Undetectable AI
Detect AI-written text and rewrite it to read as human writing
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Pricing
Free · from $5/mo
Free trial
Yes
API
Yes
Company
Undetectable Inc.
Platforms
What is Undetectable AI?
Undetectable AI is a platform that checks text for signs of AI generation and rewrites it so it reads like human writing. You paste text or upload a file. The detector shows which sentences are likely to be flagged, and the humanizer rewrites those parts by changing sentence structure, vocabulary and tone.
Beyond text, the suite includes an AI image detector, an AI audio detector, a fake PDF detector, a paraphrasing tool, an AI essay writer, a human auto typer and an AI job applier. A Chrome extension brings the tools into Google Docs, Gmail and other web pages. English gives the most accurate results, and the tools support 50+ languages.
Paid plans are priced by monthly word allowance and include unlimited AI detection and API compatibility. Students, content writers, marketers and business owners are the main users. For businesses there are custom plans with non-expiring credits and white labeling.
Key features
- Sentence-level AI text detection
- AI humanizer that rewrites structure, vocabulary and tone
- AI image, audio and video detection
- Fake PDF, receipt and ID detectors
- Paraphrasing tool and AI essay writer
- Human auto typer
- Chrome extension for Google Docs and Gmail
- Support for 50+ languages
Use cases
Who it's for
Checking writing before submission
Scan an essay or report to see which sentences detectors may flag, then revise them.
Making AI drafts read naturally
Rewrite stiff, AI-assisted drafts for blogs, emails or proposals so they sound more natural.
Verifying images and documents
Check whether an image, audio clip or PDF was AI-generated or edited before you trust or share it.
Reselling humanization at scale
Businesses can buy bulk non-expiring credits and white-label the service.
Undetectable AI pricing
From the vendor's site, checked Nov 8, 2026; we re-check prices monthly. Prices change — confirm on their pricing page.
10K words
month
$5.00/mo billed yearly ($60/yr); $9.99/mo monthly
- 10K words/month
- Unlimited AI detecting
- Unlimited Human Auto Typer
- API compatible
20K words
month
$9.50/mo billed yearly ($114/yr); $19.00/mo monthly
- 20K words/month
- Writing level matching
- Unlimited AI detecting
35K words
month
$15.75/mo billed yearly ($189/yr); $31.00/mo monthly
- 35K words/month
- Unlimited AI detecting
50K words
month
$21.25/mo billed yearly; $42.50/mo monthly
- 50K words/month, scalable to 380K
- Includes all features from other plans
Business
custom
Custom
- Non-expiring credits
- Redistribution & white labeling
- Priority support
- Access to Smart Job Applier
Get an email when Undetectable AI changes its prices
One mail per change, a stop link in each. Nothing else.
How Undetectable AI compares
- Undetectable AI has a free plan, like 3 of the 4 alternatives below.
| Tool | Starts at | Free plan | Free trial | API | Open source | |
|---|---|---|---|---|---|---|
| UUndetectable AI | $5/mo | — | ||||
H HIX Bypass | $9.99/mo | — | Undetectable AI vs HIX Bypass | |||
B BypassGPT | — | — | — | Undetectable AI vs BypassGPT | ||
W WriteHuman | $12/mo | — | — | Undetectable AI vs WriteHuman | ||
| SStealthGPT | — | — | — | — | Undetectable AI vs StealthGPT |
The closest alternatives in our directory by category. “Starts at” is the cheapest paid plan per month, as each vendor lists it.
Pros and cons
Strengths
- Annual plans start at $5/mo for 10K words
- Unlimited AI detection on paid plans
- Money-back guarantee if humanized output is flagged
- Chrome extension works in Google Docs and Gmail
Limitations
- Free trial is limited to 250 words
- Accuracy is highest in English
- Monthly billing costs about twice the annual rate
Undetectable AI FAQ
Is Undetectable AI free?
You can start free. The free trial is limited to 250 words, and anything beyond that needs a paid plan.
How much does it cost?
Paid plans start at $5/mo billed yearly ($9.99 billed monthly) for 10K words a month. Business plans have custom pricing.
Is there a refund guarantee?
Yes. If humanized output is flagged as not human, the cost of that humanization is refunded.
Does it support languages other than English?
Yes. It supports 50+ languages, and English gives the highest accuracy.
Is there an API or browser extension?
Yes. Paid plans are API compatible, and there is a Chrome extension.
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Undetectable AI
Free · from $5/mo
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