speed reading app that works on with kindle to read mobi and pdf files

I just learned about RSVPspeed reading. Using the spritztool I am easily able to read 700 wpm, but spritz to my knowledge doesn’t work with kindle.

Is there an app similar to spritz that does work wtih kindle and will let me read Mobi and PDF files?

If need be I’ll download another reader program (other than kindle) but it has to be able to read my mobi and pdf files I currently use the kindle for.