Prices re-read off undetectable.ai on October 5, 2026

Undetectable AI pricing and how much Undetectable AI costs per plan and per word

Undetectable.ai advertises a headline price of $5 a month. That number is real, and it is also the least useful figure on their pricing page, because what you actually pay depends on how many words you run.

Here is every published tier, the annual total, the cost per 1,000 words, and where four other tools come out cheaper. We build one of them, so the numbers are all sourced.

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The short answer

Undetectable AI costs $9.99 per month for 10,000 words, dropping to $5.00 per month if you pay a year up front at $60.00. The paid tiers above that are 20,000 words at $19.00 monthly or $9.50 yearly, 35,000 words at $31.00 or $15.75, and 50,000 words at $42.50 or $21.25, with a custom Business plan above that. There is no free plan, only a one-time 250-word trial. Its cost per 1,000 words runs from $0.50 down to $0.43 on annual billing, which makes it the cheapest way to buy a small volume of humanizing and one of the more expensive ways to buy a large one.

All figures in USD, re-read directly from undetectable.ai/pricing on October 5, 2026 (rendered page plus raw HTML) and unchanged since August. The top card now advertises "6 Months Free" on annual billing, which is the same 50 percent annual discount expressed a different way, not an extra saving. Promotional rates in this category change often, so confirm before you buy.

Every published tier

Undetectable AI plans, monthly versus annual, with the cost per 1,000 words

The per-word column is the one their pricing page does not show, and it is the one that decides whether a plan is good value for you.

Plan	Paid monthly	Paid yearly	Charged up front	Per 1,000 words (yearly)	Who it fits
10,000 words/mo	$9.99/mo	$5.00/mo	$60.00/yr	$0.50	One essay or a few blog posts a month
20,000 words/mo	$19.00/mo	$9.50/mo	$114.00/yr	$0.48	A steady coursework load or light freelance writing
35,000 words/mo	$31.00/mo	$15.75/mo	$189.00/yr	$0.45	A working content writer
50,000 words/mo	$42.50/mo	$21.25/mo	$255.00/yr	$0.43	A small content team, scaling up to 380,000 words
Business, custom volume	Custom quote	Custom quote	Not published	Not published	Agencies wanting non-expiring credits and white labeling

Paid monthly, the same tiers work out at $1.00, $0.95, $0.89 and $0.85 per 1,000 words. Annual billing is close to a half-price offer, which is why almost every screenshot of their pricing you will see online shows the yearly column.

What the numbers mean

Four things worth knowing before you pick a tier

The $5 price only exists if you commit to a year

The annual rate is charged as a single $60.00 payment, not $5.00 a month. That is a fine deal if you write consistently for twelve months, and an expensive one if you bought it for a single semester or one campaign. Pay monthly and the same tier is $9.99, which is exactly double per word. Decide which of those two situations you are actually in before the toggle decides for you.

The per-word price barely improves as you scale

Going from 10,000 to 50,000 words a month moves the rate from $0.50 to $0.43 per 1,000 words, a 14 percent improvement for five times the volume. Most software gets meaningfully cheaper per unit as you buy more. Here it stays close to flat, so a high-volume writer is paying a small-volume rate. That is the single biggest reason to compare tools by word count rather than by entry price.

The 250-word trial is a sample, not a free tier

You get one 250-word run to see what the output reads like. That is enough to judge whether the prose survives a rewrite, and it is not enough to finish anything. Treat it as a quality check: paste in a paragraph you know well, with a number and a named source in it, and see whether both come back intact. That test tells you more than any pricing table.

The guarantee covers humanization credits, not the plan

Undetectable.ai publishes a money-back guarantee worded as: if anything it produces is flagged as not human, it will refund the cost of humanization. Read that carefully. It is a credit-level promise about specific flagged output, not a blanket refund of a $60.00 or $189.00 annual charge. If you are buying annually on the strength of a guarantee, check the current terms yourself before you pay. The rest of what a subscription does and does not include, including the plan name that does not exist, is on our Undetectable AI Pro review.

If ZeroGPT's "Advanced Model" button sent you here

ZeroGPT's humanizer page labels its own tool the Basic Public Model and links its upgrade buttons to Undetectable AI. That upgrade is an Undetectable AI subscription on the tiers above, not a ZeroGPT plan, and paying ZeroGPT for Pro, Plus or Max does not include it. Our ZeroGPT humanizer review sets out what each company charges and who you would be paying.

In context

How Undetectable AI pricing compares with four other humanizers

Same question for each tool: what is the cheapest way in, how many words does that buy, and what does 1,000 words actually cost.

Tool	Cheapest paid plan	What that buys	Per 1,000 words	Free usage	Price checked
Undetectable.ai	$5.00/mo billed yearly ($9.99 monthly)	10,000 words/mo at entry, up to 380,000 on the top published tier	$0.50 down to $0.43	250-word trial	October 5, 2026
Undetected.ai	$24.00/mo billed yearly ($49 monthly)	100,000 words/mo on Starter, 300,000 on Pro, 1,000,000 on Scale	$0.24 on Starter, $0.16 on Pro	Trial: 3 runs of up to 300 words, once (no free plan)	Our current price
Walter Writes AI	$8.00/mo billed yearly ($96/yr)	30,000 words/mo, capped at 750 words per request	$0.27	300-word trial	August 19, 2026
WriteHuman	$12.00/mo billed yearly ($20 monthly)	80 requests/mo at up to 600 words each, so 48,000 words at best	$0.25 if you fill every request	3 requests/mo at 250 words	September 18, 2026
QuillBot Premium	$8.33/mo billed yearly ($19.95 monthly)	Unlimited paraphrasing, humanizer included in the suite	Not metered by word	125 words per paraphrase	July 16, 2026

Undetected.ai is our product. Every other row was read off that vendor's own pricing page on the date shown, and the per-word figures are ours, calculated from their published numbers.

Under about 15,000 words a month, Undetectable.ai is among the cheapest serious options. Five dollars a month buys 10,000 words from an established product with an API, unlimited detection checks and writing-level matching. If that is your volume, most of this comparison is academic, and we would rather tell you that than pretend otherwise. One caveat we added on August 30, 2026: Humanize AI now prices the same 10,000 words at $4.99 billed yearly, so this is no longer a one-horse race at the bottom of the market. It has no API on any tier and its entry plan cannot re-run your text, which is why we would still start here, but the gap is a penny rather than a reason. Checked again on September 9, 2026, the entry tier at Rewritify does not undercut either of them: $9 a month billed yearly buys 5,000 words, so it is roughly triple the price per word at the bottom of the market.

Above roughly 20,000 words a month the ranking inverts. Their 35,000-word tier costs $0.45 per 1,000 words. Walter Writes charges about $0.27 for 30,000 words, WriteHuman about $0.25 if you fill every request, and our Starter plan $0.24 for 100,000. A writer publishing 50,000 words a month pays roughly $189 a year at Undetectable.ai's 35,000 tier and still runs out of words, against $288 a year on our Starter plan, which costs more but covers 100,000 words a month.

Cheap per word is not the same as usable. Walter Writes caps each request at 750 words on its entry tier, so a 3,000-word article has to be split into four passes and stitched back together. WriteHuman's Basic plan meters 80 requests of up to 600 words, so its $0.25 figure only holds if you fill every single request to the limit. Read the per-request cap before the monthly total, because that is where these prices quietly stop being what they look like.

And the honest framing on our own row. We are more expensive than Undetectable.ai at the entry tier: $24 against $5, for 100,000 words against 10,000. That is ten times the words, so per 1,000 words our Starter is the cheaper of the two. What you get for the difference is that volume, plus a visible gauge and the reasons behind both numbers, so you can see what our score measured instead of trusting a confirmation message. Neither of us can show you a GPTZero or Turnitin verdict. Whether that is worth $19 a month is a judgement only you can make, and you can make it on the full head-to-head comparison rather than on this page alone.

Price is not the thing most buyers get wrong here. Undetectable.ai is cheap enough at the entry tier that cost is rarely the mistake. The mistake is assuming a 3.5 star average describes an average experience: its recent Trustpilot reviews split roughly half five star against 41 percent one star, so the score predicts very little about your own result. We took that distribution apart, along with the money-back guarantee and the Forbes badge on their homepage, in our review of whether Undetectable AI is legit. Read it before you pick annual over monthly.

Pick by volume

Work out your monthly word count first, then read the prices

Almost every bad purchase in this category comes from buying a headline price and discovering the word limit three weeks later.

Under 10,000 words a month

A student with two or three assignments a term, or a professional cleaning up the occasional report. Undetectable.ai's entry tier at $5.00 billed yearly is the best value on the market for this, provided you will still want it in twelve months. Paying monthly at $9.99 removes the commitment and doubles the per-word cost. If the writing in question is coursework, we set out what the volume actually looks like across a semester on our AI humanizer for students page.

10,000 to 30,000 words a month

A dissertation chapter cycle, a busy freelance month, a small blog. This is the band where the tools genuinely converge and the deciding factor stops being price. Compare per-request caps, whether your meaning survives a rewrite, and whether you can verify the result before you submit or publish.

30,000 words a month and up

Content teams, agencies and SEO operations. Undetectable.ai's published tiers stop being competitive here on a per-word basis, and its Business plan is quote-only, so you cannot compare it without a sales conversation. Flat or uncapped plans are usually the cheaper structure at this volume.

Bursty, not steady

If your work arrives in bursts, three heavy weeks then nothing for a month, monthly billing is worth the premium. Unused words do not roll over on most plans in this category, so an annual commitment sized for your busiest month is money you spend eleven times without using.

You need an API

Undetectable.ai lists API compatibility on all plans, which is unusually generous. Most vendors put programmatic access on a higher tier, and so do we: our API is part of Scale only. If you are building humanizing into a pipeline on a small budget, that makes this one of their genuine advantages; our endpoint and who else publishes an API are on the AI humanizer API page.

You are buying for a team

Shared word pools, seats and billing matter more than the per-word rate once more than one person is pasting text in. Undetectable.ai handles this through its custom Business plan with non-expiring credits and white labeling. We have no custom Business plan and no white labeling. Teams are a feature of our Pro plan (3 people) and Scale (10), each person with their own login on one shared allowance, and the humanizer for content teams page sets out how that works.

Good questions

Questions people ask about Undetectable AI pricing

How much does Undetectable AI cost?

Undetectable AI costs $9.99 per month for 10,000 words, or $5.00 per month if you pay for a year up front, which is billed as $60.00. Larger tiers run $19.00 per month for 20,000 words, $31.00 for 35,000 and $42.50 for 50,000, each roughly halving on annual billing. Business volume is quoted individually.

Does Undetectable AI have a free plan?

No. Undetectable AI gives you a 250-word trial so you can see the output quality once, and after that every use requires a paid plan. There is no recurring free allowance. WriteHuman and BypassGPT both offer small monthly free tiers if a permanently free option is what you are looking for.

What is Undetectable AI Pro?

There is no plan called Pro at Undetectable AI. Its tiers are named by monthly word volume: 10,000, 20,000, 35,000 and 50,000 words, plus a custom Business plan. People searching for Undetectable AI Pro usually mean the paid subscription generally, or they are thinking of a different vendor whose tiers do carry that name.

Is Undetectable AI worth the money?

At $5.00 per month billed yearly it is within a cent of the cheapest entry price among the established humanizers, and for 10,000 words a month that is good value. Humanize AI matched it almost exactly when we read its page on August 30, 2026, at $4.99 a month billed yearly for the same 10,000 words, though its entry tier cannot re-run your text. It stops being the cheapest option per word above roughly 20,000 words a month, where tools that price volume more aggressively land nearer $0.25 per 1,000 words against its $0.45 to $0.48.

Can I cancel Undetectable AI and get a refund?

You can cancel, but the guarantee is narrower than a general refund. Read on their terms page on September 8, 2026, the remedy is a refund of credits, it applies only where a submission provably measures below a stated threshold on a third-party checker, and the request must be made within 30 days of the incident. Cancelling stops future charges but does not refund prior billing periods, and their help center says remaining credits expire on cancellation, so use the allowance you have paid for before you cancel.

Is there a cheaper alternative to Undetectable AI?

Cheaper depends on volume. Nothing beats $5.00 per month at the entry tier. Past about 20,000 words a month, Walter Writes at $0.27 per 1,000 words, WriteHuman at $0.25 and our own Starter at $0.24 (Pro at $0.16) all cost less per word, although our entry price is higher, so the right comparison is your monthly word count against each tier, not the headline price.

Undetectable.ai is a product of Undetectable AI, and we are not affiliated with it. This page is a comparison published by Undetected.ai, a competing AI humanizer. We publish their prices because we read them ourselves, and we tell you where they win.

Go deeper

Compare the output, not just the price

Paste a paragraph of your own writing, watch the gauge move, and check that every number and name survived the rewrite. That comparison costs nothing and settles the question faster than any table.

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