The cheapest AI humanizer by headline price is almost never the cheapest to use, and this page is the arithmetic rather than a number. Allowances in this category are quoted in different units, reset on different schedules, and measure different things, so two plans at the same monthly price can differ several times over in what they actually let you rewrite.
We are not printing a price table here, deliberately. Prices and allowances in this category change often, and our own pricing lives on one page that is kept current rather than copied across the site where it goes stale. What follows is how to compare, which does not go out of date.
Four questions. Ask them of every vendor including us, and the ranking usually changes.
1. Is the allowance words or characters? These aren't interchangeable and the category mixes them freely. Roughly six characters to a word in English, so a 60,000-character plan is about 10,000 words. A vendor quoting characters next to a competitor quoting words isn't comparing like with like, and sometimes that's the point.
2. Does the counter measure words in or words out? Ours counts words sent into the humanizer. If a vendor counts output instead, a rewrite that expands your text costs you more than the same plan appears to allow.
3. Is there a per-request cap underneath the monthly one? This is the cost nobody advertises. A generous monthly allowance with a small per-request ceiling means long documents must be split, and over the ceiling the request is declined rather than chunked for you. Two plans with identical monthly numbers can be very different to live with.
4. Does the allowance reset monthly, roll over, or expire as credits? Per-word credit pricing dressed up as a subscription is common here. Credits that expire monthly are a use-it-or-lose-it plan with a subscription label.
Monthly cost divided by the words you'll genuinely rewrite in a month, not the ceiling. Most people overestimate the second number substantially, which is how they end up on a tier they don't use. If you are editing two or three short pieces a week, a free tier may already cover it.
A rewrite you've to check costs you time, and a rewrite you cannot check costs you risk. Those are real costs and neither shows up in a per-word figure.
If a tool hands back prose with no view of what changed, you've two options: re-read the whole passage against the original, which nobody does, or accept it unseen. On a blog post that is fine. On anything with a citation, a figure or a commitment in it, the cheap tool is the expensive one the first time a claim moves and you don't notice.
So the honest version of this comparison has a column most price pages omit: can you see what it did. We show a word-level diff and score before and after with our own detector, labelled as ours. That is also the reason we don't compete on being the cheapest, and we would rather say that than pretend we win on every axis.
The tool-by-tool picture, including which competitor genuinely has the lowest entry price, is on the main best-of page.
Ours gives 3 rewrites a day at up to 260 words each with no account and no card, and 260 words per rewrite on a free account in Light and Balanced modes. Maximum is a paid mode.
Because the workflow worth using is a paragraph at a time, the free allowance covers more real use than the raw number suggests. Scoring your text is separate and costs nothing extra, and for many people the score is the half they actually wanted.
Work out your real monthly volume on the free tier first, then pick a plan against that number instead of against a ceiling you'll never reach. Current plans are on the pricing page.
By headline entry price, StealthGPT is the lowest in this category, and we would rather tell you that than pretend otherwise. Whether it is cheapest to use depends on the unit its allowance is quoted in, whether the counter measures input or output, and whether a per-request cap sits under the monthly one. Work out cost per word you will actually rewrite rather than cost per month, and the ranking often changes.
Ours runs 3 rewrites a day at up to 260 words each with no account and no card, and a free account gives 3 actions a day, scan or rewrite in any mix, at up to 260 words per rewrite in Light and Balanced modes. QuillBot also has a usable free tier, though it paraphrases rather than targeting AI signal. Across the rest of the category free often means a short preview and a paywall, so test on your own text before assuming.
Because prices and allowances in this category change often, and a stale number on a comparison page is worse than no number. We also already publish our own pricing on one page that is kept current, and copying it across the site is how sites end up contradicting themselves. The method on this page does not go out of date, which is why it is the method rather than a table.
Roughly six characters to a word in English, so a 60,000-character plan is about 10,000 words. The category quotes both, sometimes in the same comparison, which makes plans look closer or further apart than they are. Always convert to the same unit before comparing, and check whether the counter measures what you send in or what comes back out.
It is a ceiling on a single rewrite, sitting underneath the monthly allowance, and it is the limit you feel most. A plan with a generous monthly number and a small per-request cap means long documents have to be split by you, and over the cap the request is declined rather than processed in pieces. Ask every vendor for both numbers, because only one of them is usually advertised.
Not necessarily on rewrite quality, but the cheap tiers in this category tend to drop the thing that protects you: a view of what changed. If you cannot see the diff, you either re-read everything against the original or accept the rewrite unseen. For marketing copy that is an acceptable trade. For anything carrying a citation, a figure or a commitment, it is how a cheap tool becomes an expensive mistake.
Any current discounts, including annual billing, are listed on the pricing page rather than here, so that there is one place to keep accurate. What is worth knowing first is that the free path needs no card at all, so you can establish your real monthly volume before paying for anything, and for light users the free tier is often enough.
The tool-by-tool ranking, including who is genuinely cheapest.
See the ranking →What unlimited means in this category, in four different senses.
Read the limits →What the free allowance actually covers.
See the free tier →Why the per-request cap is the limit you feel.
Read the post →The risk a cheap tool without a diff leaves you carrying.
Read the method →The full tool, scored before and after.
See the tool →3 rewrites a day at 260 words, no account, no card. Use it for a fortnight, see what you actually consume, then pick a plan against that number.