Secured credit cards
You deposit $200–$500 as collateral. The card reports as revolving credit — which is what most thin files are missing. Great if you want to rebuild utilization behavior and you can keep the card open for 24+ months.
Credit builder loans
A bank holds a 'loan' (typically $500–$1000) in a locked account. You make monthly payments, and when it's done, the money is released to you. It reports as installment credit — perfect if you already have cards but no installment history.
The right choice
If your FICO mix is missing a revolving account, pick the secured card. If it's missing an installment line, pick the builder loan. If both are missing, do the secured card first and layer the builder loan 90 days later.
