Click on any kanji to show dictionary information; double-click to make that kanji the main one.
I built this tool to explore all components of kanji—not just radicals—and find relations to other kanji. For example, 塾 and 熟 have different radicals, but have 11 strokes in common: a third kanji (孰) with the same onyomi (ジュク) as the others.
A component could convey sound or meaning; or it could be a result of changes and simplifications over time. This tool looks purely at visual connections and avoids making deeper conclusions that could be wrong. It does point out:
Shared onyomi or shared kunyomi + meaning
Alternate forms of radical
At least two similar sites are worth checking out: