Spark Mini is an open-source companion app for the Quest version of Echo VR developed by Ignite. It shows you server location, server score, team names, and has match hosting functionality.
Spark Mini is only needed if you do not have a PC of any kind. The desktop version of Spark is much more fully featured and works with both the Quest and PC versions of Echo VR.
Spark Mini cannot facilitate you spectating your matches for video recording purposes, since the spectator version of Echo VR made by RAD does not run on phones.