I first had the free version and have promised me on the version better options but both versions are the same. The 99Cent version I could have saved me there is no difference can be seen in both version. In addition, some E Books are displayed that are not free, that if you are not careful you ordered this in the belief that they are free. Also in the Pro version is the same mistake as in the free version, if there are 180 books for the category hear it at 100 on would have thought in the Pro version of all books would be displayed but error was not so. The free version I would with 3 points rate but for this version even if it costs only 99 cents I give only 1 point.