I've replied to you privately on email for data privacy.
The correct way to see new users would be as follows
User Actions > 13th - 16th Sept > App Launched > Filter by Properties > First Time > Yes. It returns a number close to GA.
The drop off is significant from App Launched First Time (New Users) to Last Swipe; You can check this as follows:
Funnels > 13th-16th > Step 1: App Launched (first Time) > Step 2: Last Swipe. The numbers vary by a lot.
The difference (GA New Users - CleverTap New Users) is because we're reporting only uniques launches. Let's have a call if you'd still like to clarify.
Thanks for the suggestion, I'll point out the discrepancy to the engineers.