Is Capital One Quicksilver a Visa or Mastercard?

Capital One Quicksilver could either be a Visa or a Mastercard. Capital One issues cards on both networks, but there is no way to choose which network your new card will be on.

The card network for your new card isn’t based on your credit score, card terms, rewards or credit limits either. A card network is simply the company that helps process credit card transactions and determines where a card is accepted. Having said that, both Visa and Mastercard benefit from the most extensive worldwide acceptance, so you’ll have no problems using your Capital One Quicksilver, regardless of its card network.

There must be two versions of the card then, that or they kept it MC when I requested a product change. Originally had QS One card and after about 1 year (maybe 1.5 years), I requested a product change to QS. My QS card is MC and not Visa. The QS One card is a Mastercard, so I am guessing Cap1 did not change it over to the Visa during product change. Only difference between the two is annual fee and MC vs Visa. Hasn't bothered me once that my QS is MC and not Visa. 

My Quicksilver is a Mastercard and my credit limit is $800

I had my Platinum MasterCard converted to a QuickSilver card as well and it remained a MasterCard. 

In the months since I posted my review above, it seems CapitalOne has made some further changes to their Quicksilver lineup.  Regaring what I posted above in Item #2, the base level Quicksilver card (not to be confused with the QuicksilverOne) is a MasterCard “World” card, so not much of a change there.
The bigger news is what I wrote in Item #3; as reported elsewhere, all new Quicksilver cards are on the MasterCard network and I assume all replacement cards currently on the Visa network will be switched at renewal time.  My wife just got one of the Quicksilver cards with a higher limit (i.e. a limit of $5,000 or higher), and it is a MasterCard “World Elite”, which provides some additional benefits over the “World” version.

Hoping to eliminate some of the confusion here; per the Capital One web site, there are 3 separate and distinct versions of the Quicksilver credit card:

1. QuicksilverOne Rewards
   1. Credit requirement: Fair
   2. Annual fee: $39.00
   3. Card type: MasterCard
   4. Rewards: 1.5%
   5. Bonus cash: $0.00
   6. Intro APR: none
2. Quicksilver Rewards
   1. Credit requirement: Good
   2. Annual fee: $0.00
   3. Card type: MasterCard
   4. Rewards: 1.5%
   5. Bonus cash: $0.00
   6. Intro APR: none
3. Quicksilver Rewards
   1. Credit requirement: Excellent
   2. Annual fee: $0.00
   3. Card type: Visa
   4. Rewards: 1.5%
   5. Bonus cash: $200.00
   6. Intro APR: 0% for 15-months

The above said, I have the card outlined in item #2 above and per the agreement CapitalOne sent me, my card has “0.0% intro APR on purchases for 9 months; 26.99% variable APR after that”. I’m not sure if their web site is just behind their current offering, or if they kind of have versions 2.a and 2.b of this particular card.