Check Readability vs Text Inspector

Check Readability analyzes pasted text and returns nine readability scores alongside a consensus grade level. The formulas include Automated Readability Index, Flesch Reading Ease, Gunning Fog, Flesch-Kincaid Grade Level, Coleman-Liau, SMOG, LINSEAR Write, FORCAST and New Dale-Chall. The web analyzer gives feedback on complexity, sentence length and word choice. A Chrome extension adds a native Side Panel, full-page or selected-text extraction and interactive formula breakdowns; scoring happens locally without transmitting page content or selected text. Text submitted to the website is sent over an encrypted connection and kept in memory only while scores are calculated. The site says analyzed text is not logged or stored, while Google Analytics is used for page visits and browser-related information. Check Readability is free, requires no account and permits personal and commercial use. The product says readable content can support accessibility and search rankings. Its scores are statistical estimates and cannot determine whether writing is accurate, logical, appropriate or well argued. The extension supports System, Light and Dark interface modes.

Text Inspector analyses English text for difficulty, readability, lexical diversity, and CEFR levels. Its overall difficulty score draws on more than 200 metrics, while the CEFR Level Checker gives individual words a level along with their commonness and difficulty. Listed tools include Statistics and Readability, Lexical Diversity, Scorecard, Tagger, EVP, BNC, COCA, Academic Word List and Phrases, Knowledge-Based Vocabulary Lists, and Metadiscourse Markers. An API lets people and organisations add analysis and scoring to their own products. The maker describes it as useful to language professionals, academics, and students preparing teaching materials or tests and evaluating student work. English is fully supported; other languages may receive limited statistics or lexical-diversity information. The Free plan covers 250 words and automatically deletes analysis data after six hours. The Organisation plan allows up to 13,000 words, the largest stated limit. A 30-day trial is listed for API access, which starts from £360 per year.