Stealthly AI Humanizer
Stealthly AI · Writing · AI Detection
Stealthly AI Humanizer rewrites AI-generated text so it reads like human writing. It runs three rewrite modes and includes a detector that scores the result before you publish.
About Stealthly AI Humanizer
What Is Stealthly AI Humanizer
Stealthly AI Humanizer is an AI text rewriter for drafts that came out of ChatGPT, Claude, Gemini or another model. You paste a draft, choose how hard the rewrite should push, and get back a version that keeps your meaning while changing the sentence shapes and word choices checkers look for. The pitch is narrow: if you need to humanize AI text before publishing, the tool aims to bypass AI detectors without sanding the prose into mush.
The company says its model was trained on more than 10 million texts and that 99.6% of outputs read as human. It also says it has tested against GPTZero, Originality.ai, Turnitin, Copyleaks and ZeroGPT. Treat those numbers as vendor claims. Detector scoring changes month to month, so the only test that counts is your own draft on your own checker.
The free tier is small: 300 words a month and 80 words per request. Anything past that needs a paid plan. Stealthly is built for people who write for school, marketing or publishing and need a clean pass, not for researchers who want to study how detectors behave.
Getting Started
- Go to stealthly.ai and paste your draft into the input box.
- Pick a mode: Light for small edits, Balanced for a normal rewrite, Deep for a heavier rebuild.
- Run the AI detector first if you want a baseline score, then click Humanize.
- Copy the output, check it on your own detector, and rerun with a different mode if the score stays high.
Product Information
A quick look at Stealthly AI Humanizer's pricing, supported platforms, and performance.
Best for
The users, tasks, and scenarios where this tool fits best.
Users
- Students
- Content marketers and bloggers
- Non-English writers
- Teachers and editors
Tasks
- Humanizing an AI draft before publishing
- Checking a passage before you hand it in
- Rewriting technical copy
- Fixing grammar while you humanize
Scenarios
- Finishing a paper the night before it's due
- Keeping a blog schedule without detector flags
- Writing in a second language in one sitting
Key features
Three Rewrite Modes
Light makes small edits and keeps most of your original sentences. Balanced rewrites at a normal depth and suits blog posts, emails and reports. Deep rebuilds sentence structure and vocabulary, which is the mode to try when a checker still flags the first result.
Detector Check in the Same Editor
Stealthly runs its own AI detector next to the humanizer. You can score a draft before rewriting and score it again afterward, and every plan includes detector words, from 300 a month on Free to 500,000 a month on Premium.
Coverage of the Strict Detectors
The site lists GPTZero, Originality.ai, Turnitin, Copyleaks, ZeroGPT, Sapling, Winston AI and Crossplag among the tools its output is meant to clear. That list is where the promise of undetectable AI writing comes from, and it's the claim to test on your own text first.
Word Caps per Request and per Month
Each plan sets two limits. Free allows 80 words per request and 300 a month. Basic moves to 400 and 20,000. Pro allows 1,000 per request and 50,000 a month. Premium allows 2,000 per request and 300,000 a month. Long documents need the higher caps or a split into sections.
Humanizing in Other Languages
The engine handles input in multiple languages and returns the rewrite in the same one. Global teams can keep their own language instead of routing every draft through English, and the output keeps local phrasing rather than a translated tone.
Grammar and Plagiarism Cleanup
The rewrite fixes spelling, punctuation and grammar as it goes, and the company says output stays original enough to pass plagiarism checkers. That second claim is worth verifying with your own tool, since originality scanners and AI detectors measure different things.
Pros and cons
Pros
- The AI detector and the AI humanizer sit on one page, so you can score, rewrite and rescore without buying two subscriptions.
- Three modes give you a graded response: Light for a light touch, Deep when a checker keeps flagging the text.
- The free tier needs no card, which lets you test 300 words on your own material before paying.
- Annual billing cuts the price a lot. Basic drops from $17 to $11 a month and Premium from $49 to $20.
- Output keeps technical terms and numbers, so documentation and product copy don't come back with the meaning sanded off.
Cons
- The free allowance is tiny. 80 words per request is shorter than most paragraphs, and 300 words a month runs out after one short essay.
- There's no public API, so teams that want to batch process files have to use the web editor by hand.
- Detectors update constantly. A mode that clears GPTZero today may not clear it next month, and Stealthly doesn't publish a bypass rate per detector.
- The plagiarism claim is the vendor's own. Nothing on the site shows a third party test, so you still need a separate originality check for academic work.
Frequently asked questions
It rewrites AI-generated text so it reads like human writing and scores lower on AI detectors. You paste a draft from ChatGPT, Claude or Gemini, pick a rewrite mode, and get output that keeps the meaning with different sentence structure and vocabulary. A built-in AI detector lets you check the score before and after.
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