Show HN: Use the right credit card every time

I have 4 credit cards and kept guessing wrong about which one was “safe” to use. The issue: I was only tracking current balance/utilization, not statement closing dates.

Your balance gets reported to credit bureaus when your statement closes — not when you pay. So even though I pay in full every month, I was spiking my utilization without realizing it.

I built WhichCard to fix that. It shows: Available spend under 30% on each card Days until each statement closes Red / yellow / green indicators for quick decisions

Example: Chase shows $450 available but closes in 3 days → Don’t use. Capital One shows $890 available and just closed yesterday → Safe.

Timing turned out to matter more than I expected.