Mask AI is the better value for most writers: one Unlimited plan at $19.99/mo (or $10.99/mo billed annually), three rewrite levels, side-by-side review, and plagiarism tools. StealthGPT costs more, from $29.99/mo, but adds 100+ languages, an iOS app, a Chrome extension, and MCP access. Neither can guarantee results on every AI detector.
Choose Mask AI if you want a simple, lower-priced humanizer with control over how much of your draft changes. Choose StealthGPT if you write in several languages, want a mobile app and browser extension, or want to run the humanizer from Claude or Cursor.
| Tool | Starting price | Free access | Word limits | Best for |
|---|---|---|---|---|
| Mask AI | $19.99/mo monthly, or $10.99/mo billed annually | Free plan: 600 humanization words (trial converts to paid after 5 days) | Up to 1,500 words per request | Writers and marketers who want rewrite control and one flat plan |
| StealthGPT | Pro $29.99/mo | No free plan listed | 1,000 words per request on Pro, 50,000 words per month | Multilingual writers, students, and content teams that want mobile and MCP access |
Both tools include a built-in AI detector, so you can check a rewrite before you use it. Detector results vary by text and by tool, and the "passes as human" claims come from the vendors, so always review important text yourself and follow any AI-use rules set by your school, employer, or platform.
Mask AI rewrites a draft from ChatGPT, Claude, Gemini, or your own notes. You choose a rewrite level (Light, Medium, or Aggressive) and a tone, then review the result side by side with the original before you publish. It also includes an AI content detector, plagiarism checks and removal, and content generation.
Price: Free plan with 600 AI humanization words and 250 words per generation (the trial converts to $19.99/mo after 5 days). Unlimited is $19.99/mo billed monthly or $10.99/mo billed annually ($131.88/yr). Best for: Writers, students, marketers, and content teams who draft with AI and want the output to read smoothly.
StealthGPT rewrites AI-generated text so it reads with a more natural tone, rhythm, and sentence variation while keeping the original meaning. A built-in detector lets you check the result, and every plan includes 100+ languages, an iOS app, a Chrome extension, and MCP access.
Price: Pro $29.99/mo (50,000 words), Max $49.99/mo (200,000 words, 3 teammate seats), Enterprise $179.99/mo (1,000,000+ words, API access). Yearly billing saves up to 17.5%. Best for: Writers, students, and content teams who want drafts reworded to sound more natural, with a detector to check the result.
Mask AI gives you more visible control. Its Light, Medium, and Aggressive levels and tone selection set how far the text moves from your draft, and the side-by-side view shows each change. StealthGPT focuses on a one-pass rewrite with a detector check afterwards.
StealthGPT is broader. It lists 100+ languages, an iOS app, a Chrome extension, and MCP access on every plan. Mask AI's listing does not mention a language count, a mobile app, or MCP access.
Mask AI is cheaper. Unlimited at $19.99/mo (or $10.99/mo annually) covers unlimited humanizations with up to 1,500 words per request. StealthGPT Pro is $29.99/mo for 50,000 words a month, and the higher tiers add words, seats, and API access.
Mask AI adds plagiarism checks and plagiarism removal. StealthGPT adds file uploads, history, in-text citations, and custom fine-tuned models on Enterprise.
Pick Mask AI if you humanize drafts regularly, want to approve each change, and prefer one predictable price. Pick StealthGPT if you work across languages, want to humanize from your phone or browser, or want it inside an MCP workflow. For more options, see our AI humanizer tools collection, or read how StealthWriter compares with Undetectable AI.
Which is cheaper, StealthGPT or Mask AI? Mask AI. Unlimited is $19.99/mo, or $10.99/mo billed annually. StealthGPT starts at $29.99/mo.
Do StealthGPT and Mask AI have free plans? Mask AI has a free plan with 600 humanization words, but its trial converts to $19.99/mo after 5 days. StealthGPT lists no free plan.
Do they guarantee text passes AI detectors? No. Detector results vary by text and tool, and both claims come from the vendors. Review important text yourself.
Which supports more languages? StealthGPT supports 100+ languages on every plan.
Are there other humanizers to compare? Yes. StealthWriter, Undetectable AI, and HumanizeAI are also listed.
See Mask AI's full listing → · See StealthGPT's full listing →
Thomas
Founder
Thomas is the founder of AIPick.info and an avid AI enthusiast dedicated to testing and reviewing the latest tools. He believes technology should make life easier and more enjoyable for everyone. Beyond providing practical reviews, Thomas aims to build an uplifting space where AI feels accessible, delivering insights with energy, positivity, and a commitment to helping others innovate with a smile.
