Kate Stewart had a torch app on her mobile phone. (AUDIO: Invocation)
Other apps included Instagram (AUDIO: The Conspiracy, TV: For Tonight We Might Die) and Candy Crush, which the Twelfth Doctor considered to be annoying. (PROSE: The Blood Cell)
In 2011, a new app on DI Ralph Finch's iPhone allowed for thermal imaging, enabling him to find Gwen Cooper's father, Geraint Cooper in their basement. (TV: The Gathering)
Dawn Shale met Duncan B. on a dating app, and the two hooked up. In the end, both were infected by an alien sexual parasite, resulting in Dawn's death. (AUDIO: Love Rat) Tyler Steele was a frequent user of such apps, (AUDIO: Changes Everything) though in time his use declined. Tyler was mortified to find Norton Folgate was using these apps to hook up with strangers while inhabiting Tyler's own body. (AUDIO: Another Man's Shoes)
In 2020, Tania Bell introduced Helen Sinclair to a mobile app involving pigs. Helen was confused about one group of characters' quarrel with the pigs, and Tania explained the game did not present much backstory. (AUDIO: Wild Animals)
- This clearly alludes to the mobile game Angry Birds, in which cartoon birds are launched at pigs on various structures.
Verger had a dating app, Rabbit Chat & Date, on his mobile phone. (PROSE: Iris Wildthyme and the Unholy Ghost)
Oblation involved an app with which people could tag the homeless. (AUDIO: Hostile Environment)
The Twelfth Doctor speculated that a colony planet equipped with Emojibots might have an app used in place of going to the toilet. (TV: Smile [+]Frank Cottrell-Boyce, Doctor Who series 10 (BBC One, 2017).)
The Doctor sometimes referred to their sonic screwdriver's software and settings as "apps" for various situations. (TV: Closing Time [+]Gareth Roberts, Doctor Who series 6 (BBC One, 2011)., Can You Hear Me? [+]Charlene James and Chris Chibnall, Doctor Who series 12 (BBC One, 2020).)
The Thirteenth Doctor retroactively added an app called Piloting Made Easy to Ryan Sinclair's mobile phone to allow Ryan to land the VOR plane after the cockpit was destroyed by a bomb. After Ryan levelled out the plane, the app reactivated Daniel Barton's preprogramed course, causing it to safely land at one of Barton's airports. (TV: Spyfall [+]Chris Chibnall, Doctor Who series 12 (BBC One, 2020).)
Dan Lewis had an app on his mobile phone for identifying the constellations in the night sky. (TV: Legend of the Sea Devils [+]Ella Road and Chris Chibnall, Doctor Who Easter Special 2022 (BBC One, 2022).)
In an alternate timeline, while doing an interview, Roger ap Gwilliam noted that the "ap" in his name meant that he was a Welshman, born in Wales, that it wasn't "one of those apps that you used to have on your phones in the old days," that it meant he was a "son of Wales." (TV: 73 Yards [+]Russell T Davies, Doctor Who series 14 (BBC One and Disney+, 2024).)