One to six dice, rolled on the board where the whole class can see the result. No sign-up and nothing to install.
Pick how many dice and press roll. The faces are drawn large so a pupil at the back reads the same number you do, which matters the moment a roll decides whose turn it is.
Useful for more than games: pick a paragraph, choose which group presents, set how many sentences to write, or settle who goes first without anyone claiming it was rigged.
Learnify turns the class into a role-playing game run from the teacher's screen: points for real reasons, avatars that evolve, attendance, groups and quiz games. Pupils need no devices and no accounts of their own.