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.

We share our currently available email client previews on our Litmus site.

Microsoft Windows

Email Client Version Operating System
IBM Notes 9 9.0 Windows 10
IBM Notes 10 10.01 Windows 10
Lotus Notes 8.5 8.5.3 Windows 10
Outlook 2007 12.0.6770.5000 Windows 10
Outlook 2010 14.0.7177.5000 Windows 10
Outlook 2013 Outlook 15.0.5353.1000 MSO 15.0.5363.1000 Windows 10
Outlook 2013 120 DPI Outlook 15.0.5353.1000 MSO 15.0.5363.1000 Windows 10
Outlook 2016 Outlook 16.0.5182.1000 MSO 16.0.5188.1000 Windows 10
Outlook 2016 120 DPI Outlook 16.0.5182.1000 MSO 16.0.5188.1000 Windows 10
Outlook 2019 Version 1808 (Build 16.0.10377.20023) Windows 10
Outlook 2019 120 DPI Version 1808 (Build 16.0.10377.20023) Windows 10
Outlook 2021 16.0.14332.20102 Windows 10
Outlook 2021 120 DPI 16.0.14332.20102 Windows 10
Outlook 2021 (Dark Mode) 16.0.14332.20102 Windows 10
Outlook Office 365 Version 2303 (Build 16.016227.20202) Windows 10
Outlook Office 365 120 DPI Version 2303 (Build 16.016227.20202) Windows 10
Outlook Office 365 (Dark Mode) Version 2303 (Build 16.016227.20202) Windows 10
Outlook Office 365 120 DPI (Dark Mode) Version 2303 (Build 16.016227.20202) Windows 10
Thunderbird 60.6.1 Windows 10

macOS

Email Client Version Operating System
Apple Mail 15 15.0 12 (Monterey)
Apple Mail 15 (Dark Mode) 15.0 12 (Monterey)
Apple Mail 16 16.0 13.1 (Ventura)
Apple Mail 16 (Dark Mode) 16.0 13.1 (Ventura)
Outlook 2016 15.41 (Build 171205) 10.12.6 (Yosemite)
Outlook Office 365 16.76.1 (Build 23081800) 12.6.1 (Monterey)
Outlook Office 365 (Dark Mode) 16.76.1 (Build 23081800) 12.6.1 (Monterey)

Note: Apple Mail preview clients have Mail Privacy Protection (MPP) enabled. MPP does not impact Outlook clients on macOS.

Web-based email

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

  • Chrome 114
  • Firefox 104
  • Microsoft Edge 115

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 SE iOS 14.2
iPhone SE (Gen 2) iOS 13.4.1
iPhone 11 iOS 14.2
iPhone 11 (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
iPhone 14 iOS 16.0
iPhone 14 (Dark Mode) iOS 16.0
iPhone 14 Pro Max iOS 16.0
iPhone 14 Pro Max (Dark Mode) iOS 16.0
iPhone 15 iOS 17.0
iPhone 15 (Dark Mode) iOS 17.0
iPhone 15 Plus iOS 17.0
iPhone 15 Plus (Dark Mode) iOS 17.0
iPhone 16 iOS 18.0
iPhone 16 (Dark Mode) iOS 18.0
iPhone 16 Plus iOS 18.0
iPhone 16 Plus (Dark Mode) iOS 18.0
iPhone 16 Pro iOS 18.0
iPhone 16 Pro (Dark Mode) iOS 18.0
iPhone 16 Pro Max iOS 18.0
iPhone 16 Pro Max (Dark Mode) iOS 18.0

Note: iPhone previews on devices using iOS 15 or later have Mail Privacy Protection (MPP) enabled.

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 4.2229.0
iPhone SE 2nd Generation iOS 14.2

Android devices

We currently use Gmail accounts within the following clients:

Email Client Version Device Android Version
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   

Special Conditions

We currently use IMAP accounts within the following clients:

Email Client Version Device Android Version
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 4.2223.0 Google Pixel 5 Android 11.0
Microsoft Outlook Dark 4.2223.0 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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