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AI Humanizer.io vs StealthGPT

Two fact sheets from our own research, side by side — pricing, platforms, API access and status re-checked by us rather than quoted from the vendors. Only AI Humanizer.io is free. Only StealthGPT ships a public API.

AI Humanizer.ioFree rewriter that reworks AI-generated text to read as human and to slip past AI detectors.StealthGPTRewrites AI-generated text to slip past AI detectors

Side by side

FactAI Humanizer.ioStealthGPT
CategoryAI Detection & HumanizersAI Detection & Humanizers
Pricing modelFreePaid
Public APINoYes
PlatformsWebWeb, API, Chrome Ext
Company—XYZ AI Inc.
Launched—2023
Last verifiedSep 6, 2026Sep 6, 2026

What our research says

AI Humanizer.io

A no-signup humanizer whose whole selling point is beating academic and editorial AI detectors. That makes it useful for the narrow case of rewriting stiff drafts and reckless for the case it actually advertises. There is no company name, no terms we could read and no accountability behind it, which matters if you are relying on the output.

Pros

  • No sign-up, no card and no advertised word limit
  • Handles output from any model, not one vendor's format
  • Explicitly targets the detector families people actually get scored against

Cons

  • The site refuses automated access (HTTP 403), so nothing could be verified first-hand
  • No company, jurisdiction, terms or privacy policy we could read
  • Zero-percent detection claims are unverifiable and detectors change constantly
  • A free tool with no business model means no guarantee it will exist next term

StealthGPT

The only thing here that competitors do not match is the developer surface — REST API, MCP server and n8n node — so this is the humanizer you pick if you are automating a content pipeline, not the one you pick to write an essay. Everything it sells is a bet on an arms race the detector vendors are also funding.

Pros

  • Genuine developer stack — documented API reference plus an MCP server, which rivals lack
  • Bundled detector lets you check before and after in one place
  • Chrome extension humanizes directly in any text field
  • Enterprise tier handles up to 20,000 words per run

Cons

  • Pricing page is behind a Vercel bot check, so prices cannot be compared without signing up
  • Daily request caps sit behind plans that market themselves as unlimited
  • Rewriting reliably flattens nuance and introduces awkward phrasing that needs an editing pass
  • Positioning around beating Turnitin invites institutional and reputational risk

Which one fits

Choose AI Humanizer.io if you need

  • Loosening up stiff, repetitive machine drafts before editing them yourself
  • A quick free pass with no account to create
  • Comparing detector-score behaviour against a paid humanizer

Choose StealthGPT if you need

  • Content operations running bulk rewriting through an API or n8n workflow
  • Non-native English writers softening obviously templated LLM prose
  • Agencies that need humanizing inside an existing WordPress or Zapier stack

More comparisons

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