Undetectable AI

Rewrites AI-generated drafts so they read as human-written, and checks the result against common AI detectors before you use it.

Writing & editing Apps

Checked 25 Sep 2026

Open undetectable.ai

What you'd use it for

Rewriting an AI-drafted piece of text so it reads as human-written and clears common AI detectors, without redrafting it by hand.

Rewrite an AI-generated draft so sentence structure, vocabulary and tone read as human-written
Check a piece of text against common AI detectors and see which sentences would flag before you use it
Paraphrase or shorten a draft as a separate pass from humanising it
Scan an image for AI-generation markers with a heatmap showing which regions triggered the flag
Call the humaniser and detector through an API for bulk or automated use on paid plans

The verdict

Undetectable AI does what it says on the page - paste in an AI-drafted paragraph and get back a version that reads more naturally, and, per third-party benchmarks, clears most common detectors more often than not. Independent testing has found the pass is not durable though - text that clears one detector or one run can trip another, so a genuinely clean result can take more than one pass. The tool itself is competent; the real risk sits in how it is sold, since Trustpilot's dominant complaint (a 2.1 out of 5 rating) is a credit card charged automatically the moment the 250-word free trial is crossed, with cancellation handled by email rather than a settings toggle. It suits someone smoothing an AI-assisted first draft who reads the pricing page closely and is prepared to cancel in writing the same day they stop testing it.

What it costs

Tier	Price	For	Includes
10K words/mo	$5.00/mo billed annually ($9.99/mo billed monthly)	Light, occasional humanising work.	10,000 words/month, passes AI detectors, watermark and "future proof" claims, API access.
20K words/mo	$9.50/mo billed annually ($19.00/mo billed monthly)	Regular use across a moderate volume of drafts.	20,000 words/month, everything in the 10K tier.
35K words/mo	$15.75/mo billed annually ($31.00/mo billed monthly)	Heavier, near-daily use.	35,000 words/month, everything in the lower tiers.
50K words/mo	$21.25/mo billed annually ($42.50/mo billed monthly)	The highest self-serve volume before custom pricing.	50,000 words/month, 6 months free offer at last check.
Business	Custom pricing	Organisations needing bulk, non-expiring credits.	Non-expiring credits, redistribution and white-labelling, priority support.

Read from Undetectable AI's own pricing page on 25 Sep 2026. Vendors change prices without notice.

What you need to start

An account, created by email
A credit card, captured up front and charged automatically once the 250-word free trial is used up

A few minutes to sign up and get a first rewritten paragraph back; the real time cost is reading the billing terms before you hand over a card.

Your first run Paste up to 250 words of AI-written text and click Humanize; a rewritten version and an AI-detection score appear within seconds - that is the whole free run before it asks for a card.

Where it breaks

The pricing page names tiers only by their monthly word allowance, not by a plan name like "Basic" or "Pro" — the tier names above are the word-count figures as shown on the page, not official marketing names. The free trial is limited to 250 words.

First entry in this reference. There is no previous check to compare it against.

When not to use it

Not for academic submissions, client deliverables, or any other context with a disclosure obligation - evading a detector there is not a grey area, it is the exact thing the policy exists to catch. Also not for anyone unwilling to hand over a card and watch it closely, since the tool's most common complaint is a charge landing the instant the free 250-word trial is crossed, with cancellation done by email rather than a button.

Undetectable AI does the opposite job of GPTZero: where GPTZero tries to catch AI-written text, Undetectable AI tries to rewrite it so nothing catches it — pasting in a draft and getting back a version that reads more naturally while, per the site’s own claim, still passing common AI detectors.

The two tools existing side by side, aimed at opposite outcomes, is worth sitting with for a second: this is an arms race, and a business relying on either side of it as a permanent solution is relying on today’s snapshot of a fight that keeps moving.

What it is actually for

The named use cases on the site are broad — essays, SEO content, job applications — which should tell you something about who is buying it. For a business context specifically, the more defensible use is smoothing AI-assisted first drafts so they do not read like a template, not disguising content in a context where honesty about AI use matters (a client deliverable, an academic setting, anywhere detection carries a real consequence).

Pricing structure

Every tier is named by its monthly word allowance rather than a plan name, and the annual-billing discount is roughly 50% off the monthly rate across the board — a pattern common enough in this category that it is worth checking the monthly price before assuming the annual one is what you will actually pay in month one.