> StealthGPT generates, SupWriter rewrites. We compare bypass rates, citation preservation, languages, and pricing so you pick the right one. - **Published**: 2026-07-30 - **Category**: Tool Reviews - **URL**: https://supwriter.com/blog/supwriter-vs-stealthgpt --- # SupWriter vs StealthGPT: Which One Actually Fits Your Work? (2026) StealthGPT and SupWriter get compared constantly, and the comparison usually misses the point. These aren't two versions of the same product. One is built to write for you. The other is built to rewrite what you already wrote. That difference decides which one you should be paying for. Full disclosure up front: we build SupWriter. You should weight everything below accordingly. What we can promise is that we won't publish a StealthGPT number we can't source, and we won't pretend it's a bad tool. It isn't. It's one of the most recognizable names in this category for a reason. Here's the honest breakdown. ## Quick Comparison | | StealthGPT | SupWriter | |---|---|---| | Core job | Generates undetectable content, plus humanization | Rewrites your existing text | | Turnitin bypass | Independent 2026 tests disagree sharply | 99.2% (our 500-sample test) | | GPTZero bypass | Reported AI-probability results range widely | 99.5% | | Originality.ai bypass | Reported as its weakest detector | 99.1% | | Meaning preservation | Reviewers report grammar and quality slips | 9.2 / 10 | | Citation preservation | Not measured in our testing | 94% fully intact | | Languages | Claims 250+ | 100+ with language-specific processing | | Free tier | Free AI detector; no real free humanization | 300 words, no account needed | | Entry price | Roughly $15 to $30 per month, sources disagree | $9.99 per month | Two things in that StealthGPT column deserve a warning label. The bypass rows carry no single number for StealthGPT because the independent tests disagree too badly to average honestly — we get into exactly how badly further down. The price row is a range for a similar reason: the sources conflict about what StealthGPT's cheapest paid plan actually costs. Both are covered below. First, the difference that decides most of this. ## The Biggest Difference: Generator vs Rewriter StealthGPT's product line is wide. There's an AI Humanizer, but there's also Stealth Writer for generating essays, a Stealth Agent that chains research plus drafting plus humanization, an SEO writer, a study simulator, a PDF chat tool, and a Chrome extension. The pitch is that you can start from a prompt and finish with a submission-ready document without ever opening a blank page. SupWriter does one thing. You bring text, we rewrite it so it reads like a person wrote it and stops tripping detectors. There's no essay generator. There's an [AI humanizer](/ai-humanizer), an [AI detector](/ai-detector) so you can verify before you submit, a paraphraser, and a grammar checker. That's the whole surface area, and nothing in it will write the paper for you. Which model is better depends entirely on what you're holding when you sit down. If you have nothing — no draft, no notes, just a due date — StealthGPT's generation stack does something SupWriter flatly cannot. That's a real advantage and we're not going to argue around it. If you already have a draft you care about — a dissertation chapter, a client deliverable, a paper with 30 citations in it — then generation is the wrong tool. You don't want new content. You want *your* content, preserved, made to read naturally. That's the case SupWriter is built for, and it's why our whole engine is tuned around meaning preservation rather than fluency-from-scratch. A generation-first tool has a structural incentive problem here. If the model can rewrite freely, it will, because freer rewriting scores better on detection. The cost lands on your meaning, and you often don't notice until a reader does. ## Detector Performance: Read This Section Carefully Our published numbers come from a 500-sample test where a text only counted as a pass if **all five** detectors cleared it — Turnitin, GPTZero, Originality.ai, Copyleaks, and ZeroGPT. One flag anywhere counted as a failure. We wrote up the methodology in full in our [Humbot vs SupWriter comparison](/blog/humbot-vs-supwriter-comparison-2026), and it's the same methodology behind every SupWriter figure on this page. | Detector | SupWriter bypass rate | |---|---| | Turnitin | 99.2% | | GPTZero | 99.5% | | Originality.ai | 99.1% | | Copyleaks | 99.4% | | ZeroGPT | 99.6% | Now StealthGPT, and here's where we're going to be less satisfying than you want. Independent 2026 reviews of StealthGPT disagree with each other dramatically. One test reported Turnitin not flagging the output at all, with GPTZero at 15% AI probability. Another reported Turnitin flagging the same kind of content at 86% AI. A third landed in the middle, with Turnitin around 22% and GPTZero around 18%. Across the reviews we could find, reported bypass rates ranged from roughly 38% to roughly 79% depending on the detector and the content type. We're not going to average those into a single tidy percentage and present it as fact. That spread is too wide to be a measurement error, and it tells you something more useful than a number would: StealthGPT's results appear to be highly variable depending on which mode you use, what you feed it, and which detector you check against. Several reviewers noted the tool has an aggressive "extreme stealth" setting that changes results substantially. One pattern was consistent across sources, though. **Originality.ai is StealthGPT's weak detector.** Multiple independent tests put it as the checker that most reliably still flags StealthGPT output — one review reported it only getting the score down to 35%, another reported a straight 100% AI verdict. If Originality.ai is what your publisher or client runs, that's the number that matters to you, and we'd test it hard before committing. Our own guide on [how to bypass Originality.ai](/blog/how-to-bypass-originality-ai) covers why that detector behaves differently from the rest. To be fair to StealthGPT: no tool is 100% undetectable, including ours. Our 99%+ figure came with a handful of failures across the 500 samples, concentrated in very short texts where there wasn't enough material to work with. Anyone selling you certainty is selling you something. ## Before and After: What Rewriting Looks Like Here's a paragraph straight out of an AI model, the kind of thing detectors eat for breakfast: > Furthermore, it is important to note that remote work has fundamentally transformed the modern workplace. Studies have consistently demonstrated that employees who work remotely report higher levels of job satisfaction. Additionally, organizations have realized significant cost savings through reduced office space requirements. In conclusion, remote work represents a paradigm shift in how we approach professional environments. Four sentences, four textbook AI tells: the "furthermore" opener, the uniform sentence length, the vague "studies have consistently demonstrated" with no study attached, and the "in conclusion" landing pad on a paragraph that isn't a conclusion. Here's the same paragraph after SupWriter: > Remote work has genuinely changed how offices operate. Survey after survey finds that people working from home report being happier with their jobs — not marginally, but by a consistent margin. Companies noticed a second benefit they weren't necessarily looking for: they were paying for square footage nobody was sitting in. That combination is why the shift stuck. The meaning is untouched. What changed is the shape — sentence lengths now vary from six words to twenty-four, the connective tissue is doing actual work instead of signposting, and the vague claim reads like a person summarizing rather than a model hedging. That variation is exactly what detectors measure, and it's the thing paraphrasers can't fake with synonym swapping. Notice what did *not* happen: no new claims got invented, no statistic appeared out of nowhere, no argument flipped direction. That's the constraint a rewriter operates under and a generator doesn't. ## Academic Work: Citations Are the Dividing Line If you're a student or researcher, this is the section that should decide it. We tested seven humanization tools against academic papers and measured one thing above all else: did the citations survive? Author names, publication years, page numbers, DOIs, formatting conventions across APA, MLA, Chicago, IEEE, and Vancouver. Any alteration counted as a failure, because a paper with mangled references is its own integrity problem regardless of what the detector said. **SupWriter preserved 94% of citations fully intact,** with 2% major breakage limited to nested footnote structures. Most competing tools had major breakage rates above 14% — meaning three or more broken references in a typical 25-citation paper. The full breakdown is in our writeup on the [best AI humanizer for academic papers](/blog/best-ai-humanizer-for-academic-papers). StealthGPT wasn't in that test, so we can't give you a citation number for it. What we can tell you is that its Stealth Writer product advertises generating essays *with* citations — which is a different and, frankly, riskier proposition. Generated citations need verifying against real sources, because language models hallucinate references confidently. A rewriter that preserves your existing, verified citations sidesteps that failure mode entirely. If you're writing something with a bibliography, that distinction is not a nice-to-have. ## Languages StealthGPT advertises support for 250+ languages. SupWriter's [language support](/languages) covers 100+. On the raw count, StealthGPT wins, and we'll say so plainly. The count isn't the useful metric, though. Most tools that list a hundred-plus languages are running a translate-process-retranslate pipeline: your German goes to English, gets humanized in English, and comes back as German with the case endings quietly wrong. We tested six tools across five languages and watched exactly this happen — compound nouns incorrectly split, word order that no native speaker would produce. SupWriter held 94% bypass in Spanish, 86% in Arabic, and a 4.5 out of 5 grammar score in German, which is where most tools collapse. The gap over the next-best tool ran from 22 points in Spanish to 45 points in Arabic; measured against the weakest tools in the test, it was as wide as 68. The full test is in our post on [AI humanizers for non-English content](/blog/ai-humanizer-for-non-english-content). We haven't tested StealthGPT's non-English output ourselves, so treat this as an unverified column. But if you write in a language other than English, the advice holds either way: ignore the number on the features page, run a paragraph through, and have a native speaker read it. The output tells you what the marketing won't. ## Pricing and Free Tiers SupWriter starts at $9.99 per month for 30,000 words, with a 20% discount on annual billing. There's a free tier at 300 words that doesn't require an account, so you can evaluate it in under a minute. StealthGPT's pricing is harder to pin down, and we mean that literally. It uses a tiered "staircase" model, and the figures reported across sources genuinely conflict — some third-party listings put the entry tier around $15 to $20 per month, others put the cheapest paid plan nearer $30, with higher tiers running from roughly $50 to several hundred. Promotional pricing appears to move it around further. Whatever the current number, every figure we could find for the entry point sits above SupWriter's, and the free offering is the AI detector rather than free humanization. That last part matters more than the monthly delta. A free humanization tier isn't generosity, it's a testable claim. When a tool lets you paste real text and check the output against a real detector before paying, you can verify the marketing yourself. Our [free humanizer](/free-humanizer) exists for exactly that reason, and we'd give the same advice about any competitor that offers one. ## What StealthGPT Genuinely Does Better Three things, and they're not small. **Generation.** If you need content that doesn't exist yet, StealthGPT produces it and humanizes it in one pass. SupWriter has no answer to that workflow. You'd need to generate elsewhere and bring the draft to us. **Breadth.** The SEO writer, the study simulator, the PDF chat, the Chrome extension — that's a toolkit, not a single feature. For someone who wants one subscription covering several jobs, that consolidation has real value. **Brand recognition.** StealthGPT has been in this category long enough to have an actual reputation, a support operation, and a large user base. That's worth something when you're choosing a tool you'll rely on under deadline pressure. ## Who Should Choose Which **Choose StealthGPT if** you're starting from nothing and want the draft generated for you, you want several adjacent tools under one subscription, or you value an established brand over a specialist one. **Choose SupWriter if** you already have a draft, you're working on academic writing where citations and technical terminology must survive intact, you write in a language other than English, or your submission goes through Turnitin or Originality.ai and you can't afford variance. The variance point is the real one. Detector-bypass results that independent testers can't get to agree on — one review clearing Turnitin completely, another seeing 86% AI on the same kind of content — aren't a problem for a blog post. They're a serious problem for a graded submission, where the cost of the one that fails is not proportional to the number that passed. We've written more about that risk math in our piece on [whether Turnitin can detect ChatGPT](/blog/can-turnitin-detect-chatgpt-2026). ## The Verdict For academic and multilingual rewriting, SupWriter. Higher and more consistent bypass rates under a strict all-detectors-must-clear standard, 94% citation preservation, genuine language-specific processing, and a lower entry price than any StealthGPT tier we could find quoted. For generating content from scratch inside a broader toolkit, StealthGPT is the better fit, and we'd rather tell you that than pretend otherwise. And since we're the biased party here: don't take our word for it. Generate a paragraph, run it through both, and check the output against whatever detector actually matters to you. Ninety seconds of your own testing beats any comparison table, including this one. --- *Try SupWriter's [AI humanizer](/ai-humanizer) — 300 words free, no credit card required.* --- Source: https://supwriter.com/blog/supwriter-vs-stealthgpt