No. Even after unblocking, they cannot see any Snaps or Stories you posted while they were blocked. Furthermore, because blocking deletes the chat history, they cannot see old messages. They only have access to what you post from the moment they are added back as a friend moving forward.
One of the biggest tells isn't the unblocking itself, but what happens after .
: If they previously searched for your username and couldn't find you, your profile will now reappear in their search results. can someone see if you unblock them on snapchat
: Unblocking someone does not automatically add them back to your friends list. Blocking "destroys" the friendship, so you must manually re-add them to restore it.
When you block someone on Snapchat, the chat history is deleted from both sides. When you unblock them, The conversation is gone forever. They only have access to what you post
The results were clear. No notification. No alert. No “Lena has unblocked you” message in his chat. Snapchat doesn’t send one. All that happens is his name quietly reappears in her search, and his stories become visible again—provided he’s still public or hasn’t blocked her back.
Almost immediately, her heart lurched. A question surfaced, cold and sharp: Can he see that I did this? : Unblocking someone does not automatically add them
Crucially, unblocking someone does not automatically add them back to your friends list.