WhenAvailable might be a bit more popular than Clara. We know about 1 link to it since March 2021 and only 1 link to Clara. 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.
Seems like I'm about 5 years late to the party, because Clara labs does exactly this; https://claralabs.com/. Source: about 1 year ago
No pdfs involved but this site might be useful to you. They have a free and paid tier. When Available. Source: over 2 years ago
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