Analyzer · 100% free, no signup · Updated May 2026
Flesch-Kincaid score + Hemingway-style suggestions.
A free readability checker for blog posts, articles, and long-form content. Calculates Flesch-Kincaid grade level, syllable density, sentence length, and passive voice usage. Recommends edits to reach an 8th-grade reading level (the median internet-content target).
Paste any text. The checker outputs Flesch-Kincaid grade level, reading ease, average sentence length, and flags for: passive voice, long sentences (>25 words), and adverb density.
Paste text
Flesch-Kincaid grade level
5.1
Reading ease: 77/100 — aim for 60+. Lower grade = wider readership.
Sentences
4
Words
41
Avg sentence
10.3
Syllables
58
Style flags
- Sentences over 25 words0
- Passive voice0
- Adverbs (0.0% of words)0
Who this is for
Writers and content marketers who want grade-school-level prose without paying for Grammarly Premium.
The problem this solves
Long sentences + passive voice kill engagement. Most "AI writing tools" optimize for word count, not clarity. The checker uses the same rules Hemingway Editor charges $20 for — free, no signup.
Online content written at an 8th-grade reading level achieves approximately 25-40% higher completion rates than content written at college-level — yet 53% of B2B content scores at 12th-grade level or higher.
Source: Nielsen Norman Group Reading Behavior Studies 2024 + Hemingway App Public Dataset
How to use it
- 01
Paste text
Blog post, email, social post — any length.
- 02
See scores
Flesch-Kincaid grade + reading ease (0-100).
- 03
Sentence-level flags
Long sentences highlighted in yellow, passive voice in red.
- 04
Adverb count
Total adverb density — Hemingway recommends <2% of words.
What you get
- ✓ Flesch-Kincaid grade level
- ✓ Reading ease 0-100
- ✓ Sentence complexity flags
- ✓ Passive voice + adverb counts
Frequently asked
What's a good readability score?
8th-9th grade Flesch-Kincaid for most online audiences. B2B technical: 10-11th grade. Consumer/creator content: 6-8th grade.
Should I always aim for the lowest grade level?
Not always. Some technical audiences expect domain vocabulary. Forcing "simple" for an engineering audience reads as condescending.
How is passive voice harmful?
Passive voice ("the post was written by me") feels weaker and slower than active ("I wrote the post"). Cap at 10% of sentences max.
What's the ideal sentence length?
15-20 words average. Mix short (5-10) for punch and longer (20-25) for nuance. Sentences over 30 words signal complexity.
Does Google care about readability?
Indirectly. Readability correlates with dwell-time and completion-rate, which Google reads as quality signals. So yes — readability improvements compound to better SEO over time.
Related tools
Author + maintainer
Adrian Berisha — Founder of Clipflow. Indie SaaS builder shipping creator tools full-time since 2024. All tools and benchmarks on this page are reviewed quarterly. Last review: May 2026.
@clipflow on X · LinkedIn · hi@clipflow.to
Want this baked into your workflow?
Clipflow runs the whole repurposing pipeline — clip-finder, brand-voice captions, scheduler, multi-platform publish — for free on the Starter plan.
Try Clipflow free