Top-10 Resources for AI Text Simplifiers (Plain English)

CEFRlevels.com Text Analyzer

Description:

CEFRlevels.com Text Analyzer rates the difficulty of a pasted text against the Common European Framework and draws a vocabulary list from it. Published by CEFRlevels.com, the tool compares each word with a list of the ten thousand most common words in English and returns an approximate level, along with the words most likely to need explaining.

100% Free (unlimited): The analyzer runs in the browser with no account, no registration and no payment, and a text may be submitted as often as needed. The vocabulary list it produces, and the word meanings it links to, open on the same terms.

Access: 100% Free Level: All Levels Format: Interactive Tool Written for: General English (ESL) English Variant: US

How It Helps Your Business English

What this resource offers:

A single box takes a block of pasted text. On submitting it, the tool returns an approximate CEFR level for the passage and a suggested vocabulary list, with the option of a longer list. Notes below the box explain that each word is matched against the ten thousand most common English words, and that results are steadier above about fifty words.

How to use this resource:

You can test a document before you send it and see whether its level matches the reader you have in mind, then replace the words the list flags. Running your own writing through it shows which terms sit above the level of everyone who will read it. For something you are studying, the vocabulary list gives you the words to learn first, with meanings a click away.

Note:

ESLBusiness.com earns no commission if you upgrade to a paid plan.

Last verified — Oct. 26, 2026