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I have an app called Apiary Book (Play Store link) which helps me keep organized.
If it's a short inspection, I'm checking seams of bees, evidence of eggs and capped brood, levels of honey and pollen, if they're roaring and showing signs of stress. Noted is if a box was added or anything special was needed or seen/experienced. Then post-inspection care write-up for next week to next month's care.
I've tried a couple, and ended up liking one called Apiary Book the best.
It's not the prettiest, but I find it the most functional for me, I use apiary book out in the field.