If you are getting notifications from InitialSprint, then your Mac is infected with adware. InitialSprint is adware for Mac.
InitialSprint changes setting in your Mac. First, InitialSprint installs a browser extension in your browser. Then, after InitialSprint hijacks your browser, it modifies settings in the browser. For example, it changes the default home page, modifies search results, and displays unwanted pop-ups in your browser.