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Undetectable AI vs WriteHuman

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. Undetectable AI starts at $9.99, WriteHuman at $12. Both have a free tier. Both ship a public API.

Undetectable AIRewrites machine-written drafts to read human, with detection scoring built inWriteHumanRewrites AI-generated text to read as human and scores it against detector models

Side by side

FactUndetectable AIWriteHuman
CategoryAI Detection & HumanizersAI Detection & Humanizers
Pricing modelFreemiumFreemium
Starts at$9.99 month$12 month
Public APIYesYes
PlatformsWeb, API, Chrome ExtWeb, Chrome Ext, iOS, Android, API
CompanyUndetectable Inc.WriteHuman
Launched2023—
Last verifiedSep 6, 2026Sep 6, 2026

What our research says

Undetectable AI

Buy it only if you accept that passing a detector is a moving target: detector vendors retrain constantly, and text that cleared last month can flag next month. As a multi-format detection dashboard it is more defensible than as a bypass tool.

Pros

  • Detector and rewriter run in one pass, so you see which sentences changed and why
  • Coverage extends past text into image, voice, video and document classifiers
  • Browser extension works inside Docs and Gmail rather than a separate tab
  • Entry tier is genuinely cheap at annual rates

Cons

  • Rewrites often flatten voice and add filler to break statistical patterns
  • Detection on short passages is unreliable in both directions
  • Word quotas drain fast because rejected attempts still consume them
  • The free trial caps at 250 words, barely enough to judge output quality

WriteHuman

As humanizers go this one is unusually transparent about its own scoring, showing per-sentence detection probability instead of a single vague pass mark, and its surface area — extension, mobile apps, API, MCP — is wider than most rivals. The catch is what the tool is for: passing AI-detection checks breaches most academic integrity policies, and no vendor can guarantee any detector's verdict.

Pros

  • Sentence-level detection scores rather than a single opaque verdict
  • Chrome extension, iOS and Android apps, plus a documented API and MCP access
  • Free tier lets you judge output quality before paying
  • Annual billing cuts the effective monthly rate by roughly a third

Cons

  • Request counts and word caps are tight on the lower tiers
  • Detector outcomes are probabilistic and shift as detectors are retrained
  • Use is disallowed by most academic integrity policies

Which one fits

Choose Undetectable AI if you need

  • Marketers cleaning up bulk LLM drafts before publishing
  • Editors wanting a second opinion on submitted copy
  • Teams screening images and audio for synthetic origin
  • Non-native writers smoothing register and tone

Choose WriteHuman if you need

  • Editing machine drafts into prose that sounds less uniform
  • Non-native writers smoothing generated text across 40-plus languages
  • Developers who want rewriting inside their own pipeline via the API

More comparisons

All Undetectable AI alternatives →All WriteHuman alternatives →Browse all AI Detection & Humanizers →