The simplest way to catalog your Product Keys.
Forget scribbling down your product keys or storing them in a text file. Store your keys once and always have them available.
While the minimal look of it may seem odd, it has all the features you need to add, modify and remove products and keys, while maintaining extra functionality like backup/restore and and importing data as CSV.
Your entire product catalog is intelligently synced between all of your iCloud-enabled devices. Additionally, all your data is password protected.