Following is the list of Online budget hotel aggregators in India in the form of Mobile Apps
Oyo Rooms - Over 400k room-nights booked per month, 2.5k properties across 110 cities
Zo Rooms - 120k room nights booked per month; 35 cities with 600 hotels and inventory of 6k room nights
Stayzilla - 210k room nights per month; 35k properties and inventory of 800k room nights
Fabhotels.com - Present in 6 cities with tie-up with 50 hotels
WudStay - 3k room nights per month; 21 cities with inventory of 2.5k room nights
Zip Rooms - Present in 20 cities with tie-up with 45 hotels
Treebo - Recently Started.