At similar prices Lumi includes more words: $29.90 buys 100,000 words a month (StealthGPT Pro: 50,000 for $29.99), and $49.90 buys unlimited words (StealthGPT Max: 200,000 for $49.99). StealthGPT has more extras, like an iOS app, weekly plans and a money-back policy if text gets flagged.
300 free words when you sign up · Facts checked October 18, 2026
List prices in US dollars before tax, as each company's own pages showed them on October 18, 2026. Where a page doesn't say, we write "Not stated". Numbers in brackets link to the sources at the bottom.
| Feature | UsLumi Humanizer | StealthGPT |
|---|---|---|
| Cheapest plan, monthly billing | $9.90/mo[1] Starter, 10,000 words a month | $29.99/mo[3] Pro, 50,000 words a month |
| Cheapest plan, yearly billing | $6.00/mo[1] $72.00 billed yearly | $24.99/mo[3] Pro, billed yearly |
| What about $50 a month buys | Unlimited words for $49.90/mo[1] Up to 3,000 words per request | 200,000 words for $49.99/mo[3] Max plan, 2,000 words per request |
| Words per month, by plan | 10,000 / 100,000 / Unlimited[1] Starter / Pro / Unlimited | 50,000 / 200,000 / 1,000,000+[3] Pro / Max / Enterprise. Weekly plans also exist. |
| Words per request, by plan | 500 / 1,000 / 3,000[1] Starter / Pro / Unlimited | 1,000 / 2,000 / 10,000+[3] Pro / Max / Enterprise |
| Languages | English only | 100+[3] The same page also says "50+" and "all languages" |
| Free option | 300 free words Added to your account when you sign up | $1 for 3 days[3] Paid trial of Pro or Max |
| Refunds | No refunds[2] Cancel anytime; you keep access until the end of the paid period | Non-refundable, with a "detected?" policy[4] Money back for the current cycle with a screenshot from an accepted detector |
| Also included | AI detector, paraphraser, grammar checker, plagiarism checker[1] On every plan. No Chrome extension or public API. | AI detector, iOS app, Chrome extension, MCP[3] API on the Enterprise plan |
StealthGPT
Lumi Humanizer
Pick StealthGPT if
Pick Lumi if
StealthGPT is built around extras: apps, weekly billing and a detector-based refund policy. Lumi gives more words for the money on every comparable plan and starts much cheaper. If you rewrite regularly, Lumi's monthly plans cost less. If you need a phone app, StealthGPT has one.
Quick answers about Lumi Humanizer vs StealthGPT.
Yes, on every comparable plan. Lumi starts at $9.90 a month, and its $29.90 plan includes 100,000 words, against 50,000 on StealthGPT Pro at $29.99. At about $50, Lumi has unlimited words and StealthGPT Max has 200,000.
Lumi gives 300 free words when you sign up. StealthGPT offers a paid trial: $1 for 3 days.
Lumi does not offer refunds, but you can cancel anytime. StealthGPT says purchases are non-refundable, with a separate money-back policy for the current billing cycle if you send a screenshot showing your text was flagged by an accepted detector.
StealthGPT has an iOS app and a Chrome extension. Lumi works in the browser and has no app or extension yet.
Still have questions? Visit our help center or read our blog guides.
Plans change often. If something here is out of date, email contact@lumihumanizer.com and we'll fix it.
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