Free AI-text readability score — quick heuristic signals (perplexity, burstiness, readability) for any text.
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The QuickToolz AI Output Detector & Readability Score gives you fast heuristic signals about a piece of writing — Flesch reading ease, Flesch-Kincaid grade level, average sentence length, burstiness, and lexical diversity. These are the same building blocks that AI-detection tools use as inputs.
⚠️ No detector is 100% reliable. This tool is for editorial insight and writing improvement — not for academic enforcement or accusations. Real detectors have ~30–50% false-positive rates on well-edited human text.
Flesch reading ease: 0–100 (higher = easier)
Flesch-Kincaid grade: US school grade level
Average sentence length: tells you cadence
Burstiness: variance in sentence length — AI tends to be flatter
Lexical diversity: unique words / total words
Everything you need, nothing you don’t. Built for speed and simplicity.
Flesch, Flesch-Kincaid, burstiness, diversity, and more.
Each score explained, not just a number.
Text never leaves your browser.
Everything you need, nothing you don’t. Built for speed and simplicity.
Drop in 200+ words for meaningful signal.
Got questions? We’ve got answers. Common questions about AI Output Detector Readability Score.
Five heuristic metrics with interpretation.
Vary sentence length, simplify, recheck scores.
AI output detector readability score
What it means
Higher readability is easier to scan. Higher AI-likeness is only a rough heuristic based on sentence length, repetition, and fluency — not proof of authorship.
Important
This tool does not detect AI with certainty. It helps you review readability, phrasing, and pattern uniformity — useful for editorial QA, not for courtroom-grade detection.