Email on Acid provides email testing, troubleshooting and tracking tools to help you simplify and improve your email marketing efforts. Its innovative suite of tools allows you to preview emails in 41 different email clients and devices, diagnose and solve deliverability issues and access the most comprehensive email analytics available. – EmailTesting: Its comprehensive testing suite allows you to see exactly how your email will look in 41 different email clients and mobile devices so you can fix any rendering issues before you hit send.