The 214 building blocks of kanji. Pick a radical to see every jōyō kanji built from it — sorted simplest first, with the radical highlighted.
Radicals (bushu) are the recurring components every kanji is made of — learn to spot them and new kanji stop looking random. Each card shows a radical, its meaning and how many of the 2,136 jōyō kanji use it.
Radicals are also how kanji are indexed in paper dictionaries. Every character is filed under exactly one classifying radical.
To look a kanji up, you first find its radical by number (1–214), then count the remaining strokes — the strokes added after the radical — and scan that small group.
This “radical + residual stroke count” method lets you find a character even when you have no idea how it is read.