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Undetectable AI
What Undetectable AI is
Undetectable AI’s AI Detector checks whether text may be AI-generated and names ChatGPT, Gemini, Claude, and other models as detectable sources. The service says it analyzes linguistic, semantic, and pattern signals, supports more than 50 languages, and lists English as the language with its highest accuracy. Detector input accepts up to 10,000 words. The detector page describes a free checker with no signup and instant results, while the pricing page says the free trial is limited to 250 words and that further use requires paid-plan activation. Listed pricing starts at $9.99/mo. Plans also include word-count subscriptions billed annually and monthly API tiers. Undetectable AI is available on the web, as a browser extension, and through an API. Its free Chrome extension adds humanization, paraphrasing, question solving, and a typing simulator; named compatible sites include Google Docs, LinkedIn, Gmail, Microsoft Word Online, Notion, ChatGPT, and Claude. The API lists text, image, audio, and video detection, humanization, and a writing-style replicator. The detector FAQ says submitted text is not stored or used to train models.
Who it suits
The detector suits bloggers, SEO professionals, students, academics, writers, educators, and researchers who want to check text for possible AI generation. The extension and API may suit people who want detection or related tools in other workflows.
What it does well
- Free detector requires no signup.
- Accepts text up to 10,000 words.
- Supports more than 50 languages.
- Available on web, as an extension, and through an API.
- FAQ says text is not stored or used for training.
What to know first
- Free trial is limited to 250 words.
- English is listed as the highest-accuracy language.
- Additional use requires paid-plan activation.
Limits
The free trial accepts 250 words, after which paid-plan activation is required. API access has a default limit of three requests per second per IP address; higher limits can be requested.
Plans
| Plan | Billed and limits | Price |
|---|---|---|
| 20K words/month | $9.50/mo; Charged annually $114.00 · 20K words/month · Unlimited AI Detecting · API compatible | $114 a year |
| 35K words/month | $15.75/mo; Charged annually $189.00 · 35K words/month · Unlimited AI Detecting · API compatible | $189 a year |
| 50K words/month | $21.25/mo · 50K words/month · Includes all features from other plans | $21.25 a month |
| API Starter | $29/mo · 72,500 words included · $0.40 / 1K words after allowance · Standard rate limits · Email support | $29 a month |
| API Growth | $49/mo · 245,000 words included · $0.20 / 1K words after allowance · Higher rate limits · Priority support | $49 a month |
| 10K words/month | $5.00/mo; Charged annually $60.00 · 10K words/month · Unlimited AI Detecting · API compatible | $60 a year |
| Business | Custom pricing · Non-expiring credits · Redistribution and white labeling · Priority support · API compatible | On request |
As undetectable.ai lists them, read 3 Oct 2026. The maker's own page has the final word.
Getting started
- Open the web AI Detector
- Paste text or upload a file
- Use the free 250-word trial without signup
- Install the Chrome extension for supported sites
- Choose an annual word-count plan or monthly API plan for additional use
- Connect workflows through the API or Zapier
Verdict
Undetectable AI offers a no-signup detector alongside extension and API options, but its free trial is capped at 250 words. Consider the language accuracy note and listed paid pricing when choosing how to use it.
Questions
Is Undetectable AI free?
The detector is offered free without signup, and a free trial is listed. The trial is limited to 250 words; listed paid access starts at $9.99/mo.
Which platforms are supported?
Undetectable AI is available on the web, as a browser extension, and through an API.
What does the Chrome extension do?
It offers AI detection, humanization, paraphrasing, question solving, and a human typing simulator. Named supported sites include Google Docs, LinkedIn, Gmail, Microsoft Word Online, Notion, ChatGPT, and Claude.
What can the API detect?
The API lists text, image, audio, and video detection, plus humanization and a writing-style replicator.
How much do the API plans cost?
API Starter is $29 a month and API Growth is $49 a month. Business uses custom pricing.
Is submitted text retained?
The detector FAQ says submitted text is never stored or used to train models.
Facts from Undetectable AI's own pages
- API capabilities
- The API page lists text detection, humanization, image, audio, and video detection, plus a writing-style replicator. · undetectable.ai, 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. · undetectable.ai, 3 Oct 2026
- Browser extension
- The free Chrome extension offers AI detection, humanization, paraphrasing, question solving, and a human typing simulator. · undetectable.ai, 3 Oct 2026
- Detection languages
- The detector page says it supports 50+ languages, with English offering the highest accuracy. · undetectable.ai, 3 Oct 2026
- Detector methods
- The site says its detector uses linguistic, semantic, and pattern-analysis models to identify AI-generated writing. · undetectable.ai, 3 Oct 2026
- Extension compatibility
- The extension page names Google Docs, LinkedIn, Gmail, Microsoft Word Online, Notion, ChatGPT, and Claude among supported sites. · undetectable.ai, 3 Oct 2026
- Free detector
- The site says its AI Detector is free, requires no signup, and returns instant results. · undetectable.ai, 3 Oct 2026
- Headquarters
- 1309 Coffeen Avenue, Sheridan, Wyoming, US 82801 · undetectable.ai, 28 Sept 2026
- Integrations
- The API page says Zapier can connect the service with Google Sheets, RSS feeds, email, and 7,000+ other integrations. · undetectable.ai, 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. · undetectable.ai, 3 Oct 2026
- Support
- The API Starter plan includes email support, while the Growth plan includes priority support. · undetectable.ai, 3 Oct 2026
- Text limit
- The detector input shows a limit of 10,000 words. · undetectable.ai, 3 Oct 2026
- Trial limit
- The pricing page says the free trial is limited to 250 words and additional use requires paid plan activation. · undetectable.ai, 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. · undetectable.ai, 3 Oct 2026
- Who it serves
- The detector page describes use by bloggers, SEO professionals, students, academics, writers, educators, and researchers. · undetectable.ai, 3 Oct 2026
Where Undetectable AI stands on Freedom251
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- AI Text Humanizers#21 of 25