Spritz is described as 'The time consuming part of reading lies mainly in the actual eye movements from word to word and sentence to sentence. In addition, traditional reading simply takes up a lot of physical space. Spritz solves both of these problems' and is a Speed Reading tool in the news & books category. There are more than 25 alternatives to Spritz, not only websites but also apps for a variety of platforms, including Android, iPhone, iPad and Linux apps. The best Spritz alternative is Spreeder. It's not free, so if you're looking for a free alternative, you could try SwiftRead or stutter. Other great sites and apps similar to Spritz are Eyeq, Reasy, Reedy and iReadFast.
it is very customizable for ease of reading