17.4
Text Inspector analyzes English text and reports difficulty, readability, lexical diversity, and CEFR levels.
Free planWebAPI
Best AI Readability Checkers in 2026
When you want writing to be easier to read, checkers can offer different kinds of assessment and guidance. ToolsVale Readability Checker, Readability Formulas and A2Z Tools Plain Language Analyzer are among the named options. Compare readability scores and grade-level analysis with sentence complexity, input formats, plain-language rewrites and accessibility guidance. These details can help you distinguish tools…
27.3
Free planOpen sourceWebLinuxmacOS
37.0
Health Literacy Advisor assesses and improves document readability using plain-language principles.
AndroidiOSWeb
- 4
Readable
Readable is an online toolkit for analyzing and improving writing readability and quality.
WebAPI7.0From $12 a month - 5
Hemingway Editor
Hemingway Editor helps writers assess readability by scoring text and highlighting sentences and issues that may make a message harder to understand.
WebmacOSWindows6.8 - 6
APIVerve Website Readability API
APIVerve Website Readability API analyzes a webpage and returns its readability score information, including eight scores and grade-level analysis.
Free planWebAPI6.7From $29.99 a month - 7
ToolsVale Readability Checker
ToolsVale Readability Checker evaluates pasted text or web pages for readability, crawler access, and paragraphs that may need revision.
Free planAndroidiOSWebLinux6.7Free plan - 8
ProfText
ProfText analyzes documents for vague language, patterns associated with AI-generated writing, and the validity of academic citations.
Free planWebAPI6.6From €9.99 a month - 9
ApyHub Readability Scores Documents API
ApyHub Readability Scores Documents API measures how easy a document or publicly accessible web page is to read.
Free planAPI6.5From $16 a month - 10
Botoi Readability API
Botoi Readability API analyzes English text and returns Flesch-Kincaid Grade, Flesch Reading Ease, Gunning Fog, and underlying counts.
Free planAPI6.5From $9 a month - 11
Tensetti Plain Language Checker
Tensetti Plain Language Checker is a web tool for spotting clarity issues in technical documents.
Free planWeb6.5From €120 a year - 12
Readability
Readability analyzes Markdown files and reports measures of reading difficulty.
Free planLinuxmacOSWindows6.4Free plan - 13
Oanor Readability API
Oanor Readability API scores text using six formulas: Flesch Reading Ease, Flesch-Kincaid Grade, Gunning Fog, SMOG, Coleman-Liau, and Automated Readability Index.
Free planAPI6.3From €6.80 a month - 14
Readability Formulas
Readability Formulas provides tools for scoring English text and estimating the grade level and age of readers likely to understand it.
Free planWebExtensionmacOSWindows6.3Free plan - 15
StyleWriter
StyleWriter is Windows proofreading and editing software that adjusts writing advice to a selected audience and task.
Windows6.2$90 one-time - 16
textstat
textstat is a free, open-source Python library for measuring readability, text complexity, and grade level.
Free planLinuxSelf-hosted6.2Free plan - 17
Eclipse Readability Studio
Eclipse Readability Studio is free, open-source desktop software for examining how easily documents can be read.
Free planLinuxmacOSWindows6.1Free plan - 186.1Free plan
- 19
Readability Analysis Tool (RAT)
Readability Analysis Tool (RAT) checks German text for readability anomalies using configurable rules, in a process likened to finding bug patterns…
Free planLinuxWindows6.1Free plan - 20
A2Z Tools Plain Language Analyzer
A2Z Tools Plain Language Analyzer checks English drafts against plain-language guidance and links findings to guideline sources.
Free planWeb6.0Free plan - 21
AI Readability
AI Readability is a free web checker for assessing how readily English text can be read by people and parsed or reused by AI systems.
Free planWeb5.9Free plan - 22
AI Readability Checker
AI Readability Checker is a free web tool for reviewing how easily AI assistants can extract content from a page or draft.
Free planWeb5.9Free plan - 23
eReadable
eReadable is a free web-based tool for checking readability and adapting text to a target reading level.
Free planWeb5.9Free plan - 24
WebFX Readability Test Tool
WebFX Readability Test Tool analyzes webpage text and reports six readability scores: Flesch Kincaid Reading Ease, Flesch Kincaid Grade Level,…
Free planWeb5.9Free plan - 25
Etoolio Easy Read Checker
Etoolio Easy Read Checker is a free web tool that scores text against Easy Read and plain-language principles.
Free planWeb5.8Free plan