrity, read 9 November 2026). Sadasivan and colleagues showed that a paraphrasing step lowered the accuracy of the detectors they tested, including watermark-based ones, and framed paraphrasing as an attack on detection in general (Sadasivan et al. 2023, arXiv 2303.11156, read 9 November 2026).
| What a built-in checker gives you | What it cannot give you | Where the method on this site gets it instead |
|---|---|---|
| A label from the same vendor's model | A label from a model the vendor does not control | Five detectors no humanizer vendor here owns |
| A reading on today's version | A dated reading you can compare later | Run date on every reading, with a screenshot |
| A verdict on the output alone | The change from the input's own reading | Every input scanned before any tool touches it |
| One vendor's threshold | The detector's own published threshold | Pass counted only on each detector's own human label |
Two detectors disagreeing on the same text is the normal case, not the exception. That line is the reason this page cannot rank the nine tools by their own checkers and will not.
What does each vendor say its detector does?
The statements below are each vendor's own, read on its site on 9 November 2026, and none is a measurement this site has checked.
| Tool | Vendor's statement about its detector | What the statement does not include |
|---|---|---|
| Phrasly | A free, unlimited AI checker with no sign-up; 99.8 percent accuracy claimed on its detector page | A dataset, a date or a method for the 99.8 percent figure |
| HIX Bypass | A scan that estimates the likelihood of being flagged by mainstream detectors | Which detectors, or any rate |
| StealthGPT | A 0 to 100 AI score for teachers and platforms; a dashboard estimate of how top detectors read text | A dataset or false positive rate |
| GPTHuman | A built-in detector to run output through after humanizing | Any accuracy figure |
| Walter Writes AI | A free detector for ChatGPT, Claude and Gemini text with an AI probability score | Any accuracy or false positive figure on the page read |
| WriteHuman | A free detector; states no detector is 100 percent accurate; names a 150-word floor | A dataset or rate for its own tool |
| Undetectable AI | Analyses text as a detector would and flags likely parts | Which detector model it imitates, or any rate |
| Grammarly | 99 percent detection accuracy and first place on the RAID benchmark | A link to the benchmark run or its date on the page read |
| BypassGPT | A free AI detector beside the humanizer | Any method or rate |
Grammarly and Phrasly are the two vendors of the nine that put a number on their detectors: Grammarly's is its own claim about an outside benchmark with no date for the run on the page read, and Phrasly's 99.8 percent is its own claim with no dataset or method on the page read, both 9 November 2026. ZeroGPT belongs in a footnote here: it is a detector that added a humanizer, and its humanizer page routes an Advanced option to Undetectable AI, read 9 November 2026, which is why this site keeps ZeroGPT as a detector in its method and covers the humanizer on the ZeroGPT page.
Why does this page rank nothing yet?
Because this site has published no run. The published method scans every output on five detectors no humanizer vendor on this page owns, GPTZero, Originality.ai, Copyleaks, Pangram and ZeroGPT, records each detector's own label on the run date with a screenshot, scans every input before humanizing so the change is visible, and has two editors rate meaning kept blind on a 1 to 5 scale. Meaning carries 35 of 100 points and detector readings 30, because a rewrite that drops a claim has done damage no checker will report.
Nine of the humanizers this site tracks also ship their own AI detector, confirmed on each vendor's site on 9 November 2026: Phrasly, Undetectable AI, Walter Writes AI, Grammarly, StealthGPT, WriteHuman, HIX Bypass, GPTHuman and BypassGPT. The best AI detector and humanizer in one tool saves a paste between two tabs and nothing more, because a vendor's own checker is not independent evidence about that vendor's rewrite; this page lists the nine on the same fields and ranks nothing by a score. The overall list is ranked humanizers this month and the other audiences sit in the best-for hub.
Updated
Short answer
9 of the humanizers this site tracks also ship their own AI detector, confirmed on each vendor's site on 9 November 2026: Phrasly, Undetectable AI, Walter Writes AI, Grammarly, StealthGPT, WriteHuman, HIX Bypass, GPTHuman and BypassGPT. A combined AI humanizer and detector saves a paste between two tabs, and that is all it saves: a vendor's own checker is not independent evidence about that vendor's rewrite, because the same company built the text and the verdict. This page lists the nine on the same fields, free tier, cheapest plan, request cap and named modes, with what each vendor states about its detector, and ranks nothing by a score; the independent detector columns of the published run will join the table when the first run publishes.
Which tools ship both an AI humanizer and an AI detector?
Mode names are the vendor's own. Price is reported, never ranked. The independent detector columns of the published run will be added to this table when the first run publishes. Phrasly's humanizer and pricing pages were read on 9 November 2026; its full plan facts are on the Phrasly review.
| Order | Tool | Best for | Main limitation | Free tier (humanizer) | Cheapest plan (checked on 8 November 2026) | Per-request cap | Named modes | Vendor's detector, as stated (read 9 November 2026) | Review |
|---|---|---|---|---|---|---|---|---|---|
| 01 |  Phrasly | A 5,000-word request with a free, unlimited checker in the same tool | One paid plan, billed for a year at once; the detector's 99.8 percent accuracy claim has no published test behind it | One free humanization a day, up to 500 words, no sign-up (read 9 November 2026) | Unlimited, $10.99 a month billed annually (read 9 November 2026) | 5,000 words (Unlimited); 500 free | Balanced, Strong, Max | "Free, unlimited" AI checker on the humanizer page, no sign-up; 99.8 percent accuracy claimed on the detector page | Review of Phrasly |
| 02 |  HIX Bypass | Long requests with a built-in scan on a small monthly pool | 5,000 words a month on Standard is a few documents; the scan estimates "mainstream" detectors, its own words | None stated | Standard, 5,000 words a month, $14.99 monthly or $9.99 a month yearly | 3,000 words | Fast, Aggressive, Latest | Scans text for "the likelihood of it getting flagged by the mainstream AI detectors" | Review of HIX Bypass |
| 03 |  StealthGPT | A large monthly pool with a 0 to 100 AI score | No free tier; $1 three-day trial; the highest list price here | None; $1 three-day trial | Pro, 50,000 words a month, $29.99 monthly | 1,000 words | Not stated on the pricing page | "A clear 0-100 AI score"; a dashboard feature that "estimates how top AI detectors" read text | Review of StealthGPT |
| 04 |  GPTHuman | A 1,000-word request on an entry plan with a built-in check | Trial is 300 words once; no modes named; the detector carries no published figure | 300-word trial | Starter, 25,000 words a month, $15 monthly or $8.25 a month billed $99 yearly | 1,000 words (Starter) | None named | "Best in class AI detector included"; tells users to run output through it | Review of GPTHuman |
| 05 |  Walter Writes AI | A strength setting per request and a free detector page | 750 words a request on Starter; the detector page states no accuracy figure | 300-word trial, no card | Starter, 30,000 words a month, $8 a month billed $96 yearly | 750 words (Starter) | Simple, Standard, Enhanced | A free detector for ChatGPT, Claude and Gemini text with an "AI probability" score | Review of Walter Writes AI |
| 06 |  WriteHuman | A few short pieces a month with a free detector that names its limits | 600 words a request on Basic; 3 free requests a month | 3 requests a month, 250 words each | Basic, 80 requests a month, $12 a month billed yearly or $20 monthly | 600 words (Basic) | Basic, Enhanced quality | "No detector on the market is 100% accurate"; snippets under about 150 words fall below a meaningful threshold | Review of WriteHuman AI |
| 07 |  Undetectable AI | Short texts on a small yearly budget with a built-in check | No request cap and no modes stated | 250 words in total | 10,000 words a month, $5.00 a month billed $60.00 yearly | Not stated | None named | "Analyzes your text the same way a detector would", flagging parts likely to be caught | Review of Undetectable AI |
| 08 |  Grammarly | A free detector and humanizer inside a grammar suite | Allowance counted in AI prompts, not words; no per-request figure | Free plan, 100 AI prompts a month | Paid plan priced in AI prompts | Not stated | Four preset voices, names not stated | States "99% detection accuracy" and a first place on the RAID benchmark, its own claim | Review of Grammarly AI Humanizer |
| 09 |  BypassGPT | Trying a tool and its checker on a short passage free | 80 words per input free; paid prices did not render for this check | 150 words a month, 80 words per input | Not read (paid tiers did not render on 8 November 2026) | 80 words free | Fast, Creative, Enhanced | A free AI detector on the same page as the humanizer | Review of BypassGPT |
Which humanizer and detector pairing should you choose?
One line per job. Each name links to its full review.
- Choose Phrasly if your documents run to 5,000 words, you want a free unlimited checker with no sign-up, and a yearly charge for the humanizer suits you.
- Choose HIX Bypass if you want a built-in scan before you leave the tool and your documents run to 3,000 words.
- Choose StealthGPT if you need a large monthly pool and want a 0 to 100 score on the same dashboard, and accept the highest list price here.
- Choose GPTHuman if you want a 1,000-word request on an entry plan and a built-in check.
- Choose Walter Writes AI if you want a strength setting per request and a free detector page, and your sections are under 750 words.
- Choose WriteHuman if you have two or three short pieces a month and want a detector that states its own limits.
- Choose Undetectable AI if a small yearly bill matters more than mode control.
- Choose Grammarly if your drafts already live there and a prompt-counted allowance suits you.
- Choose BypassGPT only to try a humanizer and checker on an 80-word passage before paying anyone.
How the ranking works
- Inputs
- 24 texts24 AI-written inputs across six genres plus 6 human-written controls, the same set for every tool.
- Detectors
- 5 namedGPTZero, Originality.ai, Copyleaks, Pangram and ZeroGPT.
- Weights
- Meaning kept35
- Errors introduced20
- Detector pass rate30
- Limits and access15
- Run date
The nine tools on the same fields
Every free tier gets the same fields, in rank order. The disc is the sample number it was poured under in the full run.
Sample 01: Phrasly
Phrasly's humanizer page states a "free, unlimited" AI checker with no sign-up beside the humanizer, and "one free humanization a day of up to 500 words, with no signup required", read on the Phrasly AI humanizer page on 9 November 2026. Its pricing page sells a $2.00 three-day trial with 1,000 humanization words at 800 per process and one paid plan, Unlimited, at $10.99 a month billed annually with 5,000 words per process, read the same day. The detector page claims 99.8 percent accuracy with no public test behind the figure, read 9 November 2026.
- Best for
- a 5,000-word request with a free, unlimited checker in the same tool.
- Main limitation
- the only paid plan is billed for a year at once, and the detector's accuracy claim is unsupported on the page.
- Free tier
- one humanization a day, up to 500 words, no sign-up, read 9 November 2026.
- Cheapest plan
- Unlimited, $10.99 a month billed annually, read 9 November 2026.
- Per-request cap
- 500 words free, 800 on the trial, 5,000 on Unlimited.
- Named modes
- Balanced, Strong, Max.
Sample 02: HIX Bypass
HIX Bypass, formerly at bypass.hix.ai, sells Standard at 5,000 words a month for $14.99 monthly or $9.99 a month billed yearly, with a 3,000-word request cap and three modes, Fast, Aggressive and Latest, checked on 8 November 2026. Its homepage states that it can scan text for the likelihood of being flagged by mainstream detectors, read 9 November 2026.
- Best for
- long requests with a built-in scan on a small monthly pool.
- Main limitation
- 5,000 words a month on Standard is a few documents, and the scan names no detector and no rate.
- Free tier
- none stated.
- Cheapest plan
- Standard, 5,000 words a month, $9.99 a month billed yearly, checked on 8 November 2026.
- Per-request cap
- 3,000 words.
- Named modes
- Fast, Aggressive, Latest.
Sample 03: StealthGPT
StealthGPT has no free tier, sells a $1 three-day trial, caps a request at 1,000 words and prices Pro at 50,000 words a month for $29.99 monthly, checked on 8 November 2026. Its homepage describes an AI detector that gives "a clear 0-100 AI score" and a dashboard feature that estimates how top detectors read a text, read 9 November 2026.
- Best for
- a large monthly pool with a 0 to 100 score on the same dashboard.
- Main limitation
- no free tier and the highest monthly list price on this page; the score's basis is not published.
- Free tier
- none; $1 three-day trial.
- Cheapest plan
- Pro, 50,000 words a month, $29.99 monthly, checked on 8 November 2026.
- Per-request cap
- 1,000 words.
- Named modes
- not stated on the pricing page.
Sample 04: GPTHuman
GPTHuman's trial is 300 words and its Starter plan gives 25,000 words a month for $15 monthly or $8.25 a month billed $99 yearly, with a 1,000-word request cap and no modes named, checked on 8 November 2026. Its homepage says a built-in detector is included and tells users to run their output through it, read 9 November 2026.
- Best for
- a 1,000-word request on an entry plan with a built-in check.
- Main limitation
- the trial is 300 words once, no modes are named, and the detector carries no published figure.
- Free tier
- 300-word trial.
- Cheapest plan
- Starter, 25,000 words a month, $8.25 a month billed $99 yearly, checked on 8 November 2026.
- Per-request cap
- 1,000 words on Starter.
- Named modes
- none named.
Sample 05: Walter Writes AI
Walter Writes AI documents three modes, Simple, Standard and Enhanced, and its Starter plan gives 30,000 words a month for $8 a month billed $96 yearly with a 750-word cap per request, checked on 8 November 2026. Its detector page states a free AI detector for ChatGPT, Claude and Gemini text with an AI probability score, and publishes no accuracy figure, read 9 November 2026.
- Best for
- a strength setting per request and a free detector page.
- Main limitation
- 750 words a request on Starter splits a long document, and the detector page gives no accuracy or false positive figure.
- Free tier
- 300-word trial, no card.
- Cheapest plan
- Starter, 30,000 words a month, $8 a month billed $96 yearly, checked on 8 November 2026.
- Per-request cap
- 750 words on Starter.
- Named modes
- Simple, Standard, Enhanced.
Sample 06: WriteHuman
WriteHuman's free plan allows 3 requests a month at 250 words each, and Basic gives 80 requests a month at 600 words each for $12 a month billed yearly or $20 monthly, checked on 8 November 2026. Its free detector page states that no detector on the market is 100 percent accurate and that snippets under roughly 150 words fall below the threshold where scores become meaningful, read 9 November 2026.
- Best for
- a few short pieces a month with a detector that states its own limits.
- Main limitation
- 600 words a request on Basic, and the free tier is three requests.
- Free tier
- 3 requests a month, 250 words each.
- Cheapest plan
- Basic, 80 requests a month, $12 a month billed yearly, checked on 8 November 2026.
- Per-request cap
- 250 free, 600 on Basic.
- Named modes
- Basic, Enhanced quality.
Sample 07: Undetectable AI
Undetectable AI's trial is 250 words in total and its entry plan is 10,000 words a month at $5.00 a month billed $60.00 yearly, with no request cap and no modes named on the pricing page, checked on 8 November 2026. Its homepage says the tool analyses text the way a detector would and flags the parts likely to be caught, read 9 November 2026.
- Best for
- short texts on a small yearly budget with a built-in check.
- Main limitation
- no mode control, no stated request cap, and a checker that names no detector model.
- Free tier
- 250 words in total.
- Cheapest plan
- 10,000 words a month, $5.00 a month billed $60.00 yearly, checked on 8 November 2026.
- Per-request cap
- not stated.
- Named modes
- none named.
Sample 08: Grammarly
Grammarly's humanizer is on its free plan, which counts allowances in AI prompts, 100 a month free, and its detector page states 99 percent detection accuracy and a first place on the RAID benchmark, all read on 9 November 2026. Grammarly prices AI prompts, not humanizer words.
- Best for
- a free detector and humanizer inside a grammar suite.
- Main limitation
- no word figure for the humanizer and no date on the page for the benchmark claim.
- Free tier
- free plan, 100 AI prompts a month.
- Cheapest plan
- paid plan priced in AI prompts; the price shown varies by country, read 9 November 2026.
- Per-request cap
- not stated.
- Named modes
- four preset voices, names not stated.
Sample 09: BypassGPT
BypassGPT's free tier is 150 words a month at 80 words per input, with three modes, Fast, Creative and Enhanced, checked on 8 November 2026, and its homepage offers a free AI detector beside the humanizer, read 9 November 2026; its paid prices load client-side and did not render, so no paid plan is stated here.
- Best for
- trying a humanizer and its checker on a short passage before paying anyone.
- Main limitation
- 80 words per input free is a few sentences, and the paid prices could not be read.
- Free tier
- 150 words a month, 80 words per input.
- Cheapest plan
- not read on 8 November 2026.
- Per-request cap
- 80 words free.
- Named modes
- Fast, Creative, Enhanced.
Why do lists of combined humanizer and detector tools disagree?
Because most of them report the vendor's own checker reading as if it were a test, and each vendor's checker is a different model with a different threshold and no published date. This page lists stated features and limits, which change only when a vendor edits a page, and the corrections log records each change. When the first run publishes, every tool here will carry readings from five detectors none of them owns, with the run date, each detector's own label, and the baseline reading for every input.
Questions about AI humanizers for humanizer and detector
What is the best AI detector and humanizer in one tool?
Nine tools tracked here ship both, confirmed on 9 November 2026: Phrasly, Undetectable AI, Walter Writes AI, Grammarly, StealthGPT, WriteHuman, HIX Bypass, GPTHuman and BypassGPT; none is ranked by a score yet, and the built-in detector of any of them is the vendor checking its own work.
Is a humanizer's built-in AI checker reliable?
It is not independent: the company that wrote the rewrite also wrote the verdict, so a human label from a built-in checker says nothing a reader can verify, and the figure that matters is a reading from a detector the vendor does not own, on a dated run.
Which AI checker and humanizer is free?
Phrasly's detector is free and unlimited with no sign-up beside one free humanization a day of up to 500 words, Grammarly's AI detector and humanizer are both on its free plan, WriteHuman and BypassGPT offer free AI detectors beside limited free humanizers, and Walter Writes AI's detector page states it is free, all read on 9 November 2026; the humanizer limits for each are in the table on this page.
Why do detectors disagree with each other?
Peer-reviewed testing found that detectors disagree because each is a different model trained on different data: Weber-Wulff and colleagues found all 14 tools they tested scored below 80 percent, and paraphrasing lowered performance further, read 9 November 2026.
Can a humanizer and detector from the same vendor be gamed?
A vendor can tune its humanizer against its own detector without any outside check, which is why Sadasivan and colleagues framed paraphrasing as an attack that lowers detector accuracy in general; whether a given pairing does so is a question only an outside detector can answer.
Which detectors does this site treat as independent?
The published method checks every output on five detectors no humanizer vendor on this page owns: GPTZero, Originality.ai, Copyleaks, Pangram and ZeroGPT, with the reading recorded from each detector's own screen on the run date.
Does ZeroGPT count as a detector and humanizer in one?
Yes in form: ZeroGPT is a detector that added a humanizer, and its humanizer page routes its Advanced option to Undetectable AI, read 9 November 2026, which is why this site keeps ZeroGPT as a detector in its method and lists its humanizer separately.
Is Phrasly a humanizer and detector in one?
Yes: Phrasly's humanizer page states a free, unlimited AI detector beside the humanizer and one free humanization a day of up to 500 words with no sign-up, read 9 November 2026; its Unlimited plan is $10.99 a month billed annually with 5,000 words per process.
Sources
- Weber-Wulff et al. 2023, read 9 November 2026: 14 tools below 80 percent; tools disagree; paraphrasing lowers performance
- Sadasivan et al. 2023, read 9 November 2026: Paraphrasing lowers detector accuracy; framed as an attack on detection
- Vendor homepages and detector pages, read 9 November 2026: Each vendor's statement about its own detector
- Vendor pricing and product pages, checked 8 November 2026: Humanizer plans, request caps and modes for all nine tools
- Phrasly AI humanizer page and Phrasly pricing, read 9 November 2026: Free unlimited checker, one free humanization a day, trial and Unlimited plan
Revision log
| Page published. |
Related reading
Best multilingual AI humanizerMultilingual AI humanizer claims compared: the count and the named list each of 13 vendors publishes, read.
AI humanizer for journalists: newsroom policies, provenance and what the tools keepAn AI humanizer for journalists is judged against the newsroom's AI policy first: what AP and the Guardian.
Best AI humanizer: 12 tools, one published methodBest AI humanizer by one published protocol: meaning kept, errors added, detector readings and plan limits.
Best AI humanizer by useBest AI humanizer by use: academic writing, work checked by Turnitin, content writing and more, each page.
Phrasly reviewPhrasly reviewed on the same fields as every humanizer we list: the free daily humanization, the $2 trial.