There was an app (mtnhub) I used at one point that overlayed USGS maps and then you could filter Slope and aspect that was free. Do you guys use anything like that for planning?
I'm a big fan of Caltopo.. and I think slope and aspect is available on the free tier. $20/yr if you find it useful, and allows the map/tile downloads.
HA that's the one I downloaded about an hr ago, seems close to what the other was, actually way more options
OnX hunt maps has a pretty useful aspect shading tool. I like to keep it simple and avoid app clutter and data pimping.