ATOS Analyzer vs TextGears

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.

TextGears checks writing for spelling, grammar, style, and readability, through its website and API. The API also provides autocorrection, text analysis, language detection, summarization, and keyword extraction, returning JSON through HTTP or HTTPS requests. Its documentation lists 11 languages, including English, French, German, Portuguese, Russian, Italian, Arabic, Spanish, Japanese, Chinese, and Greek, as well as dialect codes such as en-US, en-GB, and pt-BR. A Postman collection and JavaScript library link are available for integration. Free access includes 500 requests per month, 200k characters per month, and a 4k-character request limit. PRO costs $2.48 a month and includes unlimited checks, translations, and paraphrases of long texts, custom dictionary rules, and an option not to store texts. TextGears says AI does not support every language and recommends standard plans when language breadth matters more than AI analysis quality. Readability metrics are recommended for texts of at least 30 words. The maker is headquartered in Tallinn, Estonia.