跡 is a Japanese kanji written with 13 strokes, listed here under the keyword “tracks”. It is built from 亦 (apple) and 足 (leg). In Remembering the Kanji by James W. Heisig it is frame 1883.
On KumiJi Glyph Explorer, open the parts search and type “apple” + “leg”. 跡 is among the results, together with every other character containing the same shapes.
Open 跡 in the interactive kanji search
to expand every part down to its smallest pieces, add your own names and mnemonic stories,
or search for other characters by their parts.