HTML Code Snippet to Detect Mobile App

Hi, Very simple and easy for someone who is conversant with HTML and Scripts. I want to create a link in my email whereby when someone clicks on it, it will detect: 1. if user is on computer, open a URL in the browser 2. if user is on iphone, check if he has the instagram app and open that 3. if user is on android, check if he has the instagram app and open that 4. if user is on any other platform, open a URL in its default browser