Kylie supporters came out in droves 10 days ago when the Kardashian/Jenner sisters' pay websites launched, with 74% of users downloading Kylie's app -- Kim was in third place with 9%. But we got hold of the numbers, and the tables are turning ... fast.
With more than a million users now using the pay sites, we're told Kylie has 40% of the users ... Kim stands at 30%. Kylie is clearly still winning, but we're told there has been a steady and continued narrowing of the gap, and Kim could overtake Kylie in days.
Kim -- who does not like losing to anyone -- has turned up the heat. She's posted ass-shots and other hot pics on her various social media platforms, driving fans to her app.
The app source who's worked with the family says Kim knows how to use social media better than anyone in her family -- Kylie included -- and when she wants to win, she'll win. And she wants to win.
Kim posted a video with Kylie promising to pass on the media torch and teach her all of her tricks. Our advice to Kylie? Michael Jordan used that trick before with the youngins ... and it worked every time.