Browsers/operating systems/platforms we use for testing in Previews

Litmus runs its tests on whichever platform is most appropriate for a particular client. There are some exceptions, due to licensing constraints, where Litmus may use a slightly older or newer version of an operating system to offer better, cheaper and faster testing to our customers.

Microsoft Windows

Client Operating System
IBM Notes 9 Windows 10
IBM Notes 10 Windows 10
Lotus Notes 8.5 Windows 10
Outlook 2007 Windows 10
Outlook 2010 Windows 10
Outlook 2013 Windows 10
Outlook 2013 120 DPI Windows 10
Outlook 2016 Windows 10
Outlook 2016 120 DPI Windows 10
Outlook 2019 Windows 10
Outlook 2019 120 DPI Windows 10
Outlook 2021 Windows 10
Outlook 2021 120 DPI Windows 10
Outlook 2021 (Dark Mode) Windows 10
Outlook Office 365 Windows 10
Outlook Office 365 120 DPI Windows 10
Outlook Office 365 (Dark Mode) Windows 10
Outlook Office 365 120 DPI (Dark Mode) Windows 10
Thunderbird Windows 10
Windows 10 Mail Windows 10 version 21H2
Windows 10 Mail (Dark Mode) Windows 10 version 21H2
Windows 11 Mail Windows 11 version 21H2
Windows 11 Mail (Dark Mode) Windows 11 version 21H2

macOS

Client Operating System
Apple Mail 13 10.15 (Catalina)
Apple Mail 13 (Dark Mode) 10.15 (Catalina)
Apple Mail 14 11 (Big Sur)
Apple Mail 14 (Dark Mode) 11 (Big Sur)
Apple Mail 15 12 (Monterey)
Apple Mail 15 (Dark Mode) 12 (Monterey)
Outlook 2016 10.12.6 (Yosemite)
Outlook Office 365 10.15 (Catalina)
Outlook Office 365 (Dark Mode) 10.15 (Catalina)

Web-based email

Our web-based email client results are opened on Windows 10 machines using the following web browsers:

  • Chrome 97
  • Firefox 95
  • Microsoft Edge 97

Our Outlook.com dark mode clients are configured using the dark theme on Outlook.com rather than Windows settings. 

iOS devices

The table below shows the mobile device and its operating system. We use the native mail application included for each mobile device.

Mobile Device Operating System
iPad Retina iOS 13.1
iPad (Gen 7) iOS 13.1
iPad (Gen 7) (Dark Mode) iOS 13.1
iPad Pro (10.5, 11, and 12.9-inch models) iOS 13.1
iPad Air (Gen 4) iOS 14.2
iPhone 8 iOS 12.0
iPhone 8 plus iOS 12.0
iPhone SE iOS 14.2
iPhone SE (Gen 2) iOS 13.4.1
iPhone XS iOS 12.0
iPhone XS Max iOS 12.0
iPhone XR iOS 12.0
iPhone 11 iOS 13.1
iPhone 11 Pro iOS 13.1
iPhone 11 Pro (Dark Mode) iOS 13.1
iPhone 11 Pro Max iOS 13.1
iPhone 11 iOS 14 iOS 14.2
iPhone 11 iOS 14 (Dark Mode) iOS 14.2
iPhone 12
iOS 14.2
iPhone 12 (Dark Mode) iOS 14.2
iPhone 12 Mini iOS 14.2
iPhone 12 Mini (Dark Mode) iOS 14.2
iPhone 12 Pro Max iOS 14.2
iPhone 12 Pro Max (Dark Mode)
iOS 14.2
iPhone 13 iOS 15.0
iPhone 13 (Dark Mode) iOS 15.0
iPhone 13 Pro Max iOS 15.0
iPhone 13 Pro Max (Dark Mode) iOS 15.0

iOS apps

The table below shows the app, mobile device, and operating system.

App Mobile Device Operating System
Gmail App iPhone SE 2nd Generation iOS 14.2
Gmail App Dark iPhone SE 2nd Generation iOS 14.2
Microsoft Outlook App Version 4.2128.0 iPhone SE 2nd Generation iOS 14.2

Android devices

We currently use Gmail accounts within the following clients:

Email Client Version Device Android Version
Android Gmail App 2020.09.06.332325283 Samsung Galaxy S6 Android 6.0 (Marshmallow)
Gmail (Android 7) 2020.09.06.332325283 Google Pixel Android 7.1.1 (Nougat)
Gmail (Android 8) 2020.09.06.332325283 Google Pixel 2 Android 8 (Oreo)
Gmail (Android 9) 2020.09.06.332325283 Google Pixel 3 Android 9 (Pie)

Gmail (Android 10) 2020.09.06.332325283 Google Pixel 4 Android 10

Gmail (Android 10 Dark) 2020.09.06.332325283 Google Pixel 4 Android 10   

Gmail (Android 11) 2020.09.06.332325283 Google Pixel 5 Android 11   

Gmail (Android 11 Dark) 2020.09.06.332325283 Google Pixel 5 Android 11   

We currently use IMAP accounts within the following clients:

Email Client Version Device Android Version
Android Gmail App v. 2020.09.06.332325283 (IMAP Account Setup) 6.0 Samsung Galaxy Nexus Android 6.0 (Marshmallow)
Android 6 Email App 6.0 Samsung Galaxy S6 Android 6.0 (Marshmallow)
Samsung Mail App 6.0 Samsung Galaxy S6 Android 6.0 (Marshmallow)
Samsung Mail (Android 7) 7.1.1 Samsung Galaxy S8 Android 7.1.1 (Nougat)

We currently use Office365 accounts within the following clients:

Email Client Version Device Android Version
Microsoft Outlook 4.2147.4 Google Pixel 5 Android 11.0
Microsoft Outlook Dark 4.2147.4 Google Pixel 5 Android 11.0

Microsoft Outlook

Outlook for Microsoft Windows uses the Microsoft Word rendering engine to render emails. The table below shows the different rendering engines for the different versions of Outlook Litmus has to offer. Read more about Outlook rendering in this blog post.

Email Client Version Used
Outlook 2007 Word 2007
Outlook 2010 Word 2010
Outlook 2013 Word 2013
Outlook for Mac 2016 WebKit
Outlook 2016 Word 2016
Outlook for Mac 2019 WebKit
Outlook 2019 Word 2019
Outlook 2021 Word 2021

IBM Notes

Notes 8.5 selects its rendering engine from the operating system's installed version of Explorer. Litmus uses Internet Explorer 8 on any machine running Lotus Notes 8.5.

Screen resolution

We currently use 1366x768 resolution. PC-based desktop/webmail client and browser previews are on machines using 96 DPI unless noted.

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