Pulse, Dappers and Stanley Park will all be broadcast on the channel's official website a week before being aired on television.
Viewers will also be able to add their comments about the shows on BBC Three's blog.
Supernatural drama Pulse stars Claire Foy as a woman who returns to medical training after her mother's death but starts to notice strange events in her hospital.
Meanwhile, Being Human's Lenora Crichlow joins Ty Glaser for Dappers, a comedy about two single mothers, and Pulling star Sharon Horgan appears in comedy drama Stanley Park, which focuses on a group of friends living in a London suburb.
BBC Three's controller Danny Cohen said: "We want to keep experimenting with the relationship between the web and TV, and these pilots provide a great opportunity to get the BBC Three audience discussing our programmes and helping to plan our future."
Pulse will premiere online on May 27 while Dappers and Stanley Park will air on the website on June 3.