I've never heard of such a site. I don't like downloading unnecessary apps to my phone, so I'm not in a hurry to download your app yet, even though it has an excellent design. An annual discount of only 20 percent sounds like something unprofitable. Take an example from https://www.dontpayfull.com/explore. There are a lot of profitable links here. In addition, there's no need to download anything because this is a website that I can easily open in a tab in the browser. I never even close this tab in my Safari. The site doesn't take up space and shows me the most profitable opportunities to save on goods.