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Undetectable AI

undetectable.ai

From $1.77/mo Free trial WebAPIBrowser extension
Visit undetectable.ai
Spec score 7.6 #34 of 45 in AI Content Detection Software

What it is

Undetectable AI’s AI Detector checks whether text may be AI-generated and identifies ChatGPT, Gemini, Claude, and other models as detectable sources. It says its analysis uses linguistic, semantic, and pattern signals, supports more than 50 languages, and offers highest accuracy in English. Input accepts up to 10,000 words. The detector page describes a free, no-signup checker with instant results, while the pricing page limits the free trial to 250 words and requires paid activation for additional use. The service is available on the web, as an extension, and through an API. The Chrome extension adds detection, humanization, paraphrasing, question solving, and a typing simulator, with named support for Google Docs, LinkedIn, Gmail, Microsoft Word Online, Notion, ChatGPT, and Claude. API features include text, image, audio, and video detection, humanization, and writing-style replication. Zapier connections include Google Sheets, RSS feeds, email, and 7,000+ integrations. Listed paid plans start at 9.99 /mo; API Starter costs $29 a month and API Growth $49 a month.

Spec sheet

What it does
The AI Detector checks whether text may be AI-generated and names ChatGPT, Gemini, Claude, and other models as detectable sources.Read 3 Oct 2026 · undetectable.ai
Integrations
The API page says Zapier can connect the service with Google Sheets, RSS feeds, email, and 7,000+ other integrations.Read 3 Oct 2026 · undetectable.ai
Support
The API Starter plan includes email support, while the Growth plan includes priority support.Read 3 Oct 2026 · undetectable.ai
Headquarters
1309 Coffeen Avenue, Sheridan, Wyoming, US 82801Read 28 Sep 2026 · undetectable.ai
API capabilities
The API page lists text detection, humanization, image, audio, and video detection, plus a writing-style replicator.Read 3 Oct 2026 · undetectable.ai
API limits
The API FAQ says the default rate limit is 3 requests per second per IP address, and higher limits can be requested.Read 3 Oct 2026 · undetectable.ai
Browser extension
The free Chrome extension offers AI detection, humanization, paraphrasing, question solving, and a human typing simulator.Read 3 Oct 2026 · undetectable.ai
Detection languages
The detector page says it supports 50+ languages, with English offering the highest accuracy.Read 3 Oct 2026 · undetectable.ai
Detector methods
The site says its detector uses linguistic, semantic, and pattern-analysis models to identify AI-generated writing.Read 3 Oct 2026 · undetectable.ai
Extension compatibility
The extension page names Google Docs, LinkedIn, Gmail, Microsoft Word Online, Notion, ChatGPT, and Claude among supported sites.Read 3 Oct 2026 · undetectable.ai
Free detector
The site says its AI Detector is free, requires no signup, and returns instant results.Read 3 Oct 2026 · undetectable.ai
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.Read 3 Oct 2026 · undetectable.ai
Text limit
The detector input shows a limit of 10,000 words.Read 3 Oct 2026 · undetectable.ai
Trial limit
The pricing page says the free trial is limited to 250 words and additional use requires paid plan activation.Read 3 Oct 2026 · undetectable.ai
Who it serves
The detector page describes use by bloggers, SEO professionals, students, academics, writers, educators, and researchers.Read 3 Oct 2026 · undetectable.ai

Plans and prices

50K words/month $21.25 a year $21.25/mo 50K words/month · Includes all features from other plans Read 3 Oct 2026 · undetectable.ai
API Starter $29 a month $29/mo 72,500 words included · $0.40 / 1K words after allowance · Standard rate limits · Email support Read 3 Oct 2026 · undetectable.ai
API Growth $49 a month $49/mo 245,000 words included · $0.20 / 1K words after allowance · Higher rate limits · Priority support Read 3 Oct 2026 · undetectable.ai
10K words/month $60 a year $5.00/mo; Charged annually $60.00 10K words/month · Unlimited AI Detecting · API compatible Read 3 Oct 2026 · undetectable.ai
20K words/month $114 a year $9.50/mo; Charged annually $114.00 20K words/month · Unlimited AI Detecting · API compatible Read 3 Oct 2026 · undetectable.ai
35K words/month $189 a year $15.75/mo; Charged annually $189.00 35K words/month · Unlimited AI Detecting · API compatible Read 3 Oct 2026 · undetectable.ai
Business Priced on request Custom pricing Non-expiring credits · Redistribution and white labeling · Priority support · API compatible Read 3 Oct 2026 · undetectable.ai

Every Undetectable AI plan and price →

Strong points and limits

Strong points

  • Supports more than 50 languages
  • 10,000-word detector input limit
  • Web, extension, and API access
  • Batch scanning and file uploads
  • Submitted text not stored, per FAQ

Limits

  • Free trial limited to 250 words
  • English is listed as highest accuracy
  • API default limit is 3 requests per second per IP
  • Paid plans start at 9.99 /mo

Who it suits

It suits bloggers, SEO professionals, students, academics, writers, educators, and researchers checking text across web, extension, or API workflows. API users should consider request limits and plan support levels.

Verdict

Undetectable AI combines multilingual detection with browser and API options, plus related rewriting tools. The short free-trial allowance, stated accuracy caveat, and API rate limit should shape plan decisions.

Where Specifiction places it

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