The Best AI Readability Checkers in 2026
We researched AI readability checkers through official pricing pages, plan tables, and product documentation. Products were ranked on their core readability-improvement job, value for money, and verified features such as reading-level analysis, sentence clarity guidance, plain-language rewrites, and accessibility support.
Our top picks
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Top ranked
Hemingway Editor#1 of 269.4/10A strong free editor with AI rewriting, readability scoring, and offline desktop access.
Free plan · 14-day trial
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Runner-up
eReadable#2 of 269.2/10A focused free checker for readability scores, plain-language issues, and targeted rewrites.
Free plan
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Top-ranked free plan
ToolsVale Readability Checker#3 of 269.0/10A free web and URL checker combining readability scores with AI citation readiness.
Free plan
Advertiser disclosure: iTechGuides is reader-supported. Vendors can pay for top positions in our rankings and for a place on other products' pages, and we may earn a commission when you click some links. Bought places stand at the number bought; this page and our disclosure say so. Paying vendors may get a fuller, more detailed review from our editors, and that review can change their score. How we rank.
The full ranking 26 tools, best first
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Best forWriters wanting free AI-assisted editing
A strong free editor with AI rewriting, readability scoring, and offline desktop access.
Free plan · 14-day trial Our Hemingway Editor verdict → Try Hemingway EditorFor vendors Sponsor this spot · #1 · $149/mo →9.4/10★★★★★Try Hemingway Editor -
Best forFree plain-language and readability checking
A focused free checker for readability scores, plain-language issues, and targeted rewrites.
- Plain-language rewrites
- Grade-level analysis
- Sentence complexity
9.2/10★★★★★Visit eReadable -
Best forFree web and URL readability analysis
A free web and URL checker combining readability scores with AI citation readiness.
- Plain-language rewrites
- Grade-level analysis
- Sentence complexity
9.0/10★★★★☆Visit ToolsVale -
Best forTeams needing deep reports and API access
A detailed English readability suite for teams that need reports and API access.
8.9/10★★★★☆Visit Readable -
Best forEstablished multi-format readability scoring
A broad English readability toolkit with free multi-formula scoring and document analysis.
8.7/10★★★★☆Visit site -
Best forOpen-source multilingual document analysis
A free, open-source desktop tool for multilingual document readability analysis.
8.6/10★★★★☆Visit Eclipse -
Best forEasy Read checks with optional AI rewriting
A focused free checker for readability issues, accessibility wording, and optional AI rewrites.
- Accessibility guidance
- Plain-language rewrites
- Grade-level analysis
8.5/10★★★★☆Visit Etoolio -
Best forFree structural and AI-readiness feedback
A free local checker for structural clarity, entity consistency, and answer readiness.
- Plain-language rewrites
- Sentence complexity
8.4/10★★★★☆Visit AI Readability -
Best forWeb content extractability and readability checks
A focused checker for seeing whether web content is easy for AI assistants to extract.
- Plain-language rewrites
- Sentence complexity
8.3/10★★★★☆Visit site -
Best forHealth and medical plain-language teams
A focused readability suite for teams improving health content across languages and platforms.
- Plain-language rewrites
- Grade-level analysis
- Sentence complexity
8.2/10★★★★☆Visit site -
Best forDevelopers analyzing webpages by API
A developer-focused API for structured webpage readability analysis.
- Grade-level analysis
8.1/10★★★★☆Visit APIVerve -
Best forResearchers needing linguistic text analysis
A focused English text analysis tool with readability, vocabulary and API capabilities.
8.0/10★★★★☆Visit Text Inspector -
Best forDevelopers enforcing readability in CI
A focused Markdown checker for teams enforcing readability thresholds in document pipelines.
- Grade-level analysis
- Sentence complexity
7.9/10★★★★☆Visit Readability -
Best forFree basic multi-formula web checking
A useful free checker for formula-based readability reviews and basic sentence flags.
- Grade-level analysis
- Sentence complexity
7.8/10★★★★☆Visit WebFX -
Best forDeterministic plain-language rule checking
A focused, deterministic checker for technical clarity—not a scoring or rewriting tool.
- Sentence complexity
7.7/10★★★★☆Visit Tensetti -
Best forSimple website-copy clarity checks
A free, focused way to spot unclear website copy and simplify it.
- Plain-language rewrites
- Sentence complexity
7.6/10★★★★☆Visit PageRefine -
Best forWindows editors using Microsoft Word
A Windows Word editor with deep readability, style, and word-choice analysis.
- Grade-level analysis
- Sentence complexity
7.5/10★★★★☆Visit StyleWriter -
Best forOrganizations needing Word and enterprise AI options
A focused choice for Word-based readability analysis with enterprise AI deployment options.
- Plain-language rewrites
- Grade-level analysis
- Sentence complexity
7.4/10★★★★☆Visit VisibleThread -
Best forPrivacy-focused plain-language editing
A free browser tool for finding jargon, complexity, and common readability barriers.
- Plain-language rewrites
- Grade-level analysis
- Sentence complexity
7.1/10★★★★☆Visit A2Z Tools -
Best forTeams combining clarity with compliance review
A broad clarity and compliance checker with free analysis and paid review controls.
7.0/10★★★★☆Visit ProfText -
Best forLow-cost developers needing formula APIs
A low-cost readability API for developers who need formula-based text analysis.
- Grade-level analysis
6.9/10★★★☆☆Visit Oanor -
Best forDevelopers needing a simple free API
A simple English readability API with three formulas, statistics, and JSON responses.
6.8/10★★★☆☆Visit Botoi -
Best forAPIs for uploaded office documents
A focused readability API with document uploads, URL scoring, and English or German analysis.
6.7/10★★★☆☆Visit ApyHub -
Best forDevelopers needing a readability library
A formula-rich open-source library for developers building readability analysis into Python workflows.
- Grade-level analysis
6.5/10★★★☆☆Visit textstat -
Best forVideo editors, not readability work
A free, open-source video tool—not a fit for AI readability analysis.
6.0/10★★★☆☆Visit Avidemux -
Best forOpen-source DOCX quality gates
A local DOCX quality gate for teams that need configurable readability checks.
5.3/10★★★☆☆Visit RAT
No tools match those filters.
Compare at a glance
| # | Tool | Free plan | Paid from | Grade-level analysis | Sentence complexity | Plain-language rewrites | Score |
|---|---|---|---|---|---|---|---|
| 1 | Hemingway Editor | Yes | $8.33/mo | 9.4 | |||
| 2 | eReadable | Yes | Free | Yes | Yes | Yes | 9.2 |
| 3 | ToolsVale Readability Checker | Yes | Free | Yes | Yes | Yes | 9.0 |
| 4 | Readable | No | $12/mo | 8.9 | |||
| 5 | Readability Formulas | Yes | 8.7 | ||||
| 6 | Eclipse Readability Studio | Yes | Free | 8.6 | |||
| 7 | Etoolio Easy Read Checker | Yes | Free | Yes | Yes | Yes | 8.5 |
| 8 | AI Readability | Yes | Free | Yes | Yes | 8.4 | |
| 9 | AI Readability Checker | Yes | Free | Yes | Yes | 8.3 | |
| 10 | Health Literacy Advisor | No | Yes | Yes | Yes | 8.2 | |
| 11 | APIVerve Website Readability API | Yes | $29.99/mo | Yes | 8.1 | ||
| 12 | Text Inspector | Yes | 8.0 | ||||
| 13 | Readability | Free | Yes | Yes | No | 7.9 | |
| 14 | WebFX Readability Test Tool | Yes | Free | Yes | Yes | 7.8 | |
| 15 | Tensetti Plain Language Checker | Yes | Free | No | Yes | No | 7.7 |
| 16 | PageRefine | Yes | Free | Yes | Yes | 7.6 | |
| 17 | StyleWriter | No | $50/yr | Yes | Yes | No | 7.5 |
| 18 | VT Writer | No | Yes | Yes | Yes | 7.4 | |
| 19 | A2Z Tools Plain Language Analyzer | Yes | Free | Yes | Yes | Yes | 7.1 |
| 20 | ProfText | Yes | €9.99/mo | 7.0 | |||
| 21 | Oanor Readability API | Yes | €6.80/mo | Yes | 6.9 | ||
| 22 | Botoi Readability API | Yes | $9/mo | 6.8 | |||
| 23 | ApyHub Readability Scores Documents API | Yes | $16/mo | 6.7 | |||
| 24 | textstat | Free | Yes | No | 6.5 | ||
| 25 | Avidemux | Yes | Free | 6.0 | |||
| 26 | Readability Analysis Tool (RAT) | Yes | Free | 5.3 |
Head-to-head All 24 comparisons →
- Hemingway Editor vs eReadable
- Hemingway Editor vs ToolsVale Readability Checker
- Hemingway Editor vs Readable
- Hemingway Editor vs Readability Formulas
- Hemingway Editor vs Etoolio Easy Read Checker
- Hemingway Editor vs AI Readability
- eReadable vs ToolsVale Readability Checker
- eReadable vs Readable
- eReadable vs Readability Formulas
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How we rank AI readability checkers
Every tool on this page was researched by iTechGuides Editors from its official website — pricing pages, plan tables and product documentation. We rank on how well each one does this category's core job, what the free or entry plan includes, and where it falls short. Where we have enough verified facts, the score out of 10 is a rubric — job fit, value and how much we could verify — shown with its breakdown on every tool's page; a tool we have not verified enough to score yet shows its rank without a number. Scores are re-checked when a product changes its plans. Read the full editorial policy, or submit a tool we missed.
Reviewed by iTechGuides Editors · Editorial team · Updated Oct 2026
Last updated · How we research and update