Free online text readability analysis tool - Flesch/Gunning Fog/SMOG/Coleman-Liau
Flesch阅读轻松度分数范围0-100，分数越高越易读。90-100=非常容易（5年级），60-70=标准（8-9年级），30-50=较难（大学水平），0-30=非常难（专业/学术）。大多数推荐文档目标60-70分。
Flesch-Kincaid年级基于句子长度和音节数，结果为美国年级水平；Gunning雾指数也用句子长度和复杂词（3+音节），适合商业写作；SMOG指数更保守，适合医疗文本；Coleman-Liau基于字符数而非音节，计算更客观。多种算法结合可更全面评估。
使用短句（平均15-20词）、常用词汇、减少被动语态、每段一个核心观点、使用列表和标题拆分文本。目标是Flesch分数60+，Flesch-Kincaid年级8以下。
Yes, Readability Score Calculator is completely free to use. No registration or login required — all features are available immediately.
No. Readability Score Calculator uses client-side processing — everything runs in your browser. Your data never leaves your device, and the tool works even without an internet connection.
Absolutely. All processing happens locally in your browser. No data is sent to any server, so there's zero risk of data leaks. Your information stays completely under your control.
Yes. Readability Score Calculator is fully responsive and works on phones, tablets, and desktops. The interface adapts automatically to your screen size.