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Undetectable AI vs Word Spinner

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, Word Spinner at $9. Both have a free tier. Only Undetectable AI ships a public API.

Undetectable AIRewrites machine-written drafts to read human, with detection scoring built inWord SpinnerRewrites machine-written text to read as human and ships its own detector so you can check the result before you submit it.

Side by side

FactUndetectable AIWord Spinner
CategoryAI Detection & HumanizersAI Detection & Humanizers
Pricing modelFreemiumFreemium
Starts at$9.99 month$9 month
Public APIYesNo
PlatformsWeb, API, Chrome ExtWeb, Chrome Ext
CompanyUndetectable Inc.—
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

Word Spinner

Pairing the humanizer with a detector in one product is the sensible arrangement — you rewrite, then check, without paying two vendors. The 100-language coverage and the in-place Chrome extension are genuine conveniences. The category itself is the problem: detector scores from the same vendor that sold you the rewrite are not independent evidence, and detection tools change faster than any humanizer keeps up with.

Pros

  • Humanizer and detector in a single subscription
  • Tone controls and a grammar pass alongside the rewrite
  • Around 75 templates for blog, email and social formats
  • Chrome extension rewrites in place
  • About 1,000 free words with no card before committing

Cons

  • The bundled detector is not independent verification of the bundled rewriter
  • Pricing page renders nothing to a crawler, so figures come from third-party listings
  • No API and no bulk workflow
  • No company name or country published anywhere

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 Word Spinner if you need

  • Editing machine drafts into copy that reads naturally
  • Multilingual rewriting across 100+ languages
  • Rewriting inside another site via the browser extension

More comparisons

All Undetectable AI alternatives →All Word Spinner alternatives →Browse all AI Detection & Humanizers →