ATOS Analyzer vs UsingEnglish Text Analyser

ATOS Analyzer is a free web tool for estimating the readability level of text and books in English or Spanish. Users can enter a passage, analyze an entire book, or submit a sample with an estimated word count. Text can be typed or uploaded as a .txt, .docx, or .epub file, with uploads limited to 10 MB. The suggested passage length is 150 to 25,000 characters. Results include an ATOS level, grade-level equivalent, word count, AR Points, average word length, average sentence length, and language. ATOS estimates complexity on a grade-level scale using sentence length, word length, and word difficulty; its measure also accounts for book length. For a sampled book, Renaissance recommends three passages of about 150 words from different parts and an estimated total word count. Scanned documents need OCR to become recognized text before submission; changing a file extension does not convert them. The page includes a CCSS/ATOS grade-band chart for grades 1 through 12. Renaissance presents the measure as guidance for matching students with appropriately leveled reading material.

UsingEnglish Text Analyser is a free web tool for examining text statistics, word patterns, and readability. The standard analyser counts words, different words, paragraphs, sentences, characters, and syllables, and reports hard-word and long-word measures plus the Gunning Fog Readability Index. It groups words by length with graphs and a frequency table, and produces a word cloud that scales terms by frequency while omitting very common words. The standard version handles up to 10,000 characters. The advanced analyser is also free, requires registration, accepts up to 100,000 characters, and can save up to 20 texts. Its tools include a sortable word-frequency list, word-length breakdown, graded text analysis, common-phrase analysis, and additional readability scores. Graded analysis compares vocabulary against the British National Corpus or General Service List, which can help when selecting vocabulary for learners. The standard analyser is described as suitable for students, translators, writers, and others who want to study text statistically.