Which demat brokering app do you use?

IPO investors, I have this question which app do you use for IPO application and management? Is there any particular reason why you use that very app?

I am using Zerodha because my brother told me its good, and now I've been using it half a year. No questions asked, no second thought and now I discover it has 300 rs AMC (Annual maintenance charge).

I discovered Groww has biggest client numbers, followed by zerodha.

So Zerodha? Dhan? Groww? Please do share what app you use.