Free and open first
Best AI Readability Checkers in 2026
Clear writing depends on the audience and the kind of feedback you need. AI readability checkers can assess text through scores, grade-level analysis and measures of sentence complexity. Compared on input formats, plain-language rewrites and accessibility guidance, the entries also let you consider what text you can check and what support is listed. Review free-plan availability and paid-from pricing when weighing cost. ToolsVale Readability Checker, Readability Formulas and A2Z Tools Plain Language Analyzer are among the options. Match the listed analysis and guidance to the writing you want to make easier to understand.
- 26 apps
- Research read 23 Sept 2026
- How the order is worked out
- 1
Avidemux
Free plan Open source LinuxMacWeb+1 - 2
A2Z Tools Plain Language Analyzer
Free plan WebThe analyzer offers specific checks and audience settings for English plain-language review, with CSV export and browser-based text processing.
- 3
APIVerve Website Readability API
Free plan APIWebThe API combines webpage readability scoring with several response formats and workflow integrations. Check the credit allowance and plan terms against your expected volume and use.
- 4
Eclipse Readability Studio
Free plan LinuxMacWindowsEclipse Readability Studio combines readability testing, explanations, improvement suggestions, and grammar checking.
- 5
AI Readability
Free plan WebAI Readability provides a browser-based English text score and a brief rewrite suggestion, with pasted text kept out of the server-based check.
- 6
AI Readability Checker
Free plan WebAI Readability Checker offers structural checks and suggested edits for existing pages and drafts.
- 7
Hemingway Editor
Free plan MacWebWindowsHemingway Editor offers readability feedback, with Editor Plus adding AI editing and document review.
- 8
Readability Formulas
Free plan ExtensionMacWeb+1Readability Formulas offers scoring, editing, statistics, and batch tools for English text, including a browser extension.
- 9
ApyHub Readability Scores Documents API
Free plan APIApyHub’s API returns readability measures and supporting text statistics, with file and public-page inputs.
- 10
Botoi Readability API
Free plan APIBotoi provides a focused API for English readability analysis, with multiple scoring methods and examples for common integration languages.
- 11
Readability
Free plan LinuxMacWindowsChoose Readability if you want a free, open-source way to measure text complexity and enforce thresholds in documentation workflows.
- 12
eReadable
Free plan WebeReadable combines readability checks with rewriting tools for sentence-level edits and target reading levels.
- 13
Etoolio Easy Read Checker
Free plan WebEtoolio Easy Read Checker offers a focused wording review with several specific readability checks and an optional rewrite.
- 14
ProfText
Free plan APIWebProfText offers basic browser-based analysis for free and adds citation, rewrite, compliance, and team features across paid plans.
- 15
ToolsVale Readability Checker
Free plan AndroidiPhoneLinux+3This free checker combines text scoring, paragraph review, and crawler-access checks without requiring an account.
- 16
Oanor Readability API
Free plan APIOanor Readability API combines six readability scores with grade-level, reading-time and syllable analysis.
- 17
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.
- 18
PageRefine
Free plan WebPageRefine focuses on assessing and simplifying website text in short sections. Its score, issue labels, and copyable rewrite are available without signup on the free plan.
- 19
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.
- 20
Text Inspector
Free plan APIWebText Inspector offers a wide set of English-text measures, individual-word CEFR checks, and API access.
- 21
textstat
Free plan LinuxSelf-hostedChoose textstat if you need a free Python library for readability scores, grade-level estimates, and text statistics.
- 22
Tensetti Plain Language Checker
Free plan WebTensetti Plain Language Checker flags clarity issues and provides editing actions, but leaves revisions and safety judgments to the reader.
- 23
WebFX Readability Test Tool
Free plan WebThe tool offers several ways to submit text and provides both scores and sentence-level highlights. For dynamic or gated pages, pasting the text is the suggested alternative to URL analysis.
- 24
Health Literacy Advisor
Free trial AndroidiPhoneMac+2Health Literacy Advisor combines readability formulas, word-level suggestions, highlighting, and broader document assessment.
6.3 Visit site - 25
VT Writer
Free trial LinuxSelf-hostedWeb+1VT Writer focuses on document quality checks, while the wider VisibleThread platform covers additional RFP and contract workflows.
#1Places #1, #2, #3, #4, #5 on this list can be bought by the makers of the software on it. See the price
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