title_body: Kindle Paperwhite VS Kobo Glo: Screen Contrast Comparison The two e-readers are almost evenly matched in the physical features department. The only variable left out is the quality of the screens.
  
  Both have great support structures (e-book stores) that may differ between several countries around the world (in my own country, the Kobo has two online stores that sell localized - translated - ebooks, while the amazon is rather lacking).
  
  So I am going to compare only the devices technical specs.
  
  Pros for each one (mostly taken from here):
  
  
  Kobo Glo:  
  
    
    28g lighter (13% lighter than Kindle)
    9mm shorter
    has Micro SD slot
    dedicated light switch button
  
  
  vs
  
  
  Kindle Paperwhite  
  
    
    1mm thinner
    USB mass storage (can connect to thumb drives?)
    has a 3G version (I won't get a 3G e-reader though, but as reference)
    WHITE E-PAPER DISPLAY
  
  
  Now, the real question is:
  
  I had not the opportunity to put both devices side-by-side in front of me to test their screens. What is the contrast ratio on those two devices?
  
  Bonus points if answer points me to tech sheets with the contrast info.
upvoted_answer: The Paperwhite uses a Carta e-ink screen with a contrast ratio of 15:1 however, here's a German test that says the contrast actually is 12:1 (assuming Google translate was accurate -- my German is horrible). It has comparisons with other models, too. 
  
  The Kobo Glo uses a Pearl screen with a contrast radio of 10:1
  
  Here is an older comparison of the two models that puts the Kindle Paperwhite's contrast ratio at 11.5:1
  
  Also, in terms of lending Kobos are compatible with library lending systems.