AI Detectors.io

Overview

AI Detectors.io is an AI-text detector bundled with tools for rewriting, citation and plagiarism checks, grammar, and watermark removal. It suits people who want detection alongside those utilities, particularly when they work across a browser, Word, or an API. Its strongest stated benchmark is limited to English and 500 texts, so treat scores as indicators rather than proof of authorship.

Key features

Detection and writing tools

The detector gives an overall AI probability, confidence scores, and sentence-level analysis for text associated with major language models. It says it evaluates perplexity, burstiness, n-gram patterns, and stylometric fingerprints, and also offers paraphrase detection. Sentence-level results can help locate passages for closer review, but a score should not be used alone to make consequential judgments about a writer.

AI detection sits alongside a humanizer, citation verification, plagiarism checking, grammar tools, and watermark removal. That breadth is useful for writers and editorial teams who want several text-related utilities in one service; those seeking only a detector may have little reason to choose it over a narrower tool.

Benchmark and language coverage

The company reports 95.2% accuracy and a 3.1% false-positive rate on its April 2026 benchmark of 500 texts. The benchmark is for English. The detector returns scores for other languages, but the company says they are not covered by that evaluation, so the reported results do not establish performance in those languages.

API access

The REST API returns an overall AI probability and can provide sentence-level scores. The free Starter API tier allows 100 requests per month, up to 1,000 words per request, and community support; the paid Developer tier raises those limits and includes email support. This gives developers a way to integrate detection, though the free tier does not include sentence-level scores.

Pricing

AI Detectors.io is freemium, with no free trial. Its free plans are useful for occasional checks, but their quotas and scan limits make them a poor fit for sustained high-volume work.

• Free: 0.00 USD per month, billed $0/month and free forever. Includes 3 bonus credits at signup, 10,000 words per month, 1 free credit daily, and scans up to 500 words per use. It includes the Basic AI Detector, but excludes Ultra mode and tone customization.
• Starter (API): Free. Includes 100 requests per month, up to 1,000 words per request, an overall AI probability score, a key dashboard, and community support. It is a limited no-cost option for developers who do not need sentence-level results.
• Premium: 8.33 USD per year, billed $100/year and shown as $9.99$8.33/mo, with 2 months free (17% off monthly). Includes 500,000 words per month, unlimited daily credits, scans up to 25,000 words, Advanced AI Detector, Ultra mode, and tone customization. It fits regular individual use, though the displayed annual price and billing term are worth distinguishing.
• Developer (API): 29.00 USD per month, billed $29/month. Includes 5,000 requests per month, up to 5,000 words per request, sentence-level scores, and email support. This is the more capable API tier for ongoing integration needs.
• Enterprise (API): custom pricing. Includes unlimited requests, higher rate limits, everything in Developer, and priority support; it is aimed at organizations needing greater API capacity.

Platforms

The service is available on web, macOS, and Windows, as well as through an extension and API. The Chrome extension detects selected webpage text and displays sentence-level results. The Microsoft Word add-in supports Word 2016 and later on Windows and Mac, plus Word for the web, and can produce PDF reports. The company says it currently has no LMS integrations, which may matter to educators seeking a direct learning-platform workflow.

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

Who it's for

Students, teachers, writers, educators, publishers, editorial teams, and teams can use the detector and companion writing tools. Premium is the practical fit for recurring checks with larger documents; the free web plan is better for light use. Developers can start with the free API tier and move to Developer for sentence-level scores and higher request limits. Organizations needing higher API limits can consider Enterprise. Readers working primarily in languages other than English should not rely on the English benchmark as evidence of comparable performance.

Pros and cons

• Pro: Sentence-level results, confidence scores, and overall probability give reviewers more context than a single score.
• Pro: Humanizing, citation, plagiarism, grammar, and watermark tools extend the service beyond detection.
• Pro: Browser, Word, and API access accommodate different workflows, and Word reports can be exported as PDFs.
• Con: The published benchmark covers only 500 English texts, leaving performance in other languages unsubstantiated by those figures.
• Con: The free web plan caps scans at 500 words per use and excludes Ultra mode and tone customization.
• Con: There are no LMS integrations at the moment, limiting direct fit for educators who need that connection.

Alternatives

For a wider comparison, browse AI Content Detectors.

• ContentDetector.org is a free-plan alternative available on web, Windows, macOS, and iOS.
• GPTZero is another freemium option with a free trial, API, extension, and web access; its free plan includes 10,000 words per month and 50,000 characters.
• It's AI offers a free plan with 4,000 words, file upload, three deep scans, and a Chrome extension, plus API and web access.
• Originality.ai suits readers who want a free AI-detection-only plan with three scans per day, up to 2,000 words per scan, and DOCX, PDF, and DOC uploads.
• Pangram is a freemium alternative with a free trial, over 20 languages, file upload and OCR, and Google Docs integration.
• Proofademic has a free trial plan that includes multilingual detection, a plagiarism checker, and report export.
• TrustOriginality.ai offers a free web plan with one text analysis per month.
• Winston AI is a paid alternative with a free trial, API, extension, and web access.

Verdict

Choose AI Detectors.io if you want detection paired with writing and verification tools and need browser, Word, or API access. Its sentence-level output and broad toolset are practical strengths, but the English-only benchmark scope and limited free scan size make it a less convincing choice for multilingual judgments or heavy free use.