Independent review · prices read on stealthwriter.ai September 5, 2026
StealthWriter AI review: pricing, daily limits, and the one line that decides your tier
StealthWriter has no pricing page, five tiers that live in two places that disagree, and a ladder from $20 to $400 a month in which the dearer tiers publish no extra capability at all. Here is the whole thing, dated, with the number that actually separates the plans.
2 free runs a day, up to 200 words each. We save your run so you can get back to it, and a delete button appears with the result. See privacy.
This is our own AI-pattern score, measured here on sentence rhythm, template phrases, vocabulary variety and passive voice. It is not a GPTZero, Turnitin, Originality.ai, Copyleaks or ZeroGPT result, and it does not predict one. Worth knowing: we also ask the rewrite to vary sentence length, drop template phrases and prefer the active voice, so some of the drop is built in. Read the two panels below, not just the number.
Before ·
After ·
Written by Undetected.ai, a competing humanizer · every price quoted from the vendor's own page
The short answer
StealthWriter is a web-only AI humanizer with a built-in detector, priced at $0, $20, $50, $100 or $400 a month in USD. Every paid tier publishes the same 5,000 words per input, so the only figure that moves as you climb the ladder is humanizations per day: 50 on Starter, 2,000 on Scale. That makes everything above Starter a burst-capacity purchase rather than a better product, and Starter's 50 runs a day already works out at 1,500 a month. The genuine upgrade is Free to Starter, which raises the input cap from 1,000 to 5,000 words and, according to their FAQ rather than their pricing cards, moves you from Ghost 5.2 Mini to Ghost 5.2 Pro. There is no API and no browser extension on any tier.
Last updated September 5, 2026. Read stealthwriter.ai through two independent channels that day, US geo, both agreeing line for line. The site has no pricing page: /pricing and /plans both return 404.
The ladder
StealthWriter pricing, with the ceiling each daily cap works out to
Five tiers, two of which are not on the same page as the other three. Every figure read September 5, 2026.
| Plan | Monthly | Annual | Humanizations | Words per input | Works out at |
|---|---|---|---|---|---|
| Free | $0 | $0 | 10 / day | 1,000 words | 300 runs a month |
| Starter | $20/mo | $200/yr | 50 / day | 5,000 words | 1,500 runs a month |
| Plus | $50/mo | $500/yr | 150 / day | 5,000 words | 4,500 runs a month |
| Pro | $100/mo | $1,000/yr | 350 / day | 5,000 words | 10,500 runs a month |
| Scale | $400/mo | $4,000/yr | 2,000 / day | 5,000 words | 60,000 runs a month |
Two things about this table are worth saying out loud before anything else. The first is that annual billing is a flat two months free on every tier, with no tier-specific incentive: $200 against $240, $500 against $600, $1,000 against $1,200, $4,000 against $4,800. That is unusually clean, and it means the annual decision is the same decision at every price point.
The second is that the Scale tier at $400 a month appears on no pricing card. It exists in one sentence in the FAQ answer to "What plans are available?", which is also the only place the annual figures are printed. The four cards on the homepage carry the monthly prices only. If you are budgeting from what you can see on the page, you will not find half of this table.
The line that decides your tier
Above Starter, more money buys more runs per day and nothing else
Read the four cards side by side and one thing stands out: the only numbers that change between Starter at $20 and Pro at $100 are humanizations per day and AI scans per day. The words per input figure is 5,000 on all of them. No card names a stronger model, a longer document, an extra output mode, a team seat or a feature of any kind that Starter lacks.
So the honest way to describe the paid ladder is as a volume meter. The question is not "which tier is better" but "how many separate rewrites will I run in a single day", and for most individual buyers the answer sits far below the floor. Starter's 50 a day is 1,500 a month. A writer publishing four long posts a week, running each through three or four times while editing, uses perhaps 60 runs a month. That is four percent of what the cheapest paid tier already allows.
The daily reset is the one thing that can catch you out, because it is a per-day cap rather than a monthly allowance and nothing rolls over. If your work arrives in bursts, a migration weekend, a client deliverable, a batch of 200 product descriptions in one sitting, then the daily number is a real constraint and the tier above may genuinely be the right buy. If your work is spread across the month, it never binds.
The upgrade that does change the product
Free to Starter is the only step on this ladder that buys a different experience rather than more of the same one. It raises the input cap from 1,000 to 5,000 words, which is the difference between pasting a section and pasting a whole report. And their FAQ, in the answer about languages rather than anywhere near the pricing, says: "Use Ghost 5.2 Mini on Free, or upgrade to access Ghost 5.2 Pro for stronger humanization." That is the vendor describing its free tier as running a weaker model, and it is disclosed nowhere on the pricing cards themselves.
What is claimed, and what is not
The most unusual thing about StealthWriter is what it refuses to promise
Quoted from their own pages, read September 5, 2026.
We read the StealthWriter homepage and the whole FAQ looking for the sentence this category is built on, the one that names a detector and promises to beat it. It is not there. No Turnitin, no GPTZero, no Originality.ai, no Copyleaks, no percentage, no guarantee, no "100% undetectable". The product is sold on how the output reads: "clean, natural output in under 10 seconds, with sentence-level fine-tuning and multiple rewrite levels".
It goes further than simply omitting the promise. Asked how to use it at work or school, StealthWriter's FAQ answers: "Always follow your employer's or institution's policies on AI-assisted writing. Do not use it to misrepresent authorship or violate workplace or academic rules." That is a vendor talking a buyer out of the use case that sells the most subscriptions in this market.
We think that is the right call and we hold the same position, so it would be dishonest to frame it as a weakness. If you are shopping for a tool that guarantees a specific detector result, no tool can honestly give you that, and StealthWriter is one of the few that does not pretend otherwise. What you can compare is what the vendors actually publish: price, words per run, allowance and what happens to your text.
Rewrite levels 1 to 10
Their FAQ: lower levels "make minimal changes", higher levels "rewrite more heavily". A ten-step dial is finer control than the light, medium and aggressive presets most rivals ship.
Per-sentence alternatives
"Click any sentence to choose from multiple alternatives." This is the feature most worth the money here, because it lets you reject a bad rewrite of one line without re-running the document.
Deep Scan
Sentence-by-sentence analysis with color-coded highlights, plus a V1 and V2 detector. Scans are metered on the same daily counter as rewrites on every tier.
No API, stated plainly
"Not at this time. StealthWriter is a web-only tool, there is no public API." Nothing on the $400 tier changes that, which rules the product out of any automated pipeline.
No browser extension
On the roadmap, not shipped. Every rewrite is a copy and paste round trip, which is also where formatting and internal links get lost in any tool of this kind.
Retention, in their words
StealthWriter states: "Text you submit for humanization or scanning is not stored after processing is complete." That is their published policy, quoted here rather than tested, because retention is not something an outside party can verify.
The paid field
Entry tiers compared, with the date each vendor's page was read
Prices move in this category. Every row below carries the day we last read it first-party.
| Tool | Entry price | Words per run | Allowance | Read |
|---|---|---|---|---|
| StealthWriter | $20/mo ($200/yr) | 5,000 words | 50 runs a day | Sep 5, 2026 |
| Humanize AI | $4.99/mo billed yearly | Whole documents on Standard | 25,000 words a month on Standard | Aug 30, 2026 |
| Undetectable.ai | $5/mo billed yearly | Not published | 10,000 words a month | Jul 31, 2026 |
| Humbot | $6.79/mo billed yearly | 500 words | 3,000 basic + 1,000 advanced words | Aug 25, 2026 |
| QuillBot | $8.33/mo billed yearly | Not published for Premium | No word cap published on Premium | Aug 10, 2026 |
| Surfer | $49/mo billed yearly | 1,000 words signed in | Not published | Sep 3, 2026 |
| Undetected.ai | Planned from $9/mo billed yearly | 1,500 words | 15,000 words a month | Ours |
Read down the words-per-run column and StealthWriter wins it outright. At 5,000 words per input it publishes the largest per-run cap of any tool we have checked first-party, five times our own 1,500 and ten times Humbot's 500 at entry. If your recurring problem is chopping a long report into pieces and stitching the rewrites back together, that column is the whole decision and StealthWriter is the answer to it.
Read down the price column and the picture reverses. At $20 a month its entry tier is the dearest here apart from Surfer, which is not really a humanizer purchase at all, and it is four times the $5 entry at Undetectable.ai. You are paying that premium for room per paste and for the sentence-level editing, not for a bigger monthly allowance, because StealthWriter does not sell monthly words at all.
That difference in unit is worth pausing on, because it makes direct comparison harder than it looks. Most of this category sells you a pool of words a month. StealthWriter sells you a number of button presses a day, each of which may carry up to 5,000 words. Whether that is generous or mean depends entirely on how long your documents are, and there is no exchange rate between the two models that holds for everybody.
Buy it, or do not
Who each tier is actually for
People with long single documents. Buy Starter. The 5,000 word input is the best published per-run figure in the category and it is the reason to choose this product. A 4,500 word white paper goes in as one piece and comes back rewritten against itself rather than as three chunks that never saw each other.
Careful editors. Buy Starter. The per-sentence alternative rewrites and the 1 to 10 level dial are real craft tools, and they matter more than any tier difference above them. Being able to reject one bad line without re-running the document is worth more than 300 extra runs a day you will never use.
Anyone who needs this in a pipeline. Do not buy any tier. There is no API and no extension, and the $400 Scale plan does not add either. Rewriting from your own code, a cron job or a CMS hook is impossible here by design, and that is the one requirement no amount of money solves on this product. If that is you, an AI humanizer with a documented API is the category to shop in instead.
Occasional users with short pieces. Stay on Free, or look cheaper. If your documents are under 1,000 words, the free tier's 10 runs a day is 300 a month and you will not exhaust it. The caveat is the model: their FAQ says free runs Ghost 5.2 Mini rather than Ghost 5.2 Pro, so judge the free output as the weaker version of the product rather than as a sample of what you would be buying.
Anyone weighing Plus, Pro or Scale. Work out your real daily peak first. These tiers publish no capability Starter lacks, so the only honest reason to buy one is that you genuinely run more than 50 rewrites in a single day. Count a busy day before you spend $50, $100 or $400 a month on capacity the cards say is identical in every other respect.
Frequently asked
StealthWriter questions people actually search
Does StealthWriter have an API?
No. StealthWriter answers this directly in its own FAQ: "Not at this time. StealthWriter is a web-only tool, there is no public API. An API may be offered in the future." If you need to humanize text from your own code, a scheduled job or a CMS plugin, StealthWriter cannot do it at any price, including the $400 a month Scale tier.
Does StealthWriter have a Chrome extension?
Not yet. Their FAQ says a browser extension is on the roadmap but not available, and that StealthWriter is a web app you use in the browser. Everything goes through copy and paste into stealthwriter.ai, so it will not rewrite in place inside Google Docs, WordPress or your email client.
What is the StealthWriter daily limit?
The daily limit is the number of humanizations you may run in a day, and it is the main thing each tier sells. Free allows 10 a day, Starter 50, Plus 150, Pro 350 and Scale 2,000. The count resets daily and nothing carries over, so an unused Tuesday does not make Wednesday larger.
How much does StealthWriter cost?
StealthWriter costs $20, $50, $100 or $400 a month, with annual billing at $200, $500, $1,000 and $4,000, which is two months free on every tier. There is a free plan at $0. All figures are in USD and were read on stealthwriter.ai on September 5, 2026, because the site has no pricing page.
Is the StealthWriter free plan good enough?
It depends on your document length, not your volume. Free gives 10 runs a day, which is 300 a month and more than most writers need. The two real constraints are the 1,000 word input cap and the model: their FAQ says free users get Ghost 5.2 Mini, and Ghost 5.2 Pro requires an upgrade.
Is StealthWriter worth it compared to cheaper humanizers?
It is worth it if you paste long documents. At 5,000 words per input StealthWriter publishes the largest per-run cap of any tool we have checked first-party, which matters if splitting a report into chunks is your actual problem. If your documents are short, entry tiers elsewhere start around $5 a month.
Does StealthWriter claim it beats Turnitin or GPTZero?
No, and that is unusual here. We read the StealthWriter homepage and full FAQ on September 5, 2026 and found no named detector, no bypass promise and no guarantee. Their FAQ instead tells users to follow their employer or institution policy on AI-assisted writing and not to misrepresent authorship.
Who is StealthWriter best for?
Writers and marketers who work in long single documents and want sentence-level control. The 5,000 word input, the 1 to 10 rewrite levels and the per-sentence alternative rewrites suit someone editing one big piece carefully. It suits automated or high-frequency workflows poorly, because there is no API.
Keep reading
The rest of the field, priced and dated
Best AI humanizer
The whole paid field on price, allowance and data handling, including where each rival is the better buy.
Humanize AI review
Four tiers, and the entry plan that cannot re-run your text. The cheapest way in is not the cheapest tier.
Humbot review
A 500 word request cap at entry, and word credits shared across thirteen separate tools.
AI humanizer for bloggers
Every paid tier in the category worked out as a cost per published post, from $0.43 to $6.00.
AI humanizer API
The thing StealthWriter does not have, with the request shape and the rate limits written down.
Undetectable AI pricing
The cheapest entry price in the category, tier by tier, and what the annual figure really commits you to.
Before you pick a tier
Paste a real paragraph of your own draft, not a sample, and read the rewrite against the original. Our tool shows our own AI-pattern score for the text before and after, with the reasons behind each number, so you can judge what changed rather than take a status message on trust.