AI Tools Directory

AI Detection & Plagiarism Checking: Discover and Compare the Best AI Tools

Detection is probabilistic and every profile states its caveats — filter the verified tools by plan and platform. 4 of 77 verified tools are listed below — compare them by pricing, free plans, API access and supported platforms. We never invent prices or rankings. For the in-depth comparison, read the AI Detection & Plagiarism Checking guide.

Not sure which kind of tool you need? Start with our AI tools guide, then read how to use AI tools safely before connecting one to work data.

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Answer four quick questions — what you want to do, who you are, your budget and must-have features — and we rank the verified directory with the reasons spelled out. Every match links to a tool profile with sources and a last-verified date. Nothing here is sponsored.

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How to choose an AI tool

Start from the job, not the brand: pick the two or three tasks you actually need, then check the free tier's real limits — many "free" plans cap daily usage or reserve their best features for paid tiers. If you connect the tool to work data, read the privacy notes first; if you build software, confirm API access and pricing separately from the subscription. Open-source tools can be self-hosted but shift setup and updates onto you. Every profile in this directory lists what we verified, what we could not, and when we last checked — start with our AI tools guide, learn how to use AI tools safely, or browse genuinely free AI tools.

AI Detection & Plagiarism Checking

Showing 4 of 77 tools

QuillBot

QuillBot (Learneo) · AI Writing & Content Creation · AI Learning & Tutoring · AI Detection & Plagiarism Checking

A suite of writing tools for paraphrasing, summarising, grammar checking and AI detection, popular with students.

Best for: Rewording drafts

Free plan + paid From $19.95/mo No API or open-source record Verified Oct 19, 2026

GPTZero

AI Detection & Plagiarism Checking

An AI detection service that estimates whether a piece of text was written by a person, by an AI model, or by a mix of both.

Best for: Teachers reviewing student essays as one input alongside conversation and drafts

Free plan + paid Pricing not verified API Verified Oct 13, 2026

CheckWise AI

CheckWise AI · AI Detection & Plagiarism Checking

An independent document-analysis service that runs an AI-writing check and a similarity (plagiarism) check on the same upload.

Best for: Checking an essay or thesis draft before submission

Free trial Pricing not verified No API or open-source record Verified Oct 19, 2026

Plan details are summaries verified on the date shown on each profile — always confirm current pricing on the official site before buying. Nothing here is sponsored.