an honest comparison
StealthGPT alternative: SI Humanizer side by side
Looking for a StealthGPT alternative? Here is what StealthGPT offers, what SI Humanizer offers, and which one fits which kind of writer. Facts come from each vendor's public pages; nothing here is a paid placement.
Prices checked on September 26, 2026 · how we compare
The short answer
Choose StealthGPT if you process long documents in one go, need several seats, and do not mind a non-refundable subscription.
Choose SI Humanizer if you want to start free, keep costs at zero for everyday use, and prefer honest limits over detector promises.
StealthGPT vs SI Humanizer at a glance
| StealthGPT | SI Humanizer | |
|---|---|---|
| Free usage | No free allowance stated; paid plans start with a $1 first week for new users | 3 runs a day without an account; 3,000 words a day with a free account |
| Paid plans from | $29.99/month, or $24.99/month billed yearly | Pro coming soon ($9/month planned); free tiers available now |
| Volume | 50,000 to 1,000,000+ words a month | Daily allowance instead of a monthly one |
| Max words per request | 1,000 to 10,000+ words depending on plan | 1,000 words (free), 3,000 (Pro); 1,000 for the 3-version rewriter |
| Modes and styles | A model selector, plus a writer, an agent and "Stealth Insights" | Natural, Casual, Professional, Academic styles with every fix highlighted; click-a-word synonyms in the paraphraser; 3 versions per rewrite |
| Languages | 50+ or 100+ languages (the pricing page states both) | Answers in the language you paste; best in major European languages |
| Built-in AI detector | Yes, built-in AI detector | No. We focus on the writing itself |
| Other tools | Stealth Writer, grammar checker, watermark remover, summarizer, SEO writer, chat with PDF, iOS app, Chrome extension, API on Enterprise | SI Paraphraser, SI Rewriter, SI Summarizer |
| Refunds | All purchases non-refundable; cancellation takes effect at the end of the paid term | Nothing to refund today; failed runs are never counted |
| Your text | Says it never shares your content with detectors or third parties and that generations stay in your account. Training use is not stated. | Text is not stored in our database and not used for training |
| How it presents itself | Calls itself "The AI Humanizer that actually works" and says "We beat every AI Detector". | Makes SI (AI) text read naturally. No promise about AI detectors. |
What StealthGPT does well
- High per-request limits, useful for long documents.
- Multi-seat plans for small teams.
- A $1 first week, so a paid trial costs very little.
- Apps and a Chrome extension, plus writing tools beyond the humanizer.
Operator: XYZ AI, Inc., a New Jersey company with a registered office in Sheridan, Wyoming, according to its terms.
StealthGPT pricing in detail
Prices in US dollars as listed on StealthGPT's pricing page on September 26, 2026. Vendors run promotions and regional prices, so treat these as a snapshot.
| Plan | Monthly | Yearly, per month | Words per month | Max words per request |
|---|---|---|---|---|
| Pro | $29.99 | $24.99 | 50,000 | 1,000 |
| Max (3 seats) | $49.99 | $41.99 | 200,000 | 2,000 |
| Enterprise (5 seats) | $179.99 | $149.99 (billed yearly) | 1,000,000+ | 10,000+ |
Where SI Humanizer is different
A free tier you can actually use every day
3 runs a day with no account, then 3,000 words every day with a free account, across four tools. It refills daily instead of running out after a trial.
Built for readers, not for detector scores
StealthGPT calls itself "The AI Humanizer that actually works" and says "We beat every AI Detector". We take a different line. Our humanizer is designed to edit like a person: vary the rhythm, cut stock phrases, keep your facts and citations. We make no promise about Turnitin, GPTZero or any other detector, because nobody can honestly guarantee one.
Your text is not kept
We send your text to our language model provider to produce the result and do not store it in our database. We log only the tool, the word count and timing. See our privacy policy.
Four focused tools
Besides the SI Humanizer, you get the SI Paraphraser, the SI Rewriter and the SI Summarizer. StealthGPT offers a wider catalogue (stealth Writer, grammar checker, watermark remover, summarizer, SEO writer, chat with PDF, iOS app, Chrome extension, API on Enterprise), so if you need those extras, it may suit you better.
How we compared
We read StealthGPT's homepage, pricing page, terms and privacy policy on September 26, 2026 and recorded only what they state publicly, with prices as displayed on that date. Where the vendor's own pages contradict each other, we say so. We did not run AI detector tests, because scores change from week to week and are not a fair measure of writing quality. We make SI Humanizer, so read this page as an informed but interested view, and check the vendor's page before you buy. Our full rules are in the editorial policy.
StealthGPT alternative FAQ
Is SI Humanizer a free StealthGPT alternative?
Yes. You can humanize 3 texts a day without an account and 3,000 words a day with a free account, up to 1,000 words per run. StealthGPT's free offer, as listed on its site: no free allowance stated; paid plans start with a $1 first week for new users.
Does SI Humanizer bypass AI detectors like StealthGPT says it does?
We do not make that claim. StealthGPT calls itself "The AI Humanizer that actually works" and says "We beat every AI Detector". Detector results change over time and differ between tools, and some flag human writing. We focus on making text read naturally for people, and we suggest you check your school's or client's rules on AI use.
Which one has better prices?
For light, everyday use SI Humanizer costs nothing. For large monthly volumes, StealthGPT's paid plans (from $29.99/month, or $24.99/month billed yearly) offer more capacity than our free tiers today. Our Pro plan is not open yet; you can join the waiting list.
When were these facts checked?
We checked StealthGPT's public pages on September 26, 2026. Prices shown are in US dollars as listed by the vendor and may vary by country, promotion or test. Always confirm on its pricing page before you buy.
See the difference on your own text
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