Attach might be a bit more popular than Ludus. We know about 1 link to it since March 2021 and only 1 link to Ludus. 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.
I would go full text-mode (Markdown), Keynote or Ludus[1] [1]: https://ludus.one/. - Source: Hacker News / over 1 year ago
Embedd a product 2 page short pdf into the email and track with attach.io? Source: almost 2 years ago
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