It works! pic.twitter.com/Kz46Ygk8ze— Kathi Kersznowski (@kerszi) June 8, 2018
Padlet isn't the first to offer this kind of sticky note digitization capability. Post-it has offered it in their free iOS app for the last four years. The Post-it Plus app lets you snap a picture of a set of Post-it (or other sticky notes) and then manipulate those notes in the app.
While not designed specifically for digitizing sticky notes, Microsoft's Office Lens apps will convert notes written on paper into digital notes that you can edit. You can use the digitized notes in OneNote, Word, and PowerPoint. Get the Android version here and the get the iOS version here.