analyze.email might be a bit more popular than Unlayer. We know about 1 link to it since March 2021 and only 1 link to Unlayer. We are tracking product recommendations and mentions on various public social media platforms and blogs. They can help you identify which product is more popular and what people think of it.
Before that we had some luck using RazorLight, but we did all email templates in an editor Unlayer, exported the html and made a layout and view files. Source: about 1 year ago
I suggest you to check your score in : mail-tester.com and analyze.email. Source: over 1 year ago
MJML - The open source framework for responsive emails
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Stripo - Stripo is an all-in-one email design platform. We enable our clients to build emails of any complexity, including interactive AMP emails, really fast and easy.
Rename Email - Easily change the subject of any email, by cloudHQ
BeeFree.io - Bee is MailUp's drag-&-drop editor for responsive design emails.
TapText - Send canned text messages with a single tap