Because it uses MusicXML scores, SeeScore can display the music flexibly, fitting it to your screen at any zoom level. This is a leap forward from other score display apps which use PDF files containing just a fixed picture of a page of music. Since it reads the actual music, SeeScore can display just the parts you choose, at the magnification you choose, without wasting precious screen space on the page borders.
The music is continuously scrollable with no page breaks at all - why have pages if you don't have paper?
It can auto-scroll with the bar you are playing always centred on the screen. You can set SeeScore to highlight the current bar, and even sound a metronome if you like. Unlike all other score display apps, SeeScore reads the music to take account of the current metronome marking and time signature while you are playing. Because of this, the metronome will always tick the right number of beats in each bar! If you are a little behind or ahead of SeeScore you can just touch the bar you are on, and it will catch up.
SeeScore can transpose the score for you to play. Notes, key signatures and harmonies are all correctly handled, but don't worry - the original file is not changed and you can always revert back to how it was.