Open their Snapping With list from one username
Paste their handle and the Best Friends, the snap score and the My Eyes Only requests return with it.
Free to run, and it requests their username, never yours.
From the outside a Snapchat account offers you a handle and a picture. The eight people it ranks as Best Friends, the ones it is snapping this week, the memories behind My Eyes Only: that side belongs to whoever is signed in.
Snaptrace reads it from the handle. Type the username and the ranked list comes back with the names it is snapping now, the snap score on the account and the My Eyes Only memories it holds.
There is nothing to install and nothing to sign into. Their phone remains in their pocket, and your own Snapchat account is never asked for.
If their handle is open in front of you right now, start there.