PDFCrowd might be a bit more popular than SmartMetrics. We know about 1 link to it since March 2021 and only 1 link to SmartMetrics. 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.
Please check https://smartmetrics.com, low project rates. Source: almost 3 years ago
To follow on with this, I've used https://pdfcrowd.com/ too. Source: about 3 years ago
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