Instead of ATOS Analyzer
ATOS Analyzer alternatives
ATOS Analyzer helps educators judge whether a passage or book suits a student’s reading range. It estimates text complexity from sentence length, word length and difficulty, and includes book length when evaluating a whole book. Users can analyze a passage, an entire book or a sample with an estimated word count. Results include an ATOS level, grade equivalent, AR Points and text statistics. The free web tool accepts English and Spanish text, typed in or uploaded as .txt, .docx or .epub files up to 10 MB.
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Readability Formulas
Free plan ExtensionMacWeb+1Writers comparing English readability formulas and editing text — Readability Formulas adds many English scoring formulas, editing tools, batch processing and a browser extension, while ATOS centers on instructional reading levels.
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Eclipse Readability Studio
Free plan LinuxMacWindowsUsers needing desktop document batches and multiple language tests — Eclipse offers over 60 tests, grammar checking and batch document analysis across desktop platforms, unlike ATOS’s web-based instructional book focus.
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ProWritingAid
by ProWritingAidFree plan ExtensionWriters seeking style suggestions alongside grammar feedback — ProWritingAid adds style suggestions and grammar checking through extensions and a desktop app, while ATOS reports reading levels and book measures.
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Readability Analysis Tool (RAT)
Free plan LinuxWindowsGerman .docx authors finding readability anomalies — RAT flags German readability anomalies as document comments and creates HTML reports, unlike ATOS’s English and Spanish reading-level analysis.
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Analyze My Writing
Free plan WebFree web analysis of readability and text statistics — Analyze My Writing adds lexical density, passive-voice indicators, word clouds and cloze tests alongside multiple readability measures.
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AnchorKite Readability Checker
Free plan WebPrivate, offline browser-based readability estimates — AnchorKite reports six classic scores locally in the browser and can work offline, while ATOS provides instructional book measures.
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ApyHub Readability Scores Documents API
Free plan API - 9
Check Readability
Free plan ExtensionWeb - 10
Hemingway Editor
Free plan MacWebWindows - 11
Botoi Readability API
Free plan API - 12
Data·yze Readability Analyzer
Free plan Web - 13
Delimiter Readability Checker
Free plan Web - 14
DO101 Readability Checker
Free plan Web - 15
Flesch-Kincaid Calculator
Free plan Web - 16
Flesch-Kincaid Readability & Grade Level Analyzer
Free plan Web - 17
Readable
Free plan APIWeb - 18
Readability.ch
Free plan Web - 19
ReadabilityTool
Free plan Web - 20
Slick Write
Free plan ExtensionWeb - 21
Text Inspector
Free plan APIWeb - 22
UsingEnglish Text Analyser
Free plan Web - 23
Orwellix
Free trial ExtensionWeb - 24
StyleWriter
Free trial Windows
Its focus on instructional reading may be narrower than readers need: a passage is limited to 25,000 characters, scanned pages require OCR, and the tool is web-only. Alternatives offer different formulas, editing feedback, document-batch analysis or browser extensions. Before switching, weigh whether ATOS levels and book-sample estimates matter more than broader writing analysis, additional file formats, language choices or other platforms. The right fit depends on whether you are assessing reading range or improving and inspecting text in other ways.