Freemium

Undetectable AI

Detects AI content across text, image, audio and video, and also rewrites text to evade detection.

3.2 Writing
3.2 Good 3.2
Detection across image, audio and video, not just text Ships a humanizer for evading detection, with students among named users
Reviewed by Challenging Voice Editorial · Updated Aug 2026 How we rate
PricingFree
Free planYes
CompanyUndetectable Inc.
PlatformsChrome Extension, Web
CategoryWriting
Last reviewedAug 2026
Ask AI about Undetectable AI ChatGPT Claude Perplexity

Overview

Undetectable AI runs both halves of the detection question. It detects AI-generated text and flags which sections are suspect, and it detects AI-generated images, audio and video, with a fake PDF detector alongside. It also ships a humanizer that rewrites flagged text to read as human-written, plus paraphrasing, plagiarism checking, an essay writer and a job applier.

The detection side is genuinely useful and increasingly hard to do. Image, audio and video detection matters far beyond academia, for anyone verifying whether a recording or a document is what it claims to be, and a fake PDF detector is aimed at a real and growing fraud problem.

The humanizer is the part to be clear about. It exists to make generated text pass AI detectors, students are among the named users, and submitting rewritten work is academic misconduct at essentially every institution. Undetectable Inc. is a named Wyoming company with a broad detection product line, which distinguishes it from the unattributed bypass sites, but the tool is on the same page as the detector. Pricing shows free and paid tiers without figures.

Key features

  • AI text detection with flagged sections
  • Image, audio and video AI detection
  • Fake PDF detector
  • AI humanizer that rewrites to evade detection
  • Paraphrasing, plagiarism checking and Chrome extension

Screenshots & demo

Undetectable AI screenshot 1

Pricing

Undetectable AI offers a free plan, with paid upgrades for higher limits and more features.

  • Pricing modelFreemium
  • Starting priceFree
  • Free planYes
Visit Undetectable AI

Pricing is provided as a guide. Check the official site for the latest plans.

Is Undetectable AI expensive?

Undetectable AI has no advertised paid tier. Among the 109 priced tools we list in Writing, the median entry price is $12 a month.

66% of Writing tools in the directory offer a free tier, and this is one of them.

Compared against every priced listing in Writing, recalculated as the catalogue changes. Method and the full market breakdown are in our AI tool pricing study.

Pros & cons

Pros

  • Detection across image, audio and video, not just text
  • Fake PDF detection targets a real and growing fraud problem
  • Free tier available before any payment

Cons

  • Ships a humanizer for evading detection, with students among named users
  • Submitting rewritten work is academic misconduct at most institutions
  • No pricing figures published on the landing page

How it compares

ToolRatingFreeFromBest known for
Undetectable AI (this tool)3.2YesFreeAI text detection with flagged sections
StealthWriter2.9Yes$20/moAI humanizer with light, medium and aggressive modes
Netus AI3.6Yes$30/moAI Detection Bypasser that rewrites flagged text to read as human-written
MyDetector2.4Yes$6.99/moFree AI detection on pasted or uploaded content

Alternatives to Undetectable AI

4 tools matched to Undetectable AI on what they do, their category and their price.

Netus AI

3.6

AI paraphrasing and humanizing tool that rewrites text to read as human-written and pass AI detection.

Freemium Writing

Frequently asked questions

What is Undetectable AI?
Undetectable AI runs both halves of the detection question.
Is Undetectable AI free?
Yes, Undetectable AI offers a free plan. Paid plans unlock more features and higher usage limits.
What are the best Undetectable AI alternatives?
The closest matches in the directory are StealthWriter, Netus AI, and MyDetector, compared side by side above.

Reviews

3.2 Editorial rating No reviews yet

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