One important interest in launch items is any changes in the system over time. Therefore a scan history with an automatic comparison would make KnockKnock extremely more useful.

• The results of every scan is stored in a local database (e.g. SQLite or JSON/XML file structure)
• For each item in each list the following information is stored:
  • Path
  • Hash
  • Size
  • Create and modified time
  • Entry point file (plist) or similar
• For each scan:
  • Computer name (for database merging)
  • Date/time of the scan

Using this "database" of previous scans, KnockKnock can present a delta based on a previous scan:

• Highlight changed items
• Highlight new items
• Highlight removed items

Somewhere in the application, a list of all previous scans is accessible.

• The user can select a single entry in the list to display the items of a previous scan.
• The user can choose the two entries in this list to show a comparison.