Hi Product Hunt,
I built Pinyin Knowledge Ball to put relationships that are usually split across pinyin charts and vocabulary lists onto one screen.
Type something like ma. The page opens into tone-marked syllables, common characters, useful words, examples, and audio. I also added comparison lessons for pairs such as an/ang and zhi/zi.
It's free, no account required, and progress stays in your browser. The lesson library is still growing. I'd love to know whether the map feels clearer than a normal pinyin table, and which sound comparison you'd want next.