Like all other card issuers, Capital One has some unofficial rules about who will be approved for a new card and how often you can get a new Capital One card. Here are the current application restrictions Capital One has in place:
Limit on number of cards: Capital One limits the number of Capital One-branded consumer cards you can have to just two. This limit doesn't include Capital One's co-branded cards (e.g. Walmart Store Card) or small business cards.
Timing of applications: Capital One will only approve you for one consumer or small business card every 6 months.
Pre-approval: Capital One offers a 9-step pre-approval form for you to see if you're pre-approved for any Capital One cards. This can be a useful tool to see if you meet the Capital One application restrictions.