Best AI Readability Checkers in 2026
Updated
In short: ToolsVale Readability Checker is ranked #1 of 25 as of 8 October 2026, ahead of Health Literacy Advisor and Hemingway Editor. 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.
When you need to make text clearer, readability checkers offer different measures and kinds of help. Compare readability scores and grade-level analysis with sentence complexity, and look for plain-language rewrites or accessibility guidance if those matter to your work. Input formats indicate what you can bring in for review; free-plan availability and paid-from pricing help you weigh cost. ToolsVale Readability Checker, Health Literacy Advisor, and Hemingway Editor are among the named options, alongside Text Inspector and eReadable. Consider which signals will help you judge your intended readers’ needs, and whether you want feedback only or suggestions for changing the text.
25 AI readability checkers ranked on what their makers publish — plans and prices, free tiers, platforms and the facts on their own pages.
25ranked
17free plans on this page
$0.69/molowest paid tier
8 Oct 2026last checked
Input list AI Readability Checkers 25 channels on this page · 91 of 200 spec lines stated by the makers
Ch Tool Free planPaid fromReadability scoresGrade-level analysisSentence complexityPlain-language rewritesAccessibility guidanceInput formats Spec sheet Score
01 ToolsVale Readability Checker Free planYesPaid fromnot statedReadability scores7 scoresGrade-level analysisYesSentence complexityYesPlain-language rewritesYesAccessibility guidancenot statedInput formatsnot stated 5/8spec lines stated 7.6
02 Health Literacy Advisor Free planNoPaid fromnot statedReadability scores9 scoresGrade-level analysisYesSentence complexityYesPlain-language rewritesYesAccessibility guidancenot statedInput formatsnot stated 5/8spec lines stated 7.4
03 Hemingway Editor Free planYesPaid fromnot statedReadability scoresnot statedGrade-level analysisnot statedSentence complexitynot statedPlain-language rewritesnot statedAccessibility guidancenot statedInput formatsnot stated 1/8spec lines stated 7.4
04 Readability Free plannot statedPaid fromnot statedReadability scoresnot statedGrade-level analysisYesSentence complexityYesPlain-language rewritesNoAccessibility guidanceNoInput formatsdocument 5/8spec lines stated 7.4
05 APIVerve Website Readability API Free planYesPaid from$29.99/moReadability scores8 scoresGrade-level analysisYesSentence complexitynot statedPlain-language rewritesnot statedAccessibility guidancenot statedInput formatswebpage 5/8spec lines stated 7.3
06 Text Inspector Free planYesPaid fromnot statedReadability scoresnot statedGrade-level analysisnot statedSentence complexitynot statedPlain-language rewritesnot statedAccessibility guidancenot statedInput formatsnot stated 1/8spec lines stated 7.2
07 Readability Formulas Free planYesPaid fromnot statedReadability scoresnot statedGrade-level analysisnot statedSentence complexitynot statedPlain-language rewritesnot statedAccessibility guidancenot statedInput formatsnot stated 1/8spec lines stated 7.0
08 PageRefine Free planYesPaid fromnot statedReadability scoresnot statedGrade-level analysisnot statedSentence complexityYesPlain-language rewritesYesAccessibility guidancenot statedInput formatstext 4/8spec lines stated 6.9
09 Tensetti Plain Language Checker Free planYesPaid fromnot statedReadability scores0 scoresGrade-level analysisNoSentence complexityYesPlain-language rewritesNoAccessibility guidancenot statedInput formatstext 6/8spec lines stated 6.9
10 VT Writer Free planNoPaid fromnot statedReadability scoresnot statedGrade-level analysisYesSentence complexityYesPlain-language rewritesYesAccessibility guidancenot statedInput formatsdocument 5/8spec lines stated 6.9
11 AI Readability Free planYesPaid fromnot statedReadability scoresnot statedGrade-level analysisnot statedSentence complexityYesPlain-language rewritesYesAccessibility guidancenot statedInput formatstext 4/8spec lines stated 6.8
12 AI Readability Checker Free planYesPaid fromnot statedReadability scoresnot statedGrade-level analysisnot statedSentence complexityYesPlain-language rewritesYesAccessibility guidancenot statedInput formatsnot stated 3/8spec lines stated 6.8
13 eReadable Free planYesPaid fromnot statedReadability scoresnot statedGrade-level analysisYesSentence complexityYesPlain-language rewritesYesAccessibility guidancenot statedInput formatstext 5/8spec lines stated 6.8
14 Etoolio Easy Read Checker Free planYesPaid fromnot statedReadability scoresnot statedGrade-level analysisYesSentence complexityYesPlain-language rewritesYesAccessibility guidanceYesInput formatstext 6/8spec lines stated 6.8
15 Readability Analysis Tool (RAT) Free planYesPaid fromnot statedReadability scoresnot statedGrade-level analysisnot statedSentence complexitynot statedPlain-language rewritesnot statedAccessibility guidancenot statedInput formatsnot stated 1/8spec lines stated 6.8
16 StyleWriter Free planNoPaid fromnot statedReadability scores9 scoresGrade-level analysisYesSentence complexityYesPlain-language rewritesNoAccessibility guidanceNoInput formatsdocument 7/8spec lines stated 6.8
17 A2Z Tools Plain Language Analyzer Free planYesPaid fromnot statedReadability scoresnot statedGrade-level analysisYesSentence complexityYesPlain-language rewritesYesAccessibility guidancenot statedInput formatstext 5/8spec lines stated 6.7
18 ApyHub Readability Scores Documents API Free planYesPaid from$16/moReadability scoresnot statedGrade-level analysisnot statedSentence complexitynot statedPlain-language rewritesnot statedAccessibility guidancenot statedInput formatsnot stated 2/8spec lines stated 6.7
19 Botoi Readability API Free planYesPaid from$9/moReadability scoresnot statedGrade-level analysisnot statedSentence complexitynot statedPlain-language rewritesnot statedAccessibility guidancenot statedInput formatsnot stated 2/8spec lines stated 6.7
20 Oanor Readability API Free planYesPaid fromnot statedReadability scores6 scoresGrade-level analysisYesSentence complexitynot statedPlain-language rewritesnot statedAccessibility guidancenot statedInput formatsapi 4/8spec lines stated 6.7
21 WebFX Readability Test Tool Free planYesPaid fromnot statedReadability scores6 scoresGrade-level analysisYesSentence complexityYesPlain-language rewritesnot statedAccessibility guidancenot statedInput formatstext 5/8spec lines stated 6.7
22 Readable Free planNoPaid from$12/moReadability scoresnot statedGrade-level analysisnot statedSentence complexitynot statedPlain-language rewritesnot statedAccessibility guidancenot statedInput formatsnot stated 2/8spec lines stated 6.6
23 textstat Free plannot statedPaid fromnot statedReadability scoresnot statedGrade-level analysisYesSentence complexitynot statedPlain-language rewritesNoAccessibility guidanceNoInput formatstext 4/8spec lines stated 6.2
24 Eclipse Readability Studio Free planYesPaid fromnot statedReadability scoresnot statedGrade-level analysisnot statedSentence complexitynot statedPlain-language rewritesnot statedAccessibility guidancenot statedInput formatsnot stated 1/8spec lines stated 5.6
25 ProfText Free planYesPaid fromnot statedReadability scoresnot statedGrade-level analysisnot statedSentence complexitynot statedPlain-language rewritesnot statedAccessibility guidancenot statedInput formatstext 2/8spec lines stated 5.6
Compare all 25 in a table
| # | Tool | Score | Free plan | From | Free plan | Paid from | Readability scores | Grade-level analysis |
|---|---|---|---|---|---|---|---|---|
| 1 | ToolsVale Readability Checker | 7.6 | Free plan | Free | Yes | — | 7 scores | Yes |
| 2 | Health Literacy Advisor | 7.4 | No | $41.58/mo | No | — | 9 scores | Yes |
| 3 | Hemingway Editor | 7.4 | No | $0.69/mo | Yes | — | — | — |
| 4 | Readability | 7.4 | Free plan | Free | — | — | — | Yes |
| 5 | APIVerve Website Readability API | 7.3 | Free plan | $29.99/mo | Yes | 29.99 /mo | 8 scores | Yes |
| 6 | Text Inspector | 7.2 | Free plan | Free | Yes | — | — | — |
| 7 | Readability Formulas | 7.0 | Free plan | Free | Yes | — | — | — |
| 8 | PageRefine | 6.9 | Free plan | Free | Yes | — | — | — |
| 9 | Tensetti Plain Language Checker | 6.9 | Free plan | €10/mo | Yes | — | 0 scores | No |
| 10 | VT Writer | 6.9 | No | — | No | — | — | Yes |
| 11 | AI Readability | 6.8 | Free plan | Free | Yes | — | — | — |
| 12 | AI Readability Checker | 6.8 | Free plan | Free | Yes | — | — | — |
| 13 | eReadable | 6.8 | Free plan | Free | Yes | — | — | Yes |
| 14 | Etoolio Easy Read Checker | 6.8 | Free plan | Free | Yes | — | — | Yes |
| 15 | Readability Analysis Tool (RAT) | 6.8 | Free plan | Free | Yes | — | — | — |
| 16 | StyleWriter | 6.8 | No | — | No | — | 9 scores | Yes |
| 17 | A2Z Tools Plain Language Analyzer | 6.7 | Free plan | Free | Yes | — | — | Yes |
| 18 | ApyHub Readability Scores Documents API | 6.7 | Free plan | $16/mo | Yes | 16 /mo | — | — |
| 19 | Botoi Readability API | 6.7 | Free plan | $9/mo | Yes | 9 /mo | — | — |
| 20 | Oanor Readability API | 6.7 | Free plan | €6.80/mo | Yes | — | 6 scores | Yes |
| 21 | WebFX Readability Test Tool | 6.7 | Free plan | Free | Yes | — | 6 scores | Yes |
| 22 | Readable | 6.6 | No | $12/mo | No | 12 /mo | — | — |
| 23 | textstat | 6.2 | No | — | — | — | — | Yes |
| 24 | Eclipse Readability Studio | 5.6 | No | — | Yes | — | — | — |
| 25 | ProfText | 5.6 | No | — | Yes | — | — | — |
Is your tool 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 Specifiction?
ToolsVale Readability Checker is ranked #1 of 25 with a score of 7.6. Health Literacy Advisor is second and Hemingway Editor third.
How many of these have a free plan?
17 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, the fullest spec sheet first: how deeply the product is documented, the platforms it runs on, a free tier or trial to test it, and its standing.