Overview

Text Inspector is an English-text analysis service with browser tools and an API, aimed chiefly at language teachers, researchers and students. Its strength is the range of vocabulary and readability measures; its boundaries are equally clear: full support is for English, and the largest text limit is 13,000 words.

Key features

Text Inspector reports difficulty, readability, lexical diversity and CEFR levels. Its overall difficulty score draws on more than 200 metrics, and the service also offers three readability formulas, sentence analysis and clarity recommendations. That breadth can make it useful when a single readability score is too narrow, though the range is most valuable when users can interpret the measures in context.

The CEFR Level Checker assigns individual words a CEFR level and indicates their commonness and difficulty. For educators adapting teaching materials or assessing student work, that word-level view is more actionable than a general score alone. Other tools include Statistics and Readability, Lexical Diversity, Scorecard, Tagger, EVP, BNC, COCA, Academic Word List and Phrases, Knowledge-Based Vocabulary Lists, and Metadiscourse Markers. The API lets people and organisations add Text Inspector analysis and scoring to their own products.

English is the only fully supported language. Other languages may receive limited statistics or lexical-diversity information, so this is not the right service for comprehensive multilingual analysis. The largest stated text limit is 13,000 words on the Organisation subscription, a meaningful ceiling for users processing longer documents.

Pricing

The Free plan costs 0.00 USD per free and allows 250 words, with data automatically deleted after six hours. It suits brief samples, but the low cap rules it out for substantial text analysis.

Standard has custom pricing, billed £9.96 monthly / £59.76 yearly. It raises the limit to 10,000 words and includes data export, English Vocabulary Profile, Academic Word List and Scorecard, automatic deletion after six hours, and manual data clearing. It is the more suitable paid tier for an individual who needs those tools and a larger working document limit; users give up the Organisation plan's added seats and higher ceiling.

Organisation has custom pricing, billed £59.76 monthly / £358.56 yearly. It supports up to 10 people and 13,000 words, with the same listed export, vocabulary and scorecard features and data-clearing options as Standard. The extra cost is most defensible for a small team that needs shared capacity or the largest stated limit.

API access has custom pricing, billed from £360 per year, and includes full API access for use in your own applications. A 30-day period is available to test it free of charge. This is the relevant option for product integration rather than browser-only analysis. All three web plans automatically delete analysis data after six hours; the paid plans also allow manual clearing. Separately, analysis data is cleared from the website after six hours, and each analysis has a private URL deleted from the servers after that period.

Platforms

Text Inspector runs on the web and offers an API. The API broadens its use to organisations incorporating analysis into their own applications, while the web tools suit direct text review. The service fully supports English and may provide limited statistics or lexical-diversity information for other languages.

Who it's for

Text Inspector is best suited to language professionals, academics and students preparing teaching materials, tests or evaluations of student work. Its word-level CEFR information and vocabulary lists make it more relevant to language-focused analysis than to general-purpose writing assistance. Users working with lengthy documents should check the word limits against their workflow, and multilingual teams should look elsewhere for full language coverage.

Pros and cons

Pros: More than 200 metrics plus three readability formulas provide multiple angles on difficulty and readability.
Pros: Word-level CEFR, commonness and difficulty information supports vocabulary-focused teaching and assessment.
Pros: An API allows organisations to integrate analysis and scoring into their own products.
Cons: The Free plan's 250-word limit confines it to short passages.
Cons: English is the only fully supported language, limiting its fit for multilingual analysis.
Cons: The largest stated text limit is 13,000 words, which may not cover longer documents.

Alternatives

For a choice centered on readability tools, compare the Readability Checkers list; readers seeking AI-focused options can use AI Readability Checkers.

Choose Hemingway Editor instead if desktop support for macOS or Windows matters alongside web access; its listed annual individual plans allocate 5,000 or 10,000 AI sentences per month. Readability Formulas is a simpler alternative for free calculators and a Readability Scoring System, with web, extension, macOS and Windows platforms. TextGears may fit better when text translation, paraphrasing, custom dictionary rules or an option not to store texts matter. ProWritingAid is an extension-based option with a free tier capped at 500 words per report run and two report runs per day. Check Readability is worth considering for free web or extension access without an account or usage fees. Readability Analysis Tool (RAT) suits readers who want a free Windows or Linux project with .docx support and German readability rules. For API-only document scoring, ApyHub Readability Scores Documents API offers a free Starter tier with 3,000 atoms per month and one API key. Botoi Readability API is another free-tier API option, with 1,000 requests per day and access to more than 150 endpoints.

Verdict

Text Inspector is a strong fit for language professionals, academics and students who need English-focused readability measures alongside word-level CEFR and vocabulary analysis. Its broad toolkit and API are compelling reasons to choose it; its 250-word free cap, 13,000-word maximum and limited support for other languages are good reasons to look elsewhere.

	AI Readability	Text Inspector
Free plan	Yes	Yes
Free trial	No	Yes
Paid from	Free	Free
Open source	No	No
Platforms	Web	api, Web
Free plan	Yes	Yes
Sentence complexity	Yes	—
Plain-language rewrites	Yes	—
Input formats	text	—

AI Readability vs Text Inspector

AI Readability

Text Inspector