Automatically detect user device when entering the site

Hello everyone!

I want to create site. When user entering on my website from iOS, i'll show him a link to app my website in App Market . When user entering on my website from Android, i'll show him a link to app my website in Play Market.

I searched the internet for examples and found only one https://ift.tt/37YCpGM
Please, help me.

from JavaScript https://ift.tt/2HSNIWq
via IFTTT