Last Second Coupon ‑ Exit Pop

I never leave reviews without trying an app for at least 10 days, I am wondering why people do this right after installing... So, this one is really a top notch for my store. For 10 days I made 1000$ additionally coming from the discount code order. This money is absolutely an additional to me because I used the option to show the pop up when customer try to close my website, so - 5 starts - the app do what it says. 6$ were paid yet from the first order. I hope things go on like this.
My only advice - there should be an option that allows you to not let customers use the code if they add a product on a sale to their cart. I messaged a shopify guru and he promised to write an email to Hextom. And one more thing - they didn't reply to my asking whether I can get the same app for free for my second store which drives under the same account. But anyway - the app is worth it.