Unlayer might be a bit more popular than HEML. We know about 1 link to it since March 2021 and only 1 link to HEML. 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.
You should take a look at https://heml.io/. - Source: Hacker News / almost 3 years ago
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: 12 months ago
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