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Best Readability Checkers in 2026
When you want to assess how easy a piece of writing is to follow, readability checkers offer different forms of analysis and feedback. Compare readability formulas and sentence analysis, then look at whether clarity recommendations support the kind of revision you have in mind. Language support matters if you review writing in multiple languages, while a browser extension may affect how you access checks as you work. Readability Formulas, ProWritingAid, and TextGears are among the entries to compare. API access may be useful for programmatic workflows; also weigh free-plan availability and paid-from pricing against the features you need.
- 25 apps
- Research read 23 Sept 2026
- How the order is worked out
- 1
Analyze My Writing
Free plan WebAnalyze My Writing offers a broad set of text and readability measures at no charge. Keep its text-length limits and age requirement in mind before using it.
- 2
Eclipse Readability Studio
Free plan LinuxMacWindowsEclipse Readability Studio combines readability testing, explanations, improvement suggestions, and grammar checking.
- 3
AnchorKite Readability Checker
Free plan WebAnchorKite Readability Checker provides several reading-level estimates and basic text statistics without requiring an account.
- 4
ApyHub Readability Scores Documents API
Free plan APIApyHub’s API returns readability measures and supporting text statistics, with file and public-page inputs.
- 5
ATOS Analyzer
Free plan WebATOS Analyzer provides several ways to assess passages and books, with grade-level results and guidance for sample-based analysis.
- 6
Check Readability
Free plan ExtensionWebCheck Readability provides several ways to estimate text difficulty, through its website and Chrome extension.
- 7
Hemingway Editor
Free plan MacWebWindowsHemingway Editor offers readability feedback, with Editor Plus adding AI editing and document review.
- 8
Botoi Readability API
Free plan APIBotoi provides a focused API for English readability analysis, with multiple scoring methods and examples for common integration languages.
- 9
Data·yze Readability Analyzer
Free plan WebData·yze Readability Analyzer offers several readability estimates, paragraph-level statistics, and text input by typing or upload.
- 10
Readability Formulas
Free plan ExtensionMacWeb+1Readability Formulas offers scoring, editing, statistics, and batch tools for English text, including a browser extension.
- 11
Delimiter Readability Checker
Free plan WebDelimiter Readability Checker offers local, account-free scoring for English prose. Treat its results as measures of sentence and word length, not a complete assessment of writing quality.
- 12
DO101 Readability Checker
Free plan WebChoose DO101 Readability Checker to review six readability measures and sentence patterns in English text, with processing done in the browser on your device.
- 13
- 14
Flesch-Kincaid Calculator
Free plan WebChoose Flesch-Kincaid Calculator if you need free browser-based readability scores, basic text metrics, and audience-focused recommendations without signing up.
- 15
Flesch-Kincaid Readability & Grade Level Analyzer
Free plan WebThe calculator provides quick reading scores and count details, but those scores cover sentence and syllable mechanics rather than overall clarity.
- 16
Readability Analysis Tool (RAT)
Free plan LinuxWindowsChoose RAT if you need configurable German readability checks for .docx files and can run command-line Java software.
- 17
ProWritingAid
by ProWritingAidFree plan ExtensionProWritingAid combines writing suggestions with reports, integrations, and plagiarism checking. Check the free limits and refund terms against your writing needs before choosing a plan.
- 18
Readable
Free plan APIWebReadable combines broad text analysis with editing suggestions and multiple ways to submit content. Its listed ContentPro plan starts at $12 a month, with API access reserved for AgencyPro.
- 19
Readability.ch
Free plan WebReadability.ch combines several readability scores with basic text statistics and sentence coloring, and offers browser-based analysis that can continue offline after loading.
- 20
ReadabilityTool
Free plan WebReadabilityTool provides six scores and text breakdowns without an account, subscription, or analysis limit. Keep the SMOG sentence minimum in mind when interpreting that score.
- 21
Slick Write
Free plan ExtensionWebSlick Write offers grammar and style checks alongside tools for examining sentence structure, quotations, and vocabulary.
- 22
Text Inspector
Free plan APIWebText Inspector offers a wide set of English-text measures, individual-word CEFR checks, and API access.
- 23
UsingEnglish Text Analyser
Free plan WebUsingEnglish Text Analyser provides a broad set of free statistics and readability measures, with expanded analysis available after registration.
- 24
Orwellix
Free trial ExtensionWebOrwellix combines document editing, analysis and AI modes with a separate free browser extension. Review the credit and character allowances, annual billing and trial conditions before subscribing.
- 25
StyleWriter
Free trial WindowsStyleWriter combines manuscript editing, grammar checks, readability reporting, and customizable proofreading in a Windows desktop application.
#1Places #1, #2, #3, #4, #5 on this list can be bought by the makers of the software on it. See the price