Undetectable AI
Undetectable AI’s AI Detector checks whether text may be AI-generated and identifies ChatGPT, Gemini, Claude, and other models as detectable sources.
What Undetectable AI is
Undetectable AI’s AI Detector checks whether text may be AI-generated and identifies ChatGPT, Gemini, Claude, and other models as detectable sources. The site says it analyzes linguistic, semantic, and pattern signals, supports 50+ languages, and has its highest accuracy in English. The input limit is 10,000 words. The detector page describes a free checker with no signup and instant results, while the pricing page limits the free trial to 250 words and says additional use requires paid plan activation. Separate annual word-count plans include 10K words/month for $5 a year (billed $5.00/mo) and 20K words/month for $9.50 a year (billed $9.50/mo). The service is available on the web, as a browser extension, and through an API. Its free Chrome extension also offers humanization, paraphrasing, question solving, and a human typing simulator, and names Google Docs, LinkedIn, Gmail, Microsoft Word Online, Notion, ChatGPT, and Claude among supported sites. The detector FAQ says submitted text is not stored or used to train models.
Good
- Supports 50+ languages
- Detector accepts up to 10,000 words
- Free detector requires no signup
- API and browser extension are available
Watch out
- Free trial is limited to 250 words
- English is listed as the highest-accuracy language
- Listed annual word-count plans are billed annually
Who it suits
It may suit writers, students, educators, researchers, bloggers, and SEO professionals checking text for possible AI generation. API and extension options may also suit users who want detection in other workflows.
Verdict
The detector offers a no-signup option alongside extension and API access, with a stated 10,000-word input limit. Note the trial limit and English accuracy qualification when deciding whether its results fit your needs.
Plans and prices
From Undetectable AI's own pricing page, checked 3 Oct 2026.
| Plan | Price | What it gives you |
|---|---|---|
| 50K words/month | $21.25 a month | 50K words/month · Includes all features from other plans · $21.25/mo |
| API Starter | $29 a month | 72,500 words included · $0.40 / 1K words after allowance · Standard rate limits · Email support · $29/mo |
| API Growth | $49 a month | 245,000 words included · $0.20 / 1K words after allowance · Higher rate limits · Priority support · $49/mo |
| 10K words/month | $60 a year | 10K words/month · Unlimited AI Detecting · API compatible · $5.00/mo; Charged annually $60.00 |
| 20K words/month | $114 a year | 20K words/month · Unlimited AI Detecting · API compatible · $9.50/mo; Charged annually $114.00 |
| 35K words/month | $189 a year | 35K words/month · Unlimited AI Detecting · API compatible · $15.75/mo; Charged annually $189.00 |
| Business | Priced on request | Non-expiring credits · Redistribution and white labeling · Priority support · API compatible · Custom pricing |
The facts
Each one read from Undetectable AI's own pages, with the date it was checked.
What it does
- API capabilities
- The API page lists text detection, humanization, image, audio, and video detection, plus a writing-style replicator.checked 3 Oct 2026
- API limits
- The API FAQ says the default rate limit is 3 requests per second per IP address, and higher limits can be requested.checked 3 Oct 2026
- Detection languages
- The detector page says it supports 50+ languages, with English offering the highest accuracy.checked 3 Oct 2026
- Detector methods
- The site says its detector uses linguistic, semantic, and pattern-analysis models to identify AI-generated writing.checked 3 Oct 2026
- Extension compatibility
- The extension page names Google Docs, LinkedIn, Gmail, Microsoft Word Online, Notion, ChatGPT, and Claude among supported sites.checked 3 Oct 2026
- Integrations
- The API page says Zapier can connect the service with Google Sheets, RSS feeds, email, and 7,000+ other integrations.checked 3 Oct 2026
- Privacy claim
- The detector FAQ says submitted text is never stored or used to train models, and that business solutions have stricter data-retention controls.checked 3 Oct 2026
- Support
- The API Starter plan includes email support, while the Growth plan includes priority support.checked 3 Oct 2026
- Text limit
- The detector input shows a limit of 10,000 words.checked 3 Oct 2026
- What it does
- The AI Detector checks whether text may be AI-generated and names ChatGPT, Gemini, Claude, and other models as detectable sources.checked 3 Oct 2026
- Who it serves
- The detector page describes use by bloggers, SEO professionals, students, academics, writers, educators, and researchers.checked 3 Oct 2026
Where it runs
- Browser extension
- The free Chrome extension offers AI detection, humanization, paraphrasing, question solving, and a human typing simulator.checked 3 Oct 2026
Money
- Free detector
- The site says its AI Detector is free, requires no signup, and returns instant results.checked 3 Oct 2026
- Trial limit
- The pricing page says the free trial is limited to 250 words and additional use requires paid plan activation.checked 3 Oct 2026
The company
- Headquarters
- 1309 Coffeen Avenue, Sheridan, Wyoming, US 82801checked 28 Sep 2026
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