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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.

The short answer

Free plan
Only Clever AI Humanizer (StealthGPT has paid plans only)
Public API
StealthGPT has one; not confirmed by us for Clever AI Humanizer
Higher Trust score
StealthGPT — 86 vs 80 for Clever AI Humanizer
Best fit
Clever AI Humanizer: Loosening up long machine drafts before you edit them yourself · StealthGPT: Content operations running bulk rewriting through an API or n8n workflow
Platforms
Clever AI Humanizer: Web · StealthGPT: Web, Chrome extension, iOS

From our own records as of each tool's last check. Anything we have not confirmed is left out rather than guessed. How we verify

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

Side by side

FactClever AI HumanizerStealthGPT
CategoryAI Detection & HumanizersAI Detection & Humanizers
Pricing modelFreePaid
Public APINot confirmedYes
Trust score80 / 10086 / 100
PlatformsWebWeb, API, Chrome extension, iOS
CompanyCleverFiles Inc.XYZ AI, Inc.
Launched—2023
Last verifiedOct 15, 2026Oct 22, 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. Three 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
  • Several rewrite styles, including Normal and Clear & Structured
  • Named operator — CleverFiles Inc., New Castle, Delaware — with file upload and run history

Cons

  • English, Spanish and Portuguese only
  • Public API is still a waitlist; no browser extension or 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- and Portuguese-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

Clever AI Humanizer vs StealthGPT: the questions people ask

Does Clever AI Humanizer or StealthGPT have a free tier?

Clever AI Humanizer is free to use; StealthGPT has paid plans only.

Which has a public API, Clever AI Humanizer or StealthGPT?

StealthGPT ships a public API, as of our last verification. A public API for Clever AI Humanizer is not confirmed by us — check its developer docs before you plan an integration.

More comparisons

All Clever AI Humanizer alternatives →Browse all AI Detection & Humanizers →