The 'path' is marked as mountain_hiking in the SAC Scale (see https://wiki.openstreetmap.org/wiki/Key:sac_scale). It's clearly not as difficult (or exposed) as Crib Goch which is T4 (the next-but-one level), so there may be a case for using the T3 level. There may be one or two places which are harder (as I've one on the route into Cwm Glas Mawr), but it's a long time since I've done it. I think it's classified as a Grade I scramble too.

Unfortunately maps.me and other apps dont necessarily read the detailed hiking information which is needed to interpret paths in the mountains, so you really need a contour map to assess things properly.

