iCollect (App)

This was wonderful - I would never buy the duplicate DVD again.

But then after 75 DVD's it was going to cost money 

- they didn't get any - but I did buy a duplicate the following week!

Cost: Free then

Ease of use: very simple

Comment: so I remember what DVD's I purchased

Link: https://apps.apple.com/us/app/icollect-everything/id559036969