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Head-to-head · Readability Checkers

ProWritingAid vs Readability Formulas

  • Updated Oct 2026
  • Both researched from official sources
  • 4 checks side by side
Higher score ProWritingAid #4 in Readability Checkers 8.8/10 Free plan Free plan✓ 1 of 4 features Visit ProWritingAid
Readability Formulas #5 in Readability Checkers 8.6/10 Free plan Free plan✓ 3 of 4 features Visit site

ProWritingAid 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 scoreProWritingAid · 8.8/10
  • Free planboth
  • Most featuresReadability Formulas · 3 of 4

ProWritingAid scores higher on our rubric for readability checkers: 8.8 against 8.6 out of 10; our editors rank them #4 and #5.

ProWritingAid is the better fit for writers needing broad editing integrations. Readability Formulas is the better fit for mature multi-formula readability analysis.

  • ProWritingAid fits best

    Writers needing broad editing integrations

  • Readability Formulas fits best

    Mature multi-formula readability analysis

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Side by side

Feature ProWritingAid 8.8/10 Visit ↗ Readability Formulas 8.6/10 Visit ↗
At a glance
Editor score 8.8 8.6
Ranking #4 in Readability Checkers #5 in Readability Checkers
Best for Writers needing broad editing integrations Mature multi-formula readability analysis
Pricing model Free plan + paid Free plan + paid
Starting price $120/yr Free plan
Free plan ✓ ✓
Free trial — —
Deployment Cloud, Desktop, Browser extension Cloud, Desktop, Browser extension
Platforms Web, Windows, macOS, Chrome extension Web, Windows, macOS, Chrome extension
Support Email, Docs Community, Docs
Built for Solo, Small business, Mid-market Solo, Small business, Mid-market, Enterprise
Features ProWritingAid 1/4 · Readability Formulas 3/4
Sentence analysis Not checked yet ✓ (best)
Clarity recommendations Not checked yet ✓ (best)
Browser extension ✓ ✓
API access Not checked yet Not checked yet
Specs
Readability formulas Not checked yet Not checked yet
Language support Not checked yet English
Our review
Pros
  • 25+ reports cover readability, style, structure, and repetition
  • Integrates with Google Docs, Word, Scrivener, Pages, and browsers
  • Custom style guides, tone detection, and rephrasing support editing workflows
  • 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
  • Free plan limits documents to 500 words
  • Support is limited to English and its listed dialect settings
  • Premium costs $30 per user monthly when billed month to month
  • 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

ProWritingAid is a grammar, spelling, punctuation, style, and readability toolkit for creative writers, business professionals, and students. It works through a web editor, Windows and Mac desktop applications, supported writing apps, and…

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. ProWritingAidReadability Checkers 8.8Free plan
  2. Readability FormulasReadability Checkers 8.6Free plan

Strengths and trade-offs

  • ProWritingAid — where it wins

    • 25+ reports cover readability, style, structure, and repetition
    • Integrates with Google Docs, Word, Scrivener, Pages, and browsers
    • Custom style guides, tone detection, and rephrasing support editing workflows

    Where it doesn't

    • Free plan limits documents to 500 words
    • Support is limited to English and its listed dialect settings
    • Premium costs $30 per user monthly when billed month to month

  • 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.

More comparisons

All readability checkers comparisons → · Full ranking →

Reviewed by iTechGuides Editors · Editorial team · Updated Oct 2026

Last updated · How we research and update