Innotiom email templates are designed for and tested on numerous email clients and devices. Here's an overview of what type of compatibility to expect.

Email Client / DeviceCompatibility
Apple Mail 8
Apple Mail 9
Apple Mail 10
Outlook 2007
Outlook 2010
Outlook 2011
Outlook 2013
Outlook 2016
Outlook 2016 (Mac)
Android 4.4
Gmail app for Android, iOS✓ *Works, but media queries not fully supported
iPhone SE
iPhone 5S
iPhone 6
iPhone 6 Plus
iPhone 7
iPhone 7 Plus
iPad Air
iPad Mini
iPad Pro
AOL (Chrome, Firefox, IE, Safari)
Gmail (Chrome, Firefox, IE, Safari)
G Suite / Google Apps (Chrome, Firefox, IE)
Office 365 (Chrome, Firefox, IE) (Chrome, Firefox, IE, Safari)
Yahoo! (Chrome, Firefox, IE)