Free Tool
AI tools prefer content at Grade 8 or below. Paste your content, get a Flesch-Kincaid score, and see exactly which sentences and words to simplify.
What This Tool Checks
Calculates your content's Flesch-Kincaid grade score. Grade 8 or below is the target for AI-cited content.
Converts the grade level into a 0–100 readability score so you can track improvement across drafts.
Flags every sentence over 25 words. Long sentences contain multiple ideas that AI models cannot cleanly extract.
Detects words like 'utilize' and 'leverage' and suggests shorter, clearer replacements.
Why Reading Level Matters in 2026
When Google AI Overview or Perplexity generates an answer, it does not summarize your entire article. It extracts the specific sentence or paragraph that most directly answers the query.
That extraction process favors short sentences. If a sentence contains two ideas connected by a conjunction, the AI system either skips it or extracts it imprecisely. Either way, your content is less likely to be cited.
The Rule
One idea per sentence. One sentence under 25 words. Grade 8 or below. This is the reading level formula that AEO-optimized content follows in 2026.
Grade Scale
Accessible to all readers. Ideal for FAQ answers and product descriptions.
Target zone for AI-cited content. Clean extractions, high citability.
Borderline for AI retrieval. Restructure long sentences to improve.
Likely to be skipped by AI systems. Significant simplification needed.
Academic or legal complexity. AI systems will not cite this content reliably.
FAQ
AI retrieval systems like Google AI Overview, Perplexity, and ChatGPT prefer content written at or below an 8th grade reading level. Simpler sentences are easier to extract, parse, and cite accurately. Content written above Grade 10 is significantly less likely to appear in AI-generated answers.
The Flesch-Kincaid Grade Level formula calculates: Grade = 0.39 × (words per sentence) + 11.8 × (syllables per word) − 15.59. A lower score means the content is easier to read. Grade 8 means a typical 8th grader can understand it. Most successful AI-cited content scores between Grade 6 and Grade 8.
AI systems extract standalone paragraphs and sentences to answer user queries. Long sentences — those with more than 25 words — contain multiple ideas, which makes the extraction less clean. When an AI model cannot extract a clear, single-idea answer from your sentence, it skips to the next source.
Words like 'utilize', 'leverage', 'facilitate', and 'implement' are associated with AI-generated content patterns. AI systems are trained to cite content that sounds human, conversational, and direct. Replacing complex words with simpler alternatives improves both AI citability and human readability.
No. This tool runs entirely in your browser. Your text is never sent to any server, stored, or processed externally. The analysis happens client-side using JavaScript, so you can test confidential content safely.