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Instead of Readability Formulas
Readability Formulas alternatives
Readability Formulas is a free way to score English text and estimate the grade level and age a reader may need. It covers formulas including Flesch Reading Ease, Flesch-Kincaid, Gunning Fog, SMOG, Dale-Chall, Spache, FORCAST, Fry, and Raygor. Users can paste text or work with .txt, .docx, .rtf, .html, and .pdf files. Its beta Robert Gunning Editor helps find hard words and wordiness, and text statistics and beta batch processing support closer review. A Chrome and Edge extension can score selected website text, and the site says processing runs locally in the browser.
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ToolsVale Readability Checker
Free plan AndroidiPhoneLinux+3Free URL checks with crawler and paragraph analysis — ToolsVale adds URL analysis, crawler accessibility checks, paragraph heatmaps, and bulk comparisons rather than focusing on text files and English formulas.
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Readability
Free plan LinuxMacWindowsMarkdown projects with automated quality thresholds — Readability focuses on Markdown, multiple output formats, and CI threshold checks, unlike Readability Formulas' pasted text, document files, and browser extension.
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Eclipse Readability Studio
Free plan LinuxMacWindowsMultilingual document and batch analysis — Eclipse Readability Studio offers over 60 tests in English, Spanish, and German, grammar checking, and batch document analysis.
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A2Z Tools Plain Language Analyzer
Free plan WebPlain-language checks against audience targets — A2Z links plain-language findings to guidelines, supports custom jargon lists, and exports CSV, while Readability Formulas centers on formula scores.
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APIVerve Website Readability API
Free plan APIWebAutomated website readability scoring via API — APIVerve provides website readability scoring through an API endpoint, unlike Readability Formulas' interactive text and document tools.
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PageRefine
Free plan WebQuick browser-based website copy clarity checks — PageRefine focuses on website-copy clarity, a score, quick fixes, and simplified suggestions rather than a range of reading formulas.
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ProfText
Free plan APIWebDocument clarity, citation, and team risk reviews — ProfText adds vague-language and AI-pattern detection, citation verification, risk grading, rewrites, and team workflows beyond readability scoring.
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Avidemux
Free plan Open source LinuxMacWeb+1 - 9
AI Readability
Free plan Web - 10
AI Readability Checker
Free plan Web - 11
Hemingway Editor
Free plan MacWebWindows - 12
ApyHub Readability Scores Documents API
Free plan API - 13
Botoi Readability API
Free plan API - 14
eReadable
Free plan Web - 15
Etoolio Easy Read Checker
Free plan Web - 16
Oanor Readability API
Free plan API - 17
Readability Analysis Tool (RAT)
Free plan LinuxWindows - 18
Readable
Free plan APIWeb - 19
Text Inspector
Free plan APIWeb - 20
textstat
Free plan LinuxSelf-hosted - 21
Tensetti Plain Language Checker
Free plan Web - 22
WebFX Readability Test Tool
Free plan Web - 23
Health Literacy Advisor
Free trial AndroidiPhoneMac+26.3 Visit site - 24
VT Writer
Free trial LinuxSelf-hostedWeb+1
Its English-only focus and beta status for the editor and batch processing may not suit every workflow. Alternatives differ in whether they analyze URLs, check plain language or grammar, handle multiple languages, or fit into developer tools and automated checks. Before switching, consider the material you need to review, whether you want scores or actionable revisions, and which platforms and file formats fit your work. Some options focus on website copy or Markdown, while others add multilingual tests, API access, or team-oriented checks.
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