StealthGPT review

StealthGPT rewrites AI-generated text and scores it with its own detector. The pricing page lists the AI humanizer and AI detector on every plan, along with history, in-text citations and a feature called Stealth Insights. The footer lists further writing tools, including a summarizer, simplifier, sentence rewriter and grammar checker, plus a "Stealth Writer" feature.

StealthGPT is a different product from StealthWriter, which is run by AiVantage LLC. The StealthWriter review explains the naming overlap.

My take: the bundle is broad, but the humanizer and the apps are the reasons people pay. Judge it on those.

You paste text, choose a mode and run it. StealthGPT's site describes a light mode, Stealth Lite, that removes common AI markers such as long dashes and stock phrases while keeping text close to the original, and a heavier rewrite for bigger changes. Light edits are the better starting point for most real work, because a full rewrite changes more of what you meant.

Legitimate uses:

• Marketing, blog and SEO drafts that read stiffly after an AI pass.
• Emails and reports for non-native English writers who want smoother phrasing.
• AI-assisted drafts you are allowed to use, rewritten so they read in your voice.

Light mode or heavy rewrite?

Example (I wrote this to show what a light pass should do; it is not StealthGPT output):

• Before: "Moreover, it is worth noting that the quarterly results demonstrate a significant improvement across all key metrics."
• After: "Every key number improved this quarter."

That is the whole job of a light pass: cut the stock connectors and padding, keep the fact. If a tool's light mode doesn't get you close to that, the heavy mode won't save it.

StealthGPT's pricing page pitches the humanizer for "papers, reports, and creative work". Schools set their own AI rules, and rewriting does not change what a rule allows. Read your policy first; the guide on whether using an AI humanizer is cheating covers where the line sits, and the guide to AI detector false positives covers what a detector flag means. For Turnitin specifically, see can Turnitin detect humanized text.

Only as a trial. StealthGPT's AI humanizer page says it offers a free trial that lets you test the humanizer before you pay, and the pricing page has no free plan. The site also runs a free AI detector page. If you want an ongoing free allowance, the best free AI humanizers list covers tools that have one.

Paid plans listed on 29 October 2026, in US dollars, billed monthly:

• Yearly billing saves up to 17.5%, according to the pricing page.
• "Unlimited words" in StealthGPT's FAQ refers to your monthly total; each request is still capped by the per-request limit.
• Samurai is an add-on that adds 10,000 words; check its price in your account before buying.
• File uploads: Pro takes .doc and .txt; Max and Enterprise add .pdf and image files.
• Payments run through Stripe, and the FAQ says you can cancel from your account page at any time.

Compared with the field, Pro is a high entry point for 50,000 words. Walter Writes AI's Starter plan was $8 a month billed annually for 30,000 words, and Undetectable AI started at $5 a month billed annually for 10,000 words, both read the same day.

What the plans cost per 10,000 words

The last column of the plan table above does the arithmetic, and it is simple: Max costs less than half as much per word as Pro, and it doubles the per-request cap. If you regularly hit Pro's 50,000-word ceiling, Max is the step up I'd take; if you use far less than 50,000 words, you are paying for words you never use, and a cheaper rival makes more sense.

My take: Pro only makes sense if you specifically want the iOS app or MCP. For pure humanizing on a budget, the rivals in the comparison below cost a fraction of the price.

Every plan includes an AI detector. Like any detector, it estimates probability, and a seller's own detector is not a neutral second opinion. For outside tools, see the GPTZero review, the Originality.ai review and the explainer on how AI detectors work.

Detector scores move with vocabulary. In the 2023 Patterns study by Liang and colleagues, seven popular detectors flagged more than half of 91 essays by non-native English writers as AI generated, an average false-positive rate of 61.3%.

My take: use the built-in detector as a quick hint while editing, and use someone else's detector if a second opinion matters.

StealthGPT is a live product with a named company, published plans, a support center with billing guides, a public status page and an App Store listing. Those are the basics a buyer should check.

Its main marketing claim is a different matter. The pricing FAQ says StealthGPT "consistently scores as human on Turnitin, GPTZero, Originality.ai, and other major detectors". That is the vendor's claim. Independent research shows why it is not a stable fact:

• Paraphrasing beats detectors until detectors adapt. Krishna and colleagues showed in 2023 that a paraphrase model cut DetectGPT's accuracy from 70.3% to 4.6% at a 1% false-positive rate, and that a retrieval-based defense then caught most paraphrased text.
• Detectors now train on humanized text. Turnitin announced AI bypasser detection on 27 August 2025.
• Humanizers have been studied as a class. Masrour and colleagues (2025) examined 19 humanizer and paraphrasing tools and showed a detector trained on humanized text could catch much of it. The authors work for Pangram, a detector vendor.

The guide on humanizing vs paraphrasing explains why rewriting to beat a detector is a poor bet, and do AI humanizers work gives my wider verdict on the category.

My take: a legit company, a marketing claim I wouldn't rely on.

Figures read on each vendor's pricing page on 29 October 2026, in US dollars.

• StealthGPT if you want a phone app and MCP access.
• Undetectable AI if price matters most. See the Undetectable AI review.
• StealthWriter if you want a real free plan and daily limits.

For a ranked view of the category, see the best AI humanizers, compared. The Walter Writes AI review covers a rival with a detector, 80+ languages and MCP from its cheapest plan; you can also go straight to Walter Writes. Other close rivals: the WriteHuman AI humanizer review, which also offers MCP, and the TwainGPT review for a cheaper multilingual option. Browse more on the HumanRank reviews hub.

• Mobile-first users who want the iOS app.
• People who work in Claude or Cursor, through MCP.
• Small teams that can use the 3 seats on Max.

It is a weaker fit for light users, since there is no free plan and even Pro costs more than rivals' entry tiers, and for anyone who wants to check output with a detector the seller does not run.

Bottom line: pay for StealthGPT for its apps and MCP, not for its detector promises. Everyone else has cheaper options.