Best AI tools for detecting AI writing

3 AI text and plagiarism checkers, all with a free plan. Grammarly covers proofreading and rewrites for individuals and teams, Sapling offers grammar checks and AI detection through an API for developers and businesses, and Trinka focuses on academic and technical writing for students and researchers.

The ranked list

  1. 1

    Grammarlyalso does this

    Grammar and proofreading

    Grammar and proofreading

    Free plan

    Grammarly offers proofreading, paragraph rewrites and tone suggestions for individuals, teams and larger organizations, with a free plan.

  2. 2

    Saplingalso does this

    Checks grammar and suggests edits

    CopywritingAPIBrowser extensionPlugin or MCP

    Free plan

    Sapling provides an AI writing copilot and API with grammar checks, autocomplete and AI detection, for developers and businesses.

  3. 3

    Trinkaalso does this

    Checks grammar and paraphrases text

    Grading and feedbackWeb appBrowser extensionDesktop

    Free plan

    An academic and technical writing assistant that includes plagiarism and AI detection, aimed at students, researchers and publishers. Has a free Basic plan of 5,000 words per month and web, browser, desktop and plugin options.

List updated 16 Oct 2026