StealthGPT bundles an AI writer and a humanizer in one product, which is unusual in a category where most tools do one or the other. Pricing sits somewhere around $25 to $35 for entry and mid tiers, scaling toward $250, with a free tier limited to roughly one request per tool per week. The genuinely useful thing to know is that almost every StealthGPT review online is published by a competing humanizer, and their results contradict each other completely — one rival's test reports it failing Turnitin at 86% AI, another reports it passing all ten detectors tested.
Reviewed by EdGrows·Updated Aug 18, 2026Affiliate link — we may earn a commission
This analysis is based on documentation, public user reports, and vendor materials — not yet on our own hands-on testing. How we rate
Search for StealthGPT reviews and you'll find detector tests with confident numbers. Here are three from 2026:
Phrasly is a competing humanizer. HumanizeMyAI is a competing humanizer. The third sits inside a content ecosystem promoting its own tooling.
These aren't fringe sources — they're what ranks when you search. And they can't all be right.
To be clear about our own position: AIVario has no affiliate relationship with StealthGPT or any humanizer, which is why this page reports the contradiction rather than picking whichever number suits a commission.
You cannot resolve this from published reviews. The only reliable test is your own text, on the detector you actually care about, at the time you use it — because detector models update, humanizer engines update, and a result from March is not a result from August.
Which makes the free tier's limits a real problem: roughly one request per tool every seven days, per independent reporting. That's enough to see the interface and not enough to evaluate anything.
Reported tiers from different 2026 sources:
| Source describes | Entry | Mid | Higher |
|---|---|---|---|
| One review | ~$25 Essential | ~$35 Pro | to ~$250 |
| Capterra listing | ~$30 Pro | ~$34.50 Essential | $100.50 Business, $499.50 Enterprise |
| Another review | ~$15 basic | $24.99–$49.99 | — |
The "Hacker" tier that older reviews reference no longer exists. One reviewer noted the site blocks bots, which is part of why third-party pages disagree.
Three costs that don't appear on the pricing page:
The Samurai engine costs extra. The premium engine marketed as best for bypassing Turnitin runs around $5 more per month unless you're on Pro or above.
"Unlimited words" has daily caps. The Essential plan is reportedly capped at 50 uses per day.
Unused credits expire monthly. No rollover.
Unusually for this category, StealthGPT bundles two products: an AI content generator (essays, blog posts, assignments) and a humanizer that rewrites existing AI text. Most competitors do one.
Around that sit a built-in detector, an SEO writer, study tools and a Chrome extension. The all-in-one framing is the genuine differentiator — one login, one subscription, generation and rewriting in a single workflow.
Reviewers rate output as usable on short and medium prose, with the standard caution for long documents: chunk anything over about 2,000 words and check each section for meaning drift. Rewriting can quietly change what a sentence claims, which matters most in technical and academic writing — exactly where people reach for these tools.
There are legitimate uses for humanizers. AI output has recognisable tics — flat sentence rhythm, stock transitions, an evenness that reads as machine-made — and rewriting to remove them genuinely improves readability. Non-native speakers use them to smooth prose. Marketers use them so copy doesn't sound like every other page.
Submitting rewritten AI work as your own coursework is not one of those uses. That's an integrity violation on its own terms, independent of whether any detector catches it — the policy question and the detection question are separate, and only one of them is about software.
Worth knowing on the detection side anyway: Turnitin rolled out AI-bypasser detection in August 2025, specifically targeting text that was AI-generated then run through a humanizer, plus separate paraphrasing detection. Both are English-only for now. The arms race has another round in it.
For publishers, a different caution: there's no evidence detector scores affect Google rankings at all. What Google does act on is scaled content with no real value — and rewriting thin AI content doesn't make it substantive, it just makes it harder to classify. The rewriting doesn't fix the underlying problem.
Coursework. Covered above.
Long technical documents unsupervised. Meaning drift is real; chunk and review.
Anyone who needs to evaluate before buying. One request per week isn't an evaluation.
Budget predictability. Tiers, add-on engines, daily caps and expiring credits, with sources disagreeing on all of it.
Against Undetectable AI: Undetectable AI is the largest tool in this category with a more established track record and clearer pricing. StealthGPT's differentiator is bundling generation with humanizing; if you only need rewriting, the specialist is the simpler purchase.
Against Phrasly: Phrasly is cheaper at around $11–13 a month annually with a bundled detector and writing toolkit. Its own published testing shows mixed detector results — passing GPTZero comfortably, averaging around a coin flip against Turnitin. Note that Phrasly and StealthGPT publish tests of each other, and neither should be your only source.
Against Humanize AI Pro: Humanize AI Pro markets aggressively on free access. Same caution applies to its self-published comparisons.
Against QuillBot: QuillBot is a general paraphrasing tool that doesn't reliably beat detectors and isn't trying to — it's the honest option if you want smoother prose without the evasion framing.
Against writing it yourself: worth stating. If AI output reads mechanically, editing it by hand fixes the readability problem permanently, costs nothing, and doesn't depend on which side of an arms race is currently winning.
| Tier (reported) | Roughly | Notes |
|---|---|---|
| Free | $0 | ~1 request per tool per 7 days |
| Essential | ~$25–34 | Daily use caps apply |
| Pro | ~$30–35 | Includes Samurai engine |
| Business | ~$100 | Higher volume, seats |
| Enterprise | ~$500 | Custom |
| Samurai engine | +~$5/mo | Free on Pro and above |
Checked August 2026 — and flagged as uncertain. Sources disagree substantially on StealthGPT's tiers, with entry reported anywhere from $15 to $34 and the overall range described as $25 to $250. The "Hacker" tier referenced in older reviews no longer exists, and the site reportedly blocks bots, which is part of why third-party pages conflict. Unused credits expire monthly. Verify everything at stealthgpt.ai before paying.
Verify pricing yourself. No third-party page in this category is currently reliable, including this one.
Test on your own text, on the detector you care about. Published results contradict each other because most are published by competitors.
Budget the Samurai add-on and the daily caps. Neither is visible from the plan names.
Chunk long documents and read the output. Meaning drift is the failure mode nobody markets.
StealthGPT is a competent all-in-one in a category where honest information is genuinely hard to find. Bundling AI generation with humanizing in one subscription is a real convenience, output is usable on short and medium prose, and the API and Chrome extension make it workable inside a real process.
Almost everything else about evaluating it is obstructed. Pricing sources contradict each other — entry reported anywhere from $15 to $34, the overall range described as $25 to $250, and a tier older reviews still cite that no longer exists. The free tier allows roughly one request per tool per week, which prevents the only evaluation that would settle anything. And the detector tests you'll find are published overwhelmingly by competitors, reaching opposite conclusions: one rival reports it failing Turnitin at 86% AI, another reports it passing all ten detectors tested.
We have no stake in either result, which is why this page reports the conflict rather than resolving it in someone's favour. The practical implication is that you can only find out by testing your own text — and the free tier is built to make that difficult.
On use: humanizers have legitimate applications in commercial writing and non-native-speaker editing. Coursework isn't one of them, and that holds regardless of detection, which Turnitin has been targeting specifically since August 2025.
For writers who want generation and rewriting bundled and will verify claims themselves, it's a reasonable option at a price you'll have to confirm. For anyone hoping published reviews will tell them whether it works, this is not a category where that's currently possible.
Note: StealthGPT does not have an affiliate program with AIVario. We earn no commission from this page, and unlike most reviews of this tool, we do not compete with it either.
Best for: Writers wanting generation and humanizing in one subscription, marketing copy that reads too mechanically, users who'll run their own tests Not ideal for: Academic submissions, long technical documents without review, buyers needing pricing clarity, anyone relying on published bypass claims Bottom line: A capable bundled tool wrapped in the least trustworthy review ecosystem in software — verify the price yourself, test on your own text, and don't use it for coursework.
Sources disagree, which is itself the finding. Reported tiers include Essential around $25, Pro near $30–35, Business around $100 and Enterprise near $500, while other sources list entry as low as $15 and the overall range as $25 to $250. The 'Hacker' tier that older reviews reference no longer exists. Verify directly at stealthgpt.ai, since the site blocks bots and third-party pages have been quoting superseded structures for a while.
Barely. Independent reporting describes the free tier as roughly one request per tool every seven days — enough to look at the interface, nowhere near enough to test whether it works on your own writing across a few drafts. Given that output quality and detector performance both vary enormously by text type, a single request tells you almost nothing. That's a meaningful obstacle to evaluating this product honestly.
The published evidence is a mess, and the reason is who's publishing it. A test run by Phrasly reported StealthGPT failing badly — 86% AI on Turnitin, 100% on Originality.ai. A test published on a hosting company's blog reported it passing all ten detectors including those two. A third, by HumanizeMyAI, put it at 24.5% mean AI-flagged across six checkers while their own tool scored 6.2%. Each of those publishers competes with StealthGPT.
Three worth knowing. The premium Samurai engine — the one marketed as best for bypassing Turnitin — costs around $5 extra per month unless you're on Pro or above. Daily use caps apply even on plans advertised as unlimited words, with the Essential tier reportedly capped at 50 uses a day. And unused credits expire monthly rather than rolling over. None of these are obvious from the pricing page.
For coursework, yes — and that's true regardless of whether any detector catches it. Running AI-generated work through a rewriter to pass an institutional integrity check is a violation of that policy on its own terms; the detection question is separate from the honesty question. There are legitimate uses for these tools, mostly in marketing and non-native-speaker editing, but submitting rewritten AI work as your own isn't one of them.
Editing AI-assisted drafts so they read less mechanically, mostly in commercial writing. AI output has recognisable tics — flat sentence rhythm, stock transitions, a certain evenness — and rewriting to remove those genuinely improves readability. Non-native speakers also use these tools to smooth prose. The distinction that matters is whether you're improving writing you're entitled to submit, or disguising authorship you're required to disclose.
Not well without supervision. Reviewers consistently advise chunking anything over roughly 2,000 words and reviewing each section for meaning drift — the rewriting process can subtly change what sentences claim, which matters most in exactly the technical and academic contexts where people reach for these tools. Any humanized long-form output needs reading end to end before it goes anywhere.
There's no evidence detector scores affect ranking at all. Google evaluates content quality regardless of production method, and no detector output feeds into its systems. What Google does penalise is content produced at scale with no real value — and running thin AI content through a rewriter doesn't make it substantive, it just makes it harder to classify. The rewriting doesn't fix the underlying problem.
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