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Originality.AI vs Undetectable AI

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. Originality.AI starts at $14.95, Undetectable AI at $9.99. Only Undetectable AI has a free tier. Both ship a public API.

Originality.AIAI-text and plagiarism detection built for publishers and agenciesUndetectable AIRewrites machine-written drafts to read human, with detection scoring built in

Side by side

FactOriginality.AIUndetectable AI
CategoryAI Detection & HumanizersAI Detection & Humanizers
Pricing modelPaidFreemium
Starts at$14.95 month$9.99 month
Public APIYesYes
PlatformsWeb, Chrome Ext, APIWeb, API, Chrome Ext
CompanyOriginality.AIUndetectable Inc.
Launched20222023
Last verifiedSep 6, 2026Sep 6, 2026

What our research says

Originality.AI

The detector to pick if you are a publisher or agency policing freelance output at volume, because the team history and writing replay matter more than the raw score. Do not use it to accuse a student; no detector is accurate enough to carry that weight.

Pros

  • Credit model is legible: 100 words per credit, no hidden weighting
  • API on the higher tier makes batch pipelines possible
  • Chrome extension works inside Google Docs, where the writing actually happens
  • Writing replay from revision history is process evidence, not just a score

Cons

  • Monthly subscription credits expire, so a light month is wasted spend
  • The jump from $14.95 to $179 a month is a steep single step
  • False positives on heavily edited or non-native English writing are a documented hazard across every detector
  • Accuracy benchmarks are largely vendor-run

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

Which one fits

Choose Originality.AI if you need

  • Content agencies auditing freelance submissions before they pay for them
  • Publishers sweeping large archives for machine-written pages
  • SEO teams screening acquired, syndicated or outsourced content

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

More comparisons

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