Voice Activated Summoner Timer or VAST is a free Android app developed by Selwyn420 that helps League of Legends players keep track of summoner spell cooldowns. The app can be used either through voice commands or the graphical user interface (GUI). It is designed to work on both Summoners Rift and Aram.

One of the most impressive features of VAST is that it automatically detects enemy champions and their summoner spells. The app also takes summoner spell reduction into account, such as Insight and Boots of Lucidity. It plays an audio cue when summoners are up and allows for customizable reaction time and warning offset. Overall, VAST is an essential tool for any League of Legends player looking to improve their gameplay and stay ahead of the competition.