In reply to critter:
I'd just add to have an alternative plan even before the slog up to the hut, and be prepared to change or outright abandon any plans if the forecast or conditions seem to be bad. Not going out if not 100% sure (or changing the route) is usually the only winning move – too many people fall into heuristic traps every year, as the very nice avalanche victim symbolic cemetery in the Slovak Tatras attests to (quite ironically situated quite close to a few historical avalanche paths, and actually closed for most of the winter season due to avalanche danger, IIRC).
> Since Strava killed FATMAP the consensus is falling between Outmap and Outdoor Active IMHO.
IIRC, FATMAP was pretty shite anyway.
If you really want to get serious about slope angles, use the particular country's official government maps.
Almost all of the Alpine (and some of the Tatra's) countries have more or less recently opened their über-precise government LiDAR elevation data to the public, with much better precision compared to all the older commercial or OSM maps relying on outdated and imprecise DEM data.
Slovakian Tatras maps even show all their historical avalanche paths coloured by frequency in addition to the slope angles, and Swiss Topo maps are probably the most precise free DEM slope maps in the world as of now (well, apart from the few Easter Eggs in there, but those don't actually show up in the slope maps, only in their hand‑drawn contour maps).
Outdoor Active used to be pretty nice for offering the rather nice (paid) ÖEAV Alpine maps, but nowadays the OA app itself is IMHO just another victim of the current digital enshittification.
Post edited at 00:27