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Clever AI Humanizer 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 Clever AI Humanizer is free. Only StealthGPT ships a public API.

Clever AI HumanizerFree rewriter for AI-generated text, up to 3,000 words a pass, in English and Spanish.StealthGPTRewrites AI-generated text to slip past AI detectors

Side by side

FactClever AI HumanizerStealthGPT
CategoryAI Detection & HumanizersAI Detection & Humanizers
Pricing modelFreePaid
Public APINoYes
PlatformsWebWeb, API, Chrome Ext
CompanyCleverFiles Inc.XYZ AI Inc.
Launched—2023
Last verifiedSep 6, 2026Sep 6, 2026

What our research says

Clever AI Humanizer

A free humanizer with an actual named US company behind it, which puts it a step above the anonymous crowd in this category. The 3,000-word window and change highlighting make it practical for editing rather than blind pasting. Two languages only, and being free with no visible revenue means no promises about uptime or longevity.

Pros

  • Up to 3,000 words per request, larger than most free tiers allow
  • Highlights the changes it made instead of returning an opaque block
  • Three rewrite styles: Normal, Clear & Structured, Simple Formal
  • Named operator — CleverFiles Inc., New Castle, Delaware — with file upload and run history

Cons

  • English and Spanish only
  • No API, no browser extension, no mobile app
  • Free with no stated business model, so continuity is uncertain
  • Rewriting to defeat detectors remains a policy problem wherever detectors are used

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 Clever AI Humanizer if you need

  • Loosening up long machine drafts before you edit them yourself
  • Spanish-language as well as English rewriting
  • Seeing exactly which phrases were changed rather than getting an opaque rewrite

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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