Dunno about apps, but I made Tesseract’s modlog viewer highly filterable on the web. It’s not as great on mobile as it is on desktop, but you can filter by user/moderator/community as well as mod action on both. (the same info is available, it just looks better on desktop. improving mobile modlog is on my to do list but I only ever need the basics when I’m away from a PC 🤷🏻‍♂️).

I tried to make it like Kibana/Splunk where you can click a + or - next to an entity to add/remove it to the filter.

The hosted instance I run defaults to Lemmy World, so you can actually view LW’s modlog live at https://tesseract.dubvee.org/modlog