Best AI Readability Checkers in 2026
Updated
In short: Text Inspector is ranked #1 of 25 as of 5 October 2026, ahead of Readable and A2Z Tools Plain Language Analyzer. The best-ranked option with a free plan is A2Z Tools Plain Language Analyzer. The lowest first paid tier on this page is Hemingway Editor at $0.69/mo.
For writing meant to be clear to its readers, AI readability checkers can offer scores, analysis or editing guidance. Compared on readability scores, grade-level analysis and sentence complexity, the entries provide several ways to assess text. Input formats can shape what you can review; plain-language rewrites and accessibility guidance may be useful when you need more than a score. Free-plan availability and paid-from pricing add cost context. Text Inspector, Readable and A2Z Tools Plain Language Analyzer are among the options shown. Consider the kinds of text you work with and whether you need assessment, guidance for improving accessibility or rewrite suggestions, then compare those needs with the listed features and access details.
25 AI readability checkers ranked on what their makers publish — plans and prices, free tiers, platforms and the facts on their own pages.
AI Readability Checkers, one module each. A lit port is something its maker publishes; 2 of the 25 on this page have a public API.
- 01 Text Inspector API yesOSS not on recordFREE yesDOCS 7.3Free
- 02 Readable API yesOSS not on recordFREE not on recordDOCS 6.7$12/mo
- 03 A2Z Tools Plain Language Analyzer API not on recordOSS not on recordFREE yesDOCS 5.9Free
- 04 PageRefine API not on recordOSS not on recordFREE yesDOCS 5.9Free
- 05 ToolsVale Readability Checker API not on recordOSS not on recordFREE yesDOCS 5.9Free
- 06 AI Readability Checker API not on recordOSS not on recordFREE yesDOCS 5.8Free
- 07 eReadable API not on recordOSS not on recordFREE yesDOCS 5.8Free
- 08 Etoolio Easy Read Checker API not on recordOSS not on recordFREE yesDOCS 5.8Free
- 09 Readability Formulas API not on recordOSS not on recordFREE yesDOCS 5.8Free
- 10 WebFX Readability Test Tool API not on recordOSS not on recordFREE yesDOCS 5.8Free
- 11 Hemingway Editor API not on recordOSS not on recordFREE not on recordDOCS 5.6$0.69/mo
- 12 Health Literacy Advisor API not on recordOSS not on recordFREE not on recordDOCS 5.4$41.58/mo
- 13 textstat API not on recordOSS not on recordFREE not on recordDOCS 5.4
- 14 VT Writer API not on recordOSS not on recordFREE not on recordDOCS 5.3
- 15 APIVerve Website Readability API API not on recordOSS not on recordFREE not on recordDOCS 5.2
- 16 Tensetti Plain Language Checker API not on recordOSS not on recordFREE not on recordDOCS 5.2
- 17 Readability API not on recordOSS not on recordFREE not on recordDOCS 5.1
- 18 AI Readability API not on recordOSS not on recordFREE not on recordDOCS 5.0
- 19 ApyHub Readability Scores Documents API API not on recordOSS not on recordFREE not on recordDOCS 5.0
- 20 Oanor Readability API API not on recordOSS not on recordFREE not on recordDOCS 5.0
- 21 ProfText API not on recordOSS not on recordFREE not on recordDOCS 5.0
- 22 Readability Analysis Tool (RAT) API not on recordOSS not on recordFREE not on recordDOCS 5.0
- 23 StyleWriter API not on recordOSS not on recordFREE not on recordDOCS 5.0
- 24 Botoi Readability API API not on recordOSS not on recordFREE not on recordDOCS 4.9
- 25 Eclipse Readability Studio API not on recordOSS not on recordFREE not on recordDOCS 4.8
Compare all 25 in a table
| # | Platform | Score | Free plan | From | Free plan | Paid from | Readability scores | Grade-level analysis |
|---|---|---|---|---|---|---|---|---|
| 1 | Text Inspector | 7.3 | Free plan | Free | Yes | — | — | — |
| 2 | Readable | 6.7 | No | $12/mo | No | 12 /mo | — | — |
| 3 | A2Z Tools Plain Language Analyzer | 5.9 | Free plan | Free | Yes | — | — | Yes |
| 4 | PageRefine | 5.9 | Free plan | Free | Yes | — | — | — |
| 5 | ToolsVale Readability Checker | 5.9 | Free plan | Free | Yes | — | 7 scores | Yes |
| 6 | AI Readability Checker | 5.8 | Free plan | Free | Yes | — | — | — |
| 7 | eReadable | 5.8 | Free plan | Free | Yes | — | — | Yes |
| 8 | Etoolio Easy Read Checker | 5.8 | Free plan | Free | Yes | — | — | Yes |
| 9 | Readability Formulas | 5.8 | Free plan | Free | Yes | — | — | — |
| 10 | WebFX Readability Test Tool | 5.8 | Free plan | Free | Yes | — | 6 scores | Yes |
| 11 | Hemingway Editor | 5.6 | No | $0.69/mo | Yes | — | — | — |
| 12 | Health Literacy Advisor | 5.4 | No | $41.58/mo | No | — | 9 scores | Yes |
| 13 | textstat | 5.4 | No | — | — | — | — | Yes |
| 14 | VT Writer | 5.3 | No | — | No | — | — | Yes |
| 15 | APIVerve Website Readability API | 5.2 | No | — | Yes | 29.99 /mo | 8 scores | Yes |
| 16 | Tensetti Plain Language Checker | 5.2 | No | — | Yes | — | 0 scores | No |
| 17 | Readability | 5.1 | No | — | — | — | — | Yes |
| 18 | AI Readability | 5.0 | No | — | Yes | — | — | — |
| 19 | ApyHub Readability Scores Documents API | 5.0 | No | — | Yes | 16 /mo | — | — |
| 20 | Oanor Readability API | 5.0 | No | — | Yes | — | 6 scores | Yes |
| 21 | ProfText | 5.0 | No | — | Yes | — | — | — |
| 22 | Readability Analysis Tool (RAT) | 5.0 | No | — | Yes | — | — | — |
| 23 | StyleWriter | 5.0 | No | — | No | — | 9 scores | Yes |
| 24 | Botoi Readability API | 4.9 | No | — | Yes | 9 /mo | — | — |
| 25 | Eclipse Readability Studio | 4.8 | No | — | Yes | — | — | — |
Is your platform 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 Inferse?
Text Inspector is ranked #1 of 25 with a score of 7.3. Readable is second and A2Z Tools Plain Language Analyzer third.
How many of these have a free plan?
9 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 on what each maker publishes, open and connectable first: a public API, open-source code, the depth of its documentation and a free tier to try it on. Model lists are sorted by the figure in their title, exactly as each provider publishes it.