Best AI Text Detectors

Best Paid AI Text Detection Tools

GPTZero Pro

GPTZero Pro is a leading choice for educators, offering high-accuracy AI detection alongside tools built specifically for classroom use. It provides sentence-level insights, batch uploads, and teacher dashboards, helping instructors evaluate student submissions with transparency. Its scores based on “perplexity” and “burstiness” give a clear sense of how machine-written a passage may be, making it especially effective for academic environments.

Originality.AI

Originality.AI combines AI content detection with traditional plagiarism scanning, giving publishers and agencies a dual-layer approach to content integrity. Its clear, percentage-based reports and team collaboration features make it ideal for SEO professionals, freelance platforms, and content marketing agencies. With affordable usage-based pricing, it scales well for teams needing fast, ongoing checks.

Copyleaks AI Detector

Copyleaks delivers enterprise-grade AI detection, breaking down results sentence-by-sentence to catch mixed authorship in documents. Its support for over 30 languages and LMS integrations makes it a favorite among universities, publishers, and government institutions. Advanced users will appreciate its API access, robust reporting, and compatibility with learning systems like Moodle and Canvas.

Crossplag

Crossplag is a multilingual AI detection tool designed for higher education. It offers straightforward analysis with clear confidence scores and side-by-side comparison views. With free and paid tiers, it’s great for instructors reviewing student essays or institutions piloting AI ethics policies. Its clean interface and multilingual capabilities give it an edge in global academic settings.

Content at Scale

Content at Scale is built with web publishers and SEO writers in mind. It quickly evaluates long-form content, such as blog posts, to detect if it was AI-generated—even when human-edited. Though it’s part of a broader content automation suite, its standalone AI detector is intuitive, fast, and a great investment for content managers wanting originality assurance.

Best Free AI Text Detection Tools

GPTZero (Free)

GPTZero’s free version remains one of the most reliable AI detection tools for everyday use. It doesn’t require sign-up and offers unlimited checks with easy-to-understand output, including color-coded sentence evaluation. Whether you’re a teacher, student, or curious writer, it’s an accessible first line of defense against unintentional AI usage.

Writer AI Detector

Writer’s free AI detection tool provides quick, streamlined results for up to ~1500 words per scan. With no login needed and a simple interface, it’s excellent for checking social posts, email drafts, or website content. While it lacks deep reporting, it’s a handy utility for casual checks or initial screening before deeper review.

Sapling AI Detector

Sapling offers a one-click AI detection tool that delivers a confidence score indicating how likely the input was AI-generated. While it doesn’t provide breakdowns or heatmaps, its simplicity makes it ideal for quick spot-checks during editing or revision. It’s often used by bloggers, writers, and freelancers for lightweight verification.

Crossplag (Free)

Crossplag’s free version allows users to scan text for signs of AI authorship after creating a free account. It supports multiple languages and presents detection results with a confidence score. Perfect for students, instructors, or small institutions who want academic-grade detection without a paid subscription.

AI Text Detector (Hugging Face)

This open-source AI Text Detector by SzegedAI is a Hugging Face Space demo built on ModernBERT that helps predict whether input text is human-written or AI-generated :contentReference[oaicite:1]{index=1}. It provides real-time probability scores and a clear user interface. While it's not accurate enough for high-stakes decisions, it's ideal for developers, educators, and researchers who want to study detection models, test different inputs, or learn how classifiers perform. As an experimental, free-access tool, it doubles as an educational asset and a lightweight demo for anyone building or exploring AI detection workflows.