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Head-to-head · Readability Checkers

Check Readability vs Readability Formulas

  • Updated Oct 2026
  • Both researched from official sources
  • 4 checks side by side
Higher score Check Readability #3 in Readability Checkers 9.0/10 Free plan Free plan✓ 3 of 4 features Visit site
Readability Formulas #5 in Readability Checkers 8.6/10 Free plan Free plan✓ 3 of 4 features Visit site

Check Readability leads on 0 checks, Readability Formulas on 0, and 4 are even. Who comes out ahead on the 4 yes/no, price and count checks where we have data for both products. The editor score weighs everything else too.

Our verdict

  • Highest scoreCheck Readability · 9.0/10
  • Free planboth

Check Readability scores higher on our rubric for readability checkers: 9.0 against 8.6 out of 10; our editors rank them #3 and #5.

Check Readability is the better fit for free browser-based readability checking. Readability Formulas is the better fit for mature multi-formula readability analysis.

  • Check Readability fits best

    Free browser-based readability checking

  • Readability Formulas fits best

    Mature multi-formula readability analysis

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Side by side

Feature Check Readability 9.0/10 Visit ↗ Readability Formulas 8.6/10 Visit ↗
At a glance
Editor score 9.0 8.6
Ranking #3 in Readability Checkers #5 in Readability Checkers
Best for Free browser-based readability checking Mature multi-formula readability analysis
Pricing model Free Free plan + paid
Starting price Free Free plan
Free plan ✓ ✓
Free trial — —
Deployment Cloud, Browser extension Cloud, Desktop, Browser extension
Platforms Web, Chrome extension Web, Windows, macOS, Chrome extension
Support Email Community, Docs
Built for Solo, Small business Solo, Small business, Mid-market, Enterprise
Features Check Readability 3/4 · Readability Formulas 3/4
Sentence analysis ✓ ✓
Clarity recommendations ✓ ✓
Browser extension ✓ ✓
API access Not checked yet Not checked yet
Specs
Readability formulas 9 formulas Not checked yet
Language support English English
Our review
Pros
  • Nine readability formulas plus a consensus grade level
  • Actionable guidance on sentence length, complexity, and word choice
  • Chrome extension analyzes selected text and full webpages
  • Combines multiple readability formulas with consensus scoring.
  • Includes hard-word, wordiness, and detailed text statistics.
  • Supports batch processing, file imports, graphs, and browser scoring.
Cons
  • English-language analysis only
  • Chrome extension is specific to the Chrome browser
  • Focused on readability metrics rather than broader editing tools
  • Language support is focused on English.
  • The product centers on analysis rather than broader writing workflows.
  • Readability Calculations and Readability PLUS are separate software offerings.
Our verdict

Check Readability is a free web-based checker for content creators, copywriters, SEO specialists, educators, legal professionals, editors, and researchers. Users can type or paste text into its web editor and receive results from nine…

Read the review →

Readability Formulas is a readability analysis toolkit for writers, editors, educators, marketers, healthcare providers, and government agencies. It evaluates text difficulty, reading grade level, sentence length, word usage, and…

Read the review →
  1. Check ReadabilityReadability Checkers 9.0Free plan
  2. Readability FormulasReadability Checkers 8.6Free plan

Strengths and trade-offs

  • Check Readability — where it wins

    • Nine readability formulas plus a consensus grade level
    • Actionable guidance on sentence length, complexity, and word choice
    • Chrome extension analyzes selected text and full webpages

    Where it doesn't

    • English-language analysis only
    • Chrome extension is specific to the Chrome browser
    • Focused on readability metrics rather than broader editing tools

  • Readability Formulas — where it wins

    • Combines multiple readability formulas with consensus scoring.
    • Includes hard-word, wordiness, and detailed text statistics.
    • Supports batch processing, file imports, graphs, and browser scoring.

    Where it doesn't

    • Language support is focused on English.
    • The product centers on analysis rather than broader writing workflows.
    • Readability Calculations and Readability PLUS are separate software offerings.
  • Check Readability9.0/10 · Free plan

    A free browser checker combining nine formulas with practical clarity guidance.

    Visit siteFull verdict →
  • Readability Formulas8.6/10 · Free plan

    A mature readability toolkit for writers, editors, educators, and content teams.

    Visit siteFull verdict →

More comparisons

All readability checkers comparisons → · Full ranking →

Reviewed by iTechGuides Editors · Editorial team · Updated Oct 2026

Last updated · How we research and update