PDFCrowd might be a bit more popular than PDF Reader X. We know about 1 link to it since March 2021 and only 1 link to PDF Reader X. 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 suggest that you try with a dedicated PDF viewer, I'm using Adobe Acrobat Reader DC (i.e. The "official" one) but there's a bunch out there, Foxit Reader is another that people sometimes recommend. Source: about 3 years ago
To follow on with this, I've used https://pdfcrowd.com/ too. Source: about 3 years ago
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