Launched 2023 · Verified Oct 15, 2026

Undetectable AI

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AI Detection & Humanizers Write a reviewUnited StatesEffect71/ 100

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Rewrites machine-written drafts to read human, with detection scoring built in

ai humanizer ai detection paraphrasing plagiarism checkdeepfake detectionFreemium · from $9.99/mo

Listed on EffectHub · Aug 16, 2026

Web · API · Chrome extension

Screenshot of the Undetectable AI website — undetectable.ai as we captured it — our own screenshot, not the vendor’s press image.

Pricing

Pricing model: Freemium
Paid options from: $9.99/mo
Billing: Monthly

Humanizer plans are metered by words per month: $9.99/month for 10K words billed monthly, or $5/month charged $60 annually; tiers step up to 20K ($19), 35K ($31) and 50K ($42.50) words. The free trial is limited to 250 words, and business plans sell non-expiring credits.

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Overview

About Undetectable AI

The service scores a passage for machine authorship, marks the sentences that trigger detectors, then rewrites those sections at a chosen reading level and register. Beyond text it sells classifiers for images, audio, video and documents, and ships a browser extension that runs inside Google Docs and Gmail. Rewriting is metered by words per month, and both the humanizer and the detector are exposed over an API.

Platforms: Web · API · Chrome extension
API: Yes
Last verified: Oct 15, 2026

Verified sources

Pricing page: $9.99 per month for 10K words (or $5/mo charged $60 annually), $19 for 20K, $31 for 35K, $42.50 for 50K words; free trial limited to 250 words; non-expiring credits listed for business (15 October 2026)undetectable.ai ↗
Footer: 2026 Undetectable Inc., 1309 Coffeen Avenue, Sheridan, Wyoming, US (15 October 2026)undetectable.ai ↗
Humanizer and detection APIs offered to developersundetectable.ai ↗
Founded 2023 with public launch in May 2023en.wikipedia.org ↗

Fact check

Is Undetectable AI legit?

We don’t label tools safe or unsafe. Below are the records we checked ourselves, each with the date we read it.

Domain registered: Jan 23, 2023 (3 years ago)Registry record (RDAP), registrar GoDaddy.com, LLC, looked up Sep 6, 2026
TLS certificate: Issued by Let's Encrypt, valid until Dec 13, 2026Seen in our own connection to the site on Oct 15, 2026
Last checked: Oct 15, 2026The site answered
On the market since: 2023The vendor's own material, read by us
Operated by: Undetectable Inc., United StatesOur research, card verified Oct 15, 2026

How we collect these records

Editorial verdict

Pros & cons of Undetectable AI

high confidence

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

Best for

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

Not for

Academic submissions, where institutions treat this as misconduct regardless of the output
Anyone needing an auditable, defensible verdict on authorship
Technical copy where rewrites blur precise terminology

Watch out: Monthly word credits expire unused; only the business plan sells credits that carry over.

#16inAI Detection & Humanizers· of 28 tools, ranked by rating and popularity

Neighbours

Alternatives to Undetectable AI

All Undetectable AI alternatives →

StealthGPT67Rewrites AI-generated text to slip past AI detectorsNot rated yet

SuperHumanizer77Free in-browser rewriter that reworks AI-generated text to read as human, with paid tiers for longer runs and a detector.Not rated yetFrom $12/mo

EssayCheck77Free, no-account essay checker that scores AI likelihood, grades against a rubric and fixes grammarNot rated yetFree

Verva77Rewrites AI-generated text to read as human-written and pass AI detectors.Not rated yetFrom $8/mo

Humanio AI77Rewrites AI drafts to read as human prose, with a built-in detector check, sold by weekly word allowance.Not rated yetFrom $6.99/wk

Humanize Max69Free AI-text rewriter with four styles, term locking and no account or sign-up, up to 2,000 words a pass.Not rated yetFree

Lunchbreak AI69Checks essays against Turnitin, GPTZero and other detectors, then rewrites flagged passages to read as human-written.Not rated yetFrom $10/mo

GPTZero71Estimates whether text was machine-written and flags the sentencesNot rated yetFrom $12.99/mo

Undetectable AI head-to-head

Side-by-side fact sheets against the competitors our research or their makers name — pricing, platforms, API and both verdicts on one page.

Tasks

Also used for

AI Detection20 AI Humanizer23 Paraphrasing19 Plagiarism Check9

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