Till now I was using Groww for buying mutual funds because it was Easy, Fast and Transparent and the main thing was Investing is FREE in Groww. Now recently they have introduced Buying Stocks which is also almost free as shown below :
Why I am saying almost free because you need to pay for trading which is around 0.1% of your turnover. The Demat account charges are Rs. 13.5/company ($2) per day + GST on the day of SELLING stock.