HEML might be a bit more popular than MJML App. We know about 1 link to it since March 2021 and only 1 link to MJML App. 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.
Check out the MJML framework: https://mjmlio.github.io/mjml-app/. Source: over 2 years ago
You should take a look at https://heml.io/. - Source: Hacker News / almost 3 years ago
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