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ProofWrite 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. ProofWrite publishes a starting price ($9.99); StealthGPT does not. Only ProofWrite has a free tier. Only StealthGPT ships a public API.

ProofWriteRewrites AI-generated text to read more naturally and pass detectors like Turnitin, GPTZero, and Originality.ai.StealthGPTRewrites AI-generated text to slip past AI detectors

Side by side

FactProofWriteStealthGPT
CategoryAI Detection & HumanizersAI Detection & Humanizers
Pricing modelFreemiumPaid
Starts at$9.99 month—
Public APINoYes
PlatformsWebWeb, API, Chrome Ext
Company—XYZ AI Inc.
Launched—2023
Last verifiedSep 1, 2026Sep 6, 2026

What our research says

ProofWrite

ProofWrite is built around one specific job: getting AI-written text past detection tools while keeping the meaning intact, verified against a stated list of detectors rather than a vague claim. The catch is that detector behavior changes over time, so passing today's check doesn't guarantee it holds up against a future detector update, and 250 free words isn't much to evaluate quality on your own text.

Pros

  • checks output against seven named detectors rather than just one
  • eight writing modes for different tones, including academic, formal, and blog
  • free tier and no-card signup to test before paying

Cons

  • detector-passing behavior can change whenever those detectors update their models
  • only 250 free words to evaluate before hitting a paywall
  • unlimited-word tier requires the top Ultra plan

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 ProofWrite if you need

  • students and academics needing text that reads naturally
  • SEO writers and content teams producing high volumes of AI-assisted copy
  • anyone needing output checked against multiple named detectors at once

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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