PDFCrowd might be a bit more popular than SendBoard for Trello. We know about 1 link to it since March 2021 and only 1 link to SendBoard for Trello. 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.
Christl from SendBoard here (makers of Email for Trello). Source: about 2 years ago
To follow on with this, I've used https://pdfcrowd.com/ too. Source: about 3 years ago
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