PDFCrowd might be a bit more popular than Letsfind. We know about 1 link to it since March 2021 and only 1 link to Letsfind. 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.
This (https://letsfind.app/) would've been perfect but I don't see an option to let you lock the vote to only one option. Source: about 2 years ago
To follow on with this, I've used https://pdfcrowd.com/ too. Source: over 3 years ago
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