Variable for type of device platform

Hello i use for about page, link for request support like:

[Send email](mailto:help@EXAMPLE.COM?subject=app.EXAMPLE.COM/#%version-name%).

this email will automatically create a request to the internal helpdesk with the topic containing the version of app and it will help to determine the old and new build. But it’s hard enough to understand ios or android.

I wanna have variable like %app-platform% and convert to ios & android (or other)
optional: may be also good add variable with device code (like from browser user-agent)

Thanks.

Two good suggestions in one day. I voted on the other one so can’t on this one.