You heard the name at a match and went looking for it later. Plenty of people spell it Roofio, because that is how it sounds. It is said roo-fee-oh, and it is spelled Rufio Stats. This is the same app, and you are in the right place.
It's the chant gyms yell after a big down-block. The spelling follows the chant, not the sound, which is why the search results for the other spelling are a bit thin.
A free volleyball stat app for iPhone and iPad. During a match you tap the player and the action: serve, pass, set, attack, dig, block, and where on the court it happened. It keeps score, tracks rotations, and builds the stat sheet as the match happens. Two or three people can split the work across devices and it all merges into one game. It works offline in the gym and syncs when the signal comes back.