These apps are classroom tested in my Reading Resource room. It is difficult to find apps that appeal to the intermediate student as many are too 'babyish'. The students respond well to all of these from my third graders to the fifth graders. Time on task is amazing with these. The apps allow me to work individually or in very small groups as we do a little "center" time in RR. Hope they are helpful to you. Some do have a cost and some don't. But those with a cost are worth every penny in my opinion.