Worth writing kanji?

My preferred option is Anki on mobile with the „scratch pad“ enabled. Free (just Anki is a one time fee if you are on iOS but completely worth it for me), flexible (I have a WK based deck that I‘m using for this) and not yet another app to use. You have to grade yourself on how well you did but I don’t have a problem with that.

This is not the deck I’m using, mine has all the mnemonic info etc on there too but unfortunately it is data from before the big content changes. But to give you an idea: