Scribbr's AI detector is built for academic writing, and many students run their papers through it before submitting. Instead of a single AI-or-human verdict, it labels each part of a paper as human-written, AI-generated or AI-refined. Scribbr isn't part of the HumanizerEval benchmark yet; see the leaderboard for how popular humanizers, including StealthGPT, perform against leading detectors.
The detector
Scribbr is an academic services company known for human proofreading, its citation generator and a plagiarism checker used by students working on theses and dissertations. Its free AI detector needs no account and allows unlimited checks of up to 1,200 words each, with paragraph-level feedback that separates fully AI-generated text from AI-refined passages such as paraphrased or polished writing. A premium version is tuned for newer models. It analyzes English, German, French and Spanish, and Scribbr itself cautions that no AI detector is fully accurate.
Benchmark
HumanizerEval puts popular AI humanizers, including StealthGPT, through the same texts and leading AI detectors, and publishes every score. Scribbr isn't in the panel yet. Check the leaderboard to compare how each tool performs.
Scribbr’s documentation describes categories for AI-generated text, AI-generated text refined with AI, human-written text refined with AI, and human-written text. These labels organize the report around different writing processes. Keep the category and the associated passage together in your notes when discussing a draft with an editor or supervisor.
Scribbr: AI report categories and plagiarism-checking distinction
Scribbr distinguishes its AI detector’s analysis of writing patterns from its plagiarism checker’s comparison against existing sources. For an academic paper, those are separate review tasks. Organize source matches with your quotation and citation notes, while keeping the AI report alongside the document version it describes.
Scribbr: AI report categories and plagiarism-checking distinction
Scribbr describes separate categories for AI-generated text subsequently refined with AI and human-written text subsequently refined with AI. The category identifies the writing process its analysis assigns to the passage.
Scribbr: AI report categories and plagiarism-checking distinction
No. Scribbr describes AI analysis as examining writing patterns, while plagiarism checking compares text with existing sources. Keep the reports available for their respective review tasks.
Scribbr: AI report categories and plagiarism-checking distinction
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StealthGPT is built to make AI-written text read as human across leading AI detectors, including Scribbr's academic AI checker. Scribbr isn't part of HumanizerEval's benchmark yet, so we don't publish a bypass rate for it. See the HumanizerEval leaderboard for how popular humanizers, including StealthGPT, perform against leading detectors.
Scribbr's AI detector measures characteristics of a text such as sentence structure, length, word choice and predictability, rather than comparing it to a database the way a plagiarism checker does. It reports a percentage from 0% to 100% and labels each section as human-written, AI-generated or AI-refined.
StealthGPT's AI humanizer rewrites AI generated content to introduce the structural variation, lexical diversity, and natural unpredictability that distinguish human writing from AI output. StealthGPT's AI humanizer is trained to target the specific signals each major detector uses and is continually updated as those detectors evolve.
StealthGPT is tested monthly in HumanizerEval, its open benchmark. Scribbr isn't in HumanizerEval's detector panel yet; when it's added, this page will show StealthGPT's result.
See the HumanizerEval leaderboard for how StealthGPT and other popular humanizers perform against leading AI detectors, with every score published.
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