AI Humanizer Pricing Comparison: Limits, Billing and Costs

A price list is only half of a pricing comparison, because AI humanizers meter usage in different units: words, requests, daily runs, file sizes or separate credit pools. This guide uses the official pricing pages of seven tools, checked on October 11, 2026. It shows what each page states, works through the arithmetic for monthly versus annual billing where both prices were read, explains how to calculate a cost per 1,000 words with an invented example, and says plainly what could not be verified. It was prepared from the text of each page, not from a full visual review of each page, and it does not name a cheapest or best-value tool, because the plans are not measured in comparable units.

Why the monthly price is only part of the cost

Two plans at similar prices can allow very different amounts of work. A plan with a generous monthly total but a 600-word cap per run forces you to split a long essay into several runs. A plan with a daily humanization count suits steady daily use but not an occasional large batch. The sticker price tells you none of this, so this guide compares limits first and prices second.

For how we judge tools beyond price, see how we test AI humanizers and the AIHT Rating page. Price is one input to a decision, not a quality signal.

The limit types you will meet

Vendors also name credits differently. We found no official statement that one vendor’s credit or word equals another’s, so this guide does not convert between them.

Monthly versus annual billing: a worked example

Two of the seven pages showed a monthly and an annual price for the same plan in a way we could read: WriteHuman and StealthWriter. The formulas are: annual saving = (12 times the monthly price) minus the yearly total; saving percentage = annual saving divided by (12 times the monthly price), multiplied by 100. The same checks do not apply to the other pages, either because they showed no annual price or because the billing period was unclear (see the unknowns below).

The page itself states savings of $96, $120 and $240 per year, which match this arithmetic. WriteHuman’s captured text did not name the currency, so we show the amounts as displayed.

StealthWriter’s yearly tab is labeled “Save 17%”, which rounds the 16.7 percent we calculate. Check the yearly charge and payment schedule at checkout, and we did not read the refund terms for annual billing on either page, so check them before choosing it.

GPTinf showed a Yearly toggle labeled “Save 50%”, but we could not turn that into a yearly total or a billing cadence; the details are in the unknowns below, and we do not calculate an annual saving for it.

Plan limits we could read on the official pages

The tables use only text read on each vendor’s own pricing page, linked in the first column. A price appears only where the page made the billing period clear. Limits are listed in the unit and period the page used.

StealthWriter also lists an Enterprise plan with custom pricing. Its daily humanization count is a daily limit, not a monthly word total, so it cannot be converted into a monthly volume without assumptions about your usage.

GPTinf lists three plans with word allowances, a built-in paraphraser allowance and a file-to-file humanizer. The table below shows what the page displayed in each billing view, because the billing terms were not clear. File sizes are file-upload caps; the captured text did not give a separate limit for pasted text.

Both views label the price “/monthly”, the page shows no yearly total in either view, and the page does not state the period for the word allowances beyond that label. Its FAQ says all plans are month-to-month. We could not reconcile these statements, so we do not say how or when the lower figures are billed.

What we could not verify

These items are left out of the tables above. They are gaps in our reading, not claims that a tool is cheap or expensive.

• GPTHumanizer and HIX Bypass prices: each page showed two sets of figures per plan, and the text did not label which belonged to monthly billing, yearly billing or a promotion.
• Humbot: the plan cards were not labeled with tier names and showed dashes where prices should be, so we do not list Humbot plans or prices. Its page mentions separate Basic and Advanced word counts.
• BypassGPT paid plans: only the free plan rendered, even after a longer wait for scripts.
• GPTinf billing: the Yearly view, the “/monthly” label and the month-to-month FAQ statement conflict as described above.
• Humanize AI: not audited. The humanize-ai.com pages we reached did not show plans (the pricing path returned a not-found page and the home page is a blog), so we make no pricing claim about it. Our Humanize AI review covers it separately.
• Refund and cancellation terms: several answers were collapsed or absent in our reading; see the renewal table.

How to calculate a cost per 1,000 words

A cost per 1,000 words is meaningful only when a plan states a word allowance, a price and a billing period you can match to each other. The formula is: price for the period divided by the words allowed in that period, multiplied by 1,000. We do not apply it to any plan on this page, because none of the readable plans states all three clearly enough, and it cannot be applied to request or daily-count plans without assumptions about your usage.

Here is an illustrative plan, not a quoted vendor offer: it costs 10.00 US dollars per month and includes 20,000 words per month.

The example assumes the full price buys only the humanizer words, which is not true of plans that bundle a paraphraser, detector or other tools. When a price covers several allowances, splitting it between them is a choice you make, and it should be stated. Use the same currency and the same period throughout, and do not mix per-word and per-1,000-word figures.

How workload changes the answer

The scenario below uses invented numbers to show how limits interact. It is an illustration of the method, not a recommendation or a usage estimate.

Illustrative scenario: a writer humanizes three 900-word drafts per week for four weeks. That is 3 times 900 times 4 = 10,800 words per month, in 12 drafts of 900 words each.

GPTinf is left out of this check because its page does not clearly state the period for its word allowances. The table is a limit check only. A plan that fits your volume still has to produce text you can use, so test output on your own writing before paying, following the checks in our features checklist.

Free access and trials: what each page states

Free access is useful for judging output on a short passage. It is not a stand-in for the paid plan you would actually use.

• WriteHuman: a free plan with 3 requests per month and a 250-word cap per request, with basic humanization quality.
• StealthWriter: a free plan with 10 humanizations per day and 1,000 words per input, with restricted model access.
• BypassGPT: a free plan with 150 words per month and 80 words per input.
• GPTinf: the page says you can humanize text without signing up and see the beginning of the result, with a plan needed to unlock the full output. That is a preview, not an ongoing free plan.
• Humbot: its FAQ refers to a Free plan for testing; we could not read the free-plan limits.

A very small free allowance can hide how a tool handles a full-length document. If your real drafts are 1,500 words, a 250-word free test tells you little about how that tool handles your draft.

Renewal, cancellation and refunds as documented

A guarantee is the vendor’s promise on the vendor’s terms. Whether trying a plan within a stated window leaves you eligible depends on the full terms, and GPTHumanizer’s page, for example, ties its refund to low usage. Read the complete policy before you rely on any window, and do not assume that using a plan during it keeps you eligible.

A short pricing worksheet

1. Write down your typical document length and how many you process per month.
2. Remove plans whose per-request cap is below your document length unless splitting is acceptable. Treat file-upload caps separately from pasted-text caps.
3. Check the unit and the period: words, requests, daily runs, file size, credit pools or lifetime, and compute your own need in that unit.
4. Compare monthly and annual billing using the formulas above, and confirm when the yearly amount is charged.
5. Read refund and cancellation terms on the vendor page and record the date you read them.
6. Test output on your own writing for meaning accuracy before spending.

Before you pay

• I know the unit and period each plan uses and my need in that unit.
• My longest document fits the per-request cap, or I accept splitting it.
• I did not confuse a file-upload limit with a text limit.
• I compared annual and monthly totals, not only the monthly equivalent.
• I read the full refund and cancellation terms and noted the date.
• I tested output on my own text, not only on the free sample.

For editorial ratings, see the best AI humanizer ranking, the reviews of WriteHuman, StealthWriter, GPTinf, GPTHumanizer, HIX Bypass, Humbot and BypassGPT, and the free AI humanizer guide if you are still deciding whether to pay.