Email on Acid

Email on Acid is an email testing and optimization platform designed for email marketers, developers, and agencies. It allows users to preview how email campaigns render across dozens of email clients, devices, and operating systems before sending. The platform includes tools for checking spam filter placement, validating links and images, and reviewing accessibility compliance. It also offers proofing and approval workflows that let teams collaborate on email content and catch errors prior to deployment. Marketing teams and ESPs use the service to reduce rendering issues and improve deliverability across their email campaigns.