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Head-to-head · Readability Checkers

Readability Formulas vs Text Inspector

  • Updated Oct 2026
  • Both researched from official sources
  • 5 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
Text Inspector #6 in Readability Checkers 8.4/10 Free plan · 30-day trial Free planFree trial✓ 3 of 4 features Visit Text Inspector

Readability Formulas leads on 0 checks, Text Inspector on 0, and 5 are even. Who comes out ahead on the 5 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
  • Free trialonly Text Inspector

Readability Formulas scores higher on our rubric for readability checkers: 8.6 against 8.4 out of 10; our editors rank them #5 and #6.

Readability Formulas is the better fit for mature multi-formula readability analysis. Text Inspector is the better fit for english analysis with vocabulary depth and API access.

  • Readability Formulas fits best

    Mature multi-formula readability analysis

  • Text Inspector fits best

    English analysis with vocabulary depth and API access

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Side by side

Feature Readability Formulas 8.6/10 Visit ↗ Text Inspector 8.4/10 Visit ↗
At a glance
Editor score 8.6 8.4
Ranking #5 in Readability Checkers #6 in Readability Checkers
Best for Mature multi-formula readability analysis English analysis with vocabulary depth and API access
Pricing model Free plan + paid Free plan + paid
Starting price Free plan —
Free plan ✓ ✓
Free trial — 30 days
Deployment Cloud, Desktop, Browser extension Cloud
Platforms Web, Windows, macOS, Chrome extension Web
Support Community, Docs Email, Docs
Built for Solo, Small business, Mid-market, Enterprise Solo, Small business, Mid-market
Features Readability Formulas 3/4 · Text Inspector 3/4
Sentence analysis ✓ ✓
Clarity recommendations ✓ ✓
Browser extension ✓ (best) Not checked yet
API access Not checked yet ✓ (best)
Specs
Readability formulas Not checked yet 3 formulas
Language support English English
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.
  • Combines three named readability formulas with sentence statistics
  • Adds CEFR, lexical diversity, corpus and vocabulary analysis
  • Offers API access for integrating text analysis into applications
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.
  • Analysis is limited to English text
  • The Free plan has a 250-word limit
  • Export and advanced vocabulary tools require paid plans
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 →

Text Inspector is a web-based English text analysis tool for language educators, exam boards, researchers, material developers and organisations. It evaluates text difficulty, CEFR levels, vocabulary, lexical diversity and readability. Its…

Read the review →
  1. Readability FormulasReadability Checkers 8.6Free plan
  2. Text InspectorReadability Checkers 8.4Free plan · 30-day trial

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.

  • Text Inspector — where it wins

    • Combines three named readability formulas with sentence statistics
    • Adds CEFR, lexical diversity, corpus and vocabulary analysis
    • Offers API access for integrating text analysis into applications

    Where it doesn't

    • Analysis is limited to English text
    • The Free plan has a 250-word limit
    • Export and advanced vocabulary tools require paid plans
  • Readability Formulas8.6/10 · Free plan

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

    Visit siteFull verdict →
  • Text Inspector8.4/10 · Free plan · 30-day trial

    A focused English analysis tool with deep vocabulary measures and API access.

    Visit Text InspectorFull 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