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I want to promote products from Amazon. I want to promote products that are in demand. Looking at Amazon bestsellers list I saw customer reviews that are hours old.

Is there software that will tell me how many reviews there are based on a daily/weekly basis?

For example. Some products have customer comments that are 2,4,6,8 hours old.
Some products have comments that are 2,4,6,8 days old.

Is there software that will give me this information?

My thoughts are that if a product has quite a few good recent reviews then this would help me to decide what product to promote.

Imagine typing in a product name and seeing how many recent reviews there are.....
Not many recent reviews......not a hot seller
Lots of recent reviews.....hot seller.

You state that, "...I saw customer reviews that are hours old."

Be careful with reviews because people are buying Amazon reviews just as they are buying Fiverr reviews, Youtube likes, fb likes, etc. If you want accurate data on what are Amazon bestSELLERS they subscribe to JungleScout.

Never trust reviews or testimonials.