AI Detectors.io

Overview

AI Detectors.io combines AI-written text analysis with a set of writing and verification tools. Its detector reports an overall AI probability, confidence scores, and sentence-level results for text associated with major language models. The company says it examines perplexity, burstiness, n-gram patterns, and stylometric fingerprints, and also lists paraphrase detection.

The wider service includes a humanizer, citation verification, plagiarism checking, grammar tools, and watermark removal. AI Detectors.io reports 95.2% accuracy and a 3.1% false-positive rate on a 500-text benchmark from April 2026. The benchmark is for English. The detector returns scores for other languages, but the company says those languages are outside its benchmark coverage, so its reported figures should not be taken as evidence of equivalent performance in them. An AI probability is an indicator, not proof of how a text was produced.

Key features

Detection and writing tools

Results include sentence-level analysis as well as an overall probability and confidence scores. The listed detection signals describe features of wording and style that the detector says it evaluates. Separate tools cover humanizing text, checking citations and plagiarism, grammar assistance, and watermark removal.

Ways to use the detector

The Chrome extension lets users select text on webpages and view sentence-level results. A Microsoft Word add-in supports Word 2016 and later on Windows and Mac, as well as Word for the web, and can produce PDF reports. The REST API returns an overall AI probability and can also provide sentence-level scores. The vendor lists the extension, Word plugin, and API as integrations; it says LMS integrations are not currently available.

Privacy and support

The privacy policy says submitted text may be processed by third-party AI and infrastructure providers and is retained only as long as needed to deliver and support the service. The company describes its technical and organizational safeguards as reasonable, while acknowledging that it cannot guarantee absolute security. Email support is available, and the help center says the team usually responds within one business day.

Pricing

AI Detectors.io has a free plan and paid plans. The listed free plan is free, billed at $0/month, and includes three bonus credits at signup, 10,000 words per month, one free credit daily, and a 500-word limit per use. It includes the Basic AI Detector but not Ultra mode or tone customization.

• Starter (API): free, billed Free. Includes 100 requests per month, up to 1,000 words per request, an overall AI probability score, community support, and an API key dashboard.
• Premium: $8.33 a year, billed $100/year. The listed offer is $9.99$8.33/mo, with 2 months free (17% off monthly). It includes 500,000 words per month, unlimited daily credits, up to 25,000 words per AI Detector scan, the Advanced AI Detector, Ultra mode, and tone customization.
• Developer (API): $29 a month, billed $29/month. Includes 5,000 requests per month, sentence-level scores, up to 5,000 words per request, and email support.
• Enterprise (API): Custom pricing, not listed. Includes unlimited requests, higher rate limits, everything in Developer, and priority support.

There is no free trial. The free plan provides a way to use the service without a subscription, while API plans distinguish request volumes and whether sentence-level scores are included.

Platforms

AI Detectors.io is listed for web, macOS, Windows, API, and extension use. Its Chrome extension works with selected webpage text, and the Word add-in supports desktop Word on Windows and Mac as well as Word for the web.

Who it's for

The company describes the service for students, teachers, writers, teams, educators, publishers, and editorial teams. Its combination of text checks and companion writing tools may suit people who want several functions together, while the extension, Word add-in, and API offer different ways to bring detection into existing workflows. Those relying on scores for languages other than English should account for the fact that the company’s benchmark does not cover them.

Pros and cons

• Pros: Sentence-level results and an overall AI probability; a broad set of accompanying writing and verification tools; a free plan; browser, Word, and API access.
• Cons: The company’s benchmark covers English only; no LMS integrations are listed; the free plan has a 500-word-per-use limit and excludes Ultra mode and tone customization.

Alternatives

Other options in the category include GPTZero, It's AI, Winston AI, Originality.ai, Pangram, Proofademic, TrustOriginality.ai, and ContentDetector.org. Browse the AI Content Detectors category for more options.

Verdict

AI Detectors.io brings AI text detection, sentence-level results, and several related writing checks into one service, with access through web, Chrome, Word, and API. Its free tier makes basic use accessible, while Premium raises the scan limit to 25,000 words and adds Ultra mode and tone customization. The main qualification is how to interpret its results: the published benchmark is limited to English, and a probability score should inform review rather than stand alone as a judgment about authorship.