Free tools
Atlas Runa tools
Practical language helpers built on the same static analysis Atlas Runa uses for reading — no account required.
Chinese pinyin & zhuyin annotator
Paste simplified or traditional Chinese and annotate each character with Hanyu Pinyin or Zhuyin (注音 / Bopomofo). Runs in your browser.
Chinese character knowledge test
Adaptive quiz that estimates how many Chinese characters you know — swipe or use arrow keys, simplified or traditional. Inspired by Hanzi Mountain.
Word knowledge test
Estimate how many words you know in a study language. Adaptive sampling from frequency lists — Italian, English, Spanish, Chinese, and Japanese.
Language difficulty estimator
Paste text in a study language and get a CEFR placement (A1–C2) with vocabulary band breakdown and difficulty dimensions.