Olx.in is a very popular fast emerging site. Its used by large number of users.
Its app is used more than its website.I am personally using OLX since a long time & all the time I got successful in selling my old stuff for the good price.
Olx lists your ad within minutes & you get quick replies for your listed products.You will get more replies for Mobiles, Second Hand cars, Computers, Properties and all.Its app experience is wonderful most of the people use app now a days and Olx updates its app time to time to give you better experience.
However after few ad posting now they are charging small fees of about 100-200 for posting more ads.So if you have old stuff or used items at home go and get Olx.