Best AI Readability Checkers in 2026
Updated
In short: ToolsVale Readability Checker is ranked #1 of 25 as of 8 October 2026, ahead of Readability and Readability Formulas. The best-ranked option with a free plan is Readability. The lowest first paid tier on this page is Hemingway Editor at $0.69/mo.
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.
25 AI readability checkers ranked on what their makers publish — plans and prices, free tiers, platforms and the facts on their own pages.
18 of the 25 here have a free tier you can use, 0 have open-source code on record, and 0 have full bars: free, open, on most of your devices and documented.
| # | App | Signal | Free tier | Open code | Devices | From | Score |
|---|---|---|---|---|---|---|---|
| 1 | ToolsVale Readability CheckerWeb · Windows · Mac · Linux · Android · iPhone | Three bars | — | 6 of 6 | Free | 6.7 | |
| 2 | ReadabilityWindows · Mac · Linux | Three bars | — | 3 of 6 | Free | 6.6 | |
| 3 | Readability FormulasWeb · Windows · Mac · Extension | Three bars | — | 3 of 6 | Free | 6.5 | |
| 4 | A2Z Tools Plain Language AnalyzerWeb | Two bars | — | 1 of 6 | Free | 6.4 | |
| 5 | APIVerve Website Readability APIWeb · API | Two bars | — | 1 of 6 | $29.99/mo | 6.4 | |
| 6 | PageRefineWeb | Two bars | — | 1 of 6 | Free | 6.4 | |
| 7 | Readability Analysis Tool (RAT)Windows · Linux | Two bars | — | 2 of 6 | Free | 6.4 | |
| 8 | Tensetti Plain Language CheckerWeb | Two bars | — | 1 of 6 | €10/mo | 6.4 | |
| 9 | Text InspectorWeb · API | Two bars | — | 1 of 6 | Free | 6.4 | |
| 10 | AI ReadabilityWeb | Two bars | — | 1 of 6 | Free | 6.3 | |
| 11 | AI Readability CheckerWeb | Two bars | — | 1 of 6 | Free | 6.3 | |
| 12 | ApyHub Readability Scores Documents APIAPI | Two bars | — | 0 of 6 | $16/mo | 6.3 | |
| 13 | Botoi Readability APIAPI | Two bars | — | 0 of 6 | $9/mo | 6.3 | |
| 14 | eReadableWeb | Two bars | — | 1 of 6 | Free | 6.3 | |
| 15 | Etoolio Easy Read CheckerWeb | Two bars | — | 1 of 6 | Free | 6.3 | |
| 16 | Oanor Readability APIAPI | Two bars | — | 0 of 6 | €6.80/mo | 6.3 | |
| 17 | WebFX Readability Test ToolWeb | Two bars | — | 1 of 6 | Free | 6.3 | |
| 18 | Hemingway EditorWeb · Windows · Mac | Two bars | — | — | 3 of 6 | $0.69/mo | 5.6 |
| 19 | Health Literacy AdvisorWeb · Windows · Mac · Android · iPhone | Two bars | — | — | 5 of 6 | $41.58/mo | 5.3 |
| 20 | textstatLinux | One bar | — | — | 1 of 6 | — | 5.3 |
| 21 | Eclipse Readability StudioWindows · Mac · Linux | Two bars | — | 3 of 6 | Free | 5.2 | |
| 22 | ProfTextWeb | No signal | — | — | 1 of 6 | — | 5.1 |
| 23 | VT WriterWeb · Windows · Linux · Self-hosted | Two bars | — | — | 3 of 6 | — | 5.1 |
| 24 | ReadableWeb · API | One bar | — | — | 1 of 6 | $12/mo | 5.0 |
| 25 | StyleWriterWindows | One bar | — | — | 1 of 6 | — | 5.0 |
Compare all 25 in a table
| # | App | Score | Free plan | From | Free plan | Paid from | Readability scores | Grade-level analysis |
|---|---|---|---|---|---|---|---|---|
| 1 | ToolsVale Readability Checker | 6.7 | Free plan | Free | Yes | — | 7 scores | Yes |
| 2 | Readability | 6.6 | Free plan | Free | — | — | — | Yes |
| 3 | Readability Formulas | 6.5 | Free plan | Free | Yes | — | — | — |
| 4 | A2Z Tools Plain Language Analyzer | 6.4 | Free plan | Free | Yes | — | — | Yes |
| 5 | APIVerve Website Readability API | 6.4 | Free plan | $29.99/mo | Yes | 29.99 /mo | 8 scores | Yes |
| 6 | PageRefine | 6.4 | Free plan | Free | Yes | — | — | — |
| 7 | Readability Analysis Tool (RAT) | 6.4 | Free plan | Free | Yes | — | — | — |
| 8 | Tensetti Plain Language Checker | 6.4 | Free plan | €10/mo | Yes | — | 0 scores | No |
| 9 | Text Inspector | 6.4 | Free plan | Free | Yes | — | — | — |
| 10 | AI Readability | 6.3 | Free plan | Free | Yes | — | — | — |
| 11 | AI Readability Checker | 6.3 | Free plan | Free | Yes | — | — | — |
| 12 | ApyHub Readability Scores Documents API | 6.3 | Free plan | $16/mo | Yes | 16 /mo | — | — |
| 13 | Botoi Readability API | 6.3 | Free plan | $9/mo | Yes | 9 /mo | — | — |
| 14 | eReadable | 6.3 | Free plan | Free | Yes | — | — | Yes |
| 15 | Etoolio Easy Read Checker | 6.3 | Free plan | Free | Yes | — | — | Yes |
| 16 | Oanor Readability API | 6.3 | Free plan | €6.80/mo | Yes | — | 6 scores | Yes |
| 17 | WebFX Readability Test Tool | 6.3 | Free plan | Free | Yes | — | 6 scores | Yes |
| 18 | Hemingway Editor | 5.6 | No | $0.69/mo | Yes | — | — | — |
| 19 | Health Literacy Advisor | 5.3 | No | $41.58/mo | No | — | 9 scores | Yes |
| 20 | textstat | 5.3 | No | — | — | — | — | Yes |
| 21 | Eclipse Readability Studio | 5.2 | Free plan | Free | Yes | — | — | — |
| 22 | ProfText | 5.1 | No | — | Yes | — | — | — |
| 23 | VT Writer | 5.1 | No | — | No | — | — | Yes |
| 24 | Readable | 5.0 | No | $12/mo | No | 12 /mo | — | — |
| 25 | StyleWriter | 5.0 | No | — | No | — | 9 scores | Yes |
Is your app on this list?
Numbered spots on this list can be sponsored, and a sponsored row is labelled as paid.
Questions about this list
Which AI readability checker is ranked first on Freedom251?
ToolsVale Readability Checker is ranked #1 of 25 with a score of 6.7. Readability is second and Readability Formulas third.
How many of these have a free plan?
18 of the 25 on this page publish a free plan on their own pricing pages.
Which is the cheapest paid option?
On this page, Hemingway Editor has the lowest first paid tier we found: $0.69/mo.
How is this list ranked?
Ranked free-and-open first: a usable free tier and open-source code, then the platforms it runs on and its documentation.