ReadabilityTool

Web

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Freedom report

One barScore 5.1

Free tierA free tier is on its own pricing page
Open codeNo open-source code on record
Runs widely1 of 6 device platforms
DocumentedThinly documented

ReadabilityTool is ranked #21 of 25 in readability checkers on Freedom251. It runs on Web. There is a free plan.

ReadabilityTool plans and pricing

All plans

Free Free No account · no limits on text analyzed · all six formulas readabilitytool.com · 5 Oct 2026

Compared on readability checkers

Free plan: Yes
Readability formulas: 6 formulas
Sentence analysis: Yes
Clarity recommendations: Yes

Best ReadabilityTool alternatives

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The record

Purpose: ReadabilityTool analyzes pasted text and reports readability scores, text statistics, and plain-language observations about complexity.
Six formulas: It provides Flesch Reading Ease, Flesch-Kincaid Grade Level, Gunning Fog, SMOG, Coleman-Liau, and Automated Readability Index scores.
Text breakdown: Results include word count, sentence count, average sentence length, and estimated reading time.
Complexity feedback: The Breakdown panel gives observations about sentence length and vocabulary complexity.
Browser processing: The site says text is processed in the browser using JavaScript and is never sent to a server, stored, or shared with third parties.
No account required: The tool requires no account and no software installation.
Free use: The site says all six formulas are available at no cost, with no subscription and no limit on how much text users can analyze.
Intended users: The site describes use by bloggers and content writers, students and educators, healthcare professionals, legal and business writers, SEO and marketing professionals, and technical writers.
SMOG limitation: The site says the SMOG Index requires at least 30 sentences for accuracy.
Healthcare guidance: The healthcare page says patient-facing materials should target Grade 6 or below and identifies SMOG as a health communications formula.
SEO guidance: The SEO page recommends Flesch Reading Ease scores of 60–70 and Flesch-Kincaid Grade Levels of 7–9 for blog posts and articles.
Price from: Free

Where it ranks on Freedom251

Best Readability Checkers in 2026#21 of 25

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Sources

readabilitytool.com/about/· checked 5 Oct 2026
readabilitytool.com/healthcare/· checked 5 Oct 2026
readabilitytool.com/seo/· checked 5 Oct 2026