Styli for generating alert notifications to prevent unintentional marking of interactive devices are disclosed. A disclosed stylus includes a housing and a processor. The housing is to interchangeably receive a physically marking nib and an electronic marking nib. The processor is carried by the housing. The processor is to determine a received nib is the physically marking nib. The processor is further to determine a distance between the stylus and an interactive device satisfies a threshold. The processor is further to generate an alert notification based on the received nib being the physically marking nib and the distance between the stylus and the interactive device satisfying the threshold.