Question: which fonts are most readable?
Answer: Helvetica. Along with Georgia, Helvetica is considered to be one of the most easily read fonts according to The Next Web. ... 
PT Sans & PT Serif. Can't decide whether serif or sans-serif is for you? ... 
Open Sans. ... 
Quicksand. ... 
Verdana. ... 
Rooney. ... 
Karla. ... 
Roboto.