Frequently Asked Questions
Six most frequent questions. See the Guide for deeper formulas.
Q.Is my pasted text sent to a server?
A.No. All calculations run in the browser. The text is only cached in your browser's localStorage so you can resume later. Nothing leaves your device, so copyrighted or confidential passages stay private.
Q.How accurate are the CSAT, TOEIC, and Lexile mappings?
A.Based on public formulas and research. Expected errors: ±1 CSAT band, ±50 TOEIC RC, ±80L Lexile. Official CSAT scores depend on question traps and yearly cutoffs too — our estimate is limited to the difficulty of the text itself.
Q.Why do SMOG and Flesch-Kincaid disagree on the same passage?
A.They weigh different signals. SMOG focuses on polysyllabic density, Flesch-Kincaid on sentence length + average syllables, Dale-Chall on vocabulary rareness. We average the grade-based scores for the CSAT mapping — individual scores tell you which axis is driving difficulty.
Q.How large is the CEFR dictionary and what's the source?
A.About 3,000 lemmas spread across A1-C2, curated by us by cross-referencing the Cambridge English Profile, Oxford 3000/5000, and the Dale-Chall word list. Inflections (plurals, past tense, 3rd singular, comparatives) auto-resolve to the root. Words not in the dictionary show in gray — typically proper nouns, technical terms, or rare inflections.
Q.Can I upload PDF or DOCX files?
A.Not yet — the MVP accepts pasted text only. PDF/DOCX upload, per-page analysis, and multi-passage batch compare are on the roadmap. For now, select the PDF text layer and paste it in.
Q.Does it support Korean passages?
A.English only for now. Korean syllable counting, POS structure, and Eojeol boundaries are incompatible with Flesch-style formulas. A dedicated Korean readability tool is on the roadmap.