Nissebus is an iPhone application developed by Amanda Dahlin, available for free in the Lifestyle category. The app assists in organizing daily mischief for your household elf. Users can access a variety of mischief ideas and schedule them on a calendar. Upon launching the app, users can either select from a range of predefined plans or customize their own. Each mischief idea includes a list of required materials and preparation steps. The calendar view supports password protection to ensure the secrecy of the elf's assistant, allowing users to view the daily elf letter on the phone, transcribe it, or print it out. Additionally, users can create their own mischief ideas.