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Head-to-head · Readability Checkers

Readability Formulas vs Slick Write

  • Updated Oct 2026
  • Both researched from official sources
  • 4 checks side by side
Higher score Readability Formulas #5 in Readability Checkers 8.6/10 Free plan Free plan✓ 3 of 4 features Visit site
Slick Write #7 in Readability Checkers 8.2/10 Free plan Free plan✓ 1 of 4 features Visit Slick Write

Readability Formulas leads on 0 checks, Slick Write 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 scoreReadability Formulas · 8.6/10
  • Free planboth
  • Most featuresReadability Formulas · 3 of 4

Readability Formulas scores higher on our rubric for readability checkers: 8.6 against 8.2 out of 10; our editors rank them #5 and #7.

Readability Formulas is the better fit for mature multi-formula readability analysis. Slick Write is the better fit for free readability and style checking in browsers.

  • Readability Formulas fits best

    Mature multi-formula readability analysis

  • Slick Write fits best

    Free readability and style checking in browsers

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Side by side

Feature Readability Formulas 8.6/10 Visit ↗ Slick Write 8.2/10 Visit ↗
At a glance
Editor score 8.6 8.2
Ranking #5 in Readability Checkers #7 in Readability Checkers
Best for Mature multi-formula readability analysis Free readability and style checking in browsers
Pricing model Free plan + paid Free
Starting price Free plan Free
Free plan ✓ ✓
Free trial — —
Deployment Cloud, Desktop, Browser extension Cloud, Browser extension
Platforms Web, Windows, macOS, Chrome extension Web, Chrome extension
Built for Solo, Small business, Mid-market, Enterprise Solo, Small business
Features Readability Formulas 3/4 · Slick Write 1/4
Sentence analysis ✓ (best) Not checked yet
Clarity recommendations ✓ (best) Not checked yet
Browser extension ✓ ✓
API access Not checked yet Not checked yet
Specs
Readability formulas Not checked yet Not checked yet
Language support English Not checked yet
Our review
Pros
  • Combines multiple readability formulas with consensus scoring.
  • Includes hard-word, wordiness, and detailed text statistics.
  • Supports batch processing, file imports, graphs, and browser scoring.
  • Free access to grammar, style, flow, and readability checks
  • Analyzes vocabulary variety, passive voice, repetition, and sentence structure
  • Chrome extension supports Google Docs, WordPress, selections, and text boxes
Cons
  • 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.
  • Browser-focused platform coverage limits where it can be used
  • Checks English writing rather than offering broad language coverage
  • Its wide set of analyses may require time to interpret effectively
Our verdict

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 →

Slick Write is a free, browser-based writing checker for bloggers, novelists, SEO professionals, students, and other writers working in English. It combines grammar error checking with stylistic issue detection, sentence structure…

Read the review →
  1. Readability FormulasReadability Checkers 8.6Free plan
  2. Slick WriteReadability Checkers 8.2Free plan

Strengths and trade-offs

  • 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.

  • Slick Write — where it wins

    • Free access to grammar, style, flow, and readability checks
    • Analyzes vocabulary variety, passive voice, repetition, and sentence structure
    • Chrome extension supports Google Docs, WordPress, selections, and text boxes

    Where it doesn't

    • Browser-focused platform coverage limits where it can be used
    • Checks English writing rather than offering broad language coverage
    • Its wide set of analyses may require time to interpret effectively
  • Readability Formulas8.6/10 · Free plan

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

    Visit siteFull verdict →
  • Slick Write8.2/10 · Free plan

    A free browser checker that combines grammar review with detailed style and readability analysis.

    Visit Slick WriteFull 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