What is Undetectable AI?
Undetectable AI is a web platform built around two main jobs: checking whether a text or image was produced by AI, and rewriting AI-generated text so it sounds more natural and scores as human-written on common AI detectors. You paste text or upload a file, the AI Detector highlights which sentences look machine-generated, and the AI Humanizer produces a rewritten version you can review before submitting or publishing.
Beyond text, the site lists an AI Image Detector, an AI Audio Detector, a Fake PDF Detector and a Chrome extension that brings the tools into Google Docs, Gmail and other web pages. The homepage also mentions a paraphrasing tool, an AI essay writer and an API for business use. Pricing is monthly word-based, with a free trial limited to 250 words.
Key features
- Detects AI-generated text and highlights suspicious sentences
- Humanizer rewrites AI text to read more naturally
- AI image detection for checking whether a picture is AI-made
- AI audio/voice detection
- Fake PDF detection
- Chrome extension that works inside Google Docs, Gmail and web pages
Who is it for
- Students and educators
- Professionals writing emails, reports and proposals
- Content writers and marketers
- Business owners scaling content output
How to get started with Undetectable AI
- Go to the Undetectable AI website and choose Start FREE Trial.
- Paste your text into the field on the page or upload a file.
- Run the AI detection or humanization on the text.
- Review the flagged sentences and edit the text before submitting.
- You want to check which sentences in a paper or article look AI-generated.
- You need to rewrite robotic text into a more natural style while keeping its meaning.
- You work in Google Docs or Gmail and want to use the Chrome extension.
- You need a permanently free tool, because the free trial is limited to 250 words and requires a paid plan afterward.
- You work with large volumes of text and don't want to pay for a higher monthly word plan.
Pros and cons
- Covers text, image, audio and PDF checks in one place
- Chrome extension keeps tools available while working online
- Free trial is limited to 250 words
- Paid plans are word-based and expire monthly unless bought as bulk credits
Undetectable AI pricing
| Plan | Price | Includes |
|---|---|---|
| Plan 1 | 5.00 USD / month | 10K words/month, billed annually at 60.00 USD; 9.99 USD monthly before 50% discount; includes AI detecting and humanizer features |
| Plan 2 | 9.50 USD / month | 20K words/month, billed annually at 114.00 USD; 19.00 USD monthly before discount |
| Plan 3 | 15.75 USD / month | 35K words/month, billed annually at 189.00 USD; 31.00 USD monthly before discount |
| Plan 4 | 21.25 USD / month | 50K words/month; 42.50 USD monthly before discount; includes all features from other plans; 6 months free, cancel anytime |
Prices copied from Undetectable AI pricing, checked October 12, 2026. Currency as shown by the vendor; taxes may apply.
Undetectable AI pricing details →
Is Undetectable AI free?
There is a free trial. Free trial limited to 250 words; additional usage requires a paid plan.
Undetectable AI alternatives
| Tool | Price from | Free plan | Category |
|---|---|---|---|
 GPTZero | not listed | yes | AI detectors |
 Originality.ai | 12.95 USD/mo | yes | AI detectors |
 ZeroGPT | not listed | yes | AI detectors |
 Turnitin | not listed | ? | AI detectors |
 Copyleaks | 13.99 USD/mo | trial | AI detectors |
 QuillBot | not listed | ? | Writing & editing |
All alternatives to Undetectable AI →
Comparisons
- GPTZero vs Undetectable AI
- ZeroGPT vs Undetectable AI
- Turnitin vs Undetectable AI
- Copyleaks vs Undetectable AI
FAQ
What is Undetectable AI used for?
Detects AI-generated text and images and rewrites AI writing so it reads as human, for students, writers and professionals.
Is Undetectable AI free?
There is a free trial. Free trial limited to 250 words; additional usage requires a paid plan.
How much does Undetectable AI cost?
The cheapest paid plan is 5.00 USD/mo (vendor pricing, October 12, 2026).
What are the best Undetectable AI alternatives?
Closest alternatives: GPTZero, Originality.ai, ZeroGPT, Turnitin, Copyleaks.
Data checked October 12, 2026 on the vendor website (undetectable.ai).