Quote from luishp on April 4, 2020, 4:58 pm

I think it depends on the application you want to launch, the operating system you are targeting and the deployment method you choose. For example you can place a button and add this to the href property to launch WhatsApp to a given telephone number:

https://api.whatsapp.com/send?phone=123456789

This sample will work on most cases.

Quote from donbwalker on April 5, 2020, 4:08 pm

Thanks again.  I'm curious where you got that string.  Is the api.____  a standard thing or does the string vary based on the app.

In my case it would be in an android phone.  Perahps an ios later.

If I wanted to launch pintrest as an example.  just to the start page.

Quote from luishp on April 5, 2020, 6:43 pm

Most webs will redirect to the installed app (if exists), so in your case just link to Pinterest.