Find Out Whether a Prepaid Card Can Improve Your Credit Score
Question: Will a Prepaid Credit Card Improve My Credit Score?
Answer: No. Since prepaid cards are not actually credit cards (they’re actually like debit cards), they’re not listed on your credit report. Therefore, they aren’t included in your credit score.
A secured credit card, on the other hand, requires a deposit similar to a prepaid credit card, but purchases don’t take away from your deposit. Instead, you’re required to make payments on your balance because it’s an actual credit card.
Certain secured credit cards are listed on your credit report and can improve your credit score if they’re used correctly.
Source...