fastest app to pay credit card bill

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Phonepe may be?

Paytm, INSTANT

If you plan to pay using upi or NetBanking, then the respective app or web portal of the credit card itself

I’m using ICICI credit card.. paid from Paytm cred amazon and Mobikwik.
With Cred and amazon it was instant.
With Paytm I used to pay through Debit card it took around 45 mins.
With Mobikwik I used to pay through Debit card and it took several hours.

These payment providers evolve over a period of time. Cred initially used to take 2-3 days, now a few hours/minutes. Likewise, the type of settlement also matters. If cred goes through billdesk, then they will also take 2-3 working days. But bear in mind that settlement in 2 days from some XYZ app will not be the same down 3-4 months, if they have plans to upgrade/downgrade. So in a nut shell, use what suits you.

Edit: Coming back to the question, the fastest(most reliable) will be third party transfer from card provider bank or a NEFT transfer from any bank to the card. The so called cred can also take a back seat if there is any glitch in their software or technology. But if you are after rewards on card payment, I will leave it your choice.

Always pay during Banking hours for faster credit

For me it’s CRED because all my payments have been processed swiftly without any issues.
Dimers ab maro mat muje
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Use “Cred App” for Credit within minutes.
Or
Use Respective app

For ICICI CC, use their official iMobile App for the fastest settlement. Simillar goes for other cards, use the respective bank app. Cred is also good, takes 1 min to an hour sometime.

i prefer CRED