Tested at approximately 94% accuracy against a human-annotated word set. No syllable counter is perfectly accurate due to English's irregular pronunciation — this is a known limitation shared by essentially all readability tools.
Free SEO Tool
Keyword Density & Readability Analyzer
Check how readable your content is with 5 established readability formulas, and see which words and phrases you're actually repeating — both instantly, entirely in your browser.
- ✔ 5 readability formulas
- ✔ 1/2/3-word phrase density
- ✔ Stopword filtering
- ✔ Free Forever
Write Content That's Both Readable and Focused
Search engines and readers both reward content that's clear and not stuffed with the same phrase repeated unnaturally. This tool runs five established readability formulas — Flesch Reading Ease, Flesch-Kincaid Grade Level, Gunning Fog, Coleman-Liau, and ARI — to estimate how easy your writing is to follow, and separately analyzes 1, 2, and 3-word phrase frequency so you can spot unintentional keyword stuffing or confirm your target phrase appears often enough without looking spammy.
How It Works
1. Paste Your Content
Any text — a blog post, product page, or article draft.
2. Check Readability
Get 5 formula scores plus a plain-English grade level.
3. Check Keyword Density
See your most-repeated words and phrases, with density %.
4. Revise
Adjust sentence length or phrase repetition and re-check.
Readability Reference
Understanding Flesch Reading Ease Scores
| Score | Level | Typical Reader |
|---|---|---|
| 90–100 | Very Easy | 5th grade — easily understood by an 11-year-old |
| 80–89 | Easy | 6th grade — conversational English |
| 70–79 | Fairly Easy | 7th grade |
| 60–69 | Standard | 8th–9th grade — plain English, ideal for most web content |
| 50–59 | Fairly Difficult | 10th–12th grade |
| 30–49 | Difficult | College level |
| 0–29 | Very Confusing | College graduate / academic |
Most web and marketing content performs best in the 60–70 range (Standard to Fairly Easy)
— plain, direct language that doesn't feel condescending but doesn't require advanced
vocabulary either.
FAQsKeyword Density & Readability Analyzer
How accurate is the syllable counting used for readability scores?
What keyword density should I aim for?
There's no official target — write naturally for the reader. If a phrase feels repetitive when read aloud, it's likely overused, regardless of the exact percentage.
Is my content uploaded anywhere?
No. All analysis happens entirely in your browser. Nothing is sent to any server.