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Nagware (also known as begwareannoyware or a nagscreen) is a type of shareware that reminds (or nags) the user to register it by paying a fee. It does not count as malware unless it is a rogue program. It usually does this by popping up a message when the user starts the program, or intermittently while the user is using the application. These messages can appear as windows obscuring part of the screen, or as message boxes that can quickly be closed. Some nagware keeps the message up for a certain time period, forcing the user to wait to continue to use the program.

The intent is generally that the user will register or buy the program to get rid of the trial version's annoyance.</p>

Examples of nagware are SpotifyWinRARWinZipmIRCBitDefender Free Edition, AVGAvira Free Edition, Norton Internet Security and Snood. Some of these programs pop-up a window after their trial period is up telling the user to buy the program. LimeWire or Avira Free Edition similarly reminds the user to upgrade to the Pro version, although the free version is not a free trial.