Based on our record, Proof seems to be more popular. It has been mentiond 1 time since March 2021. 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've used https://useproof.com/ before, and it worked really well, and increased conversions about 8%. Source: over 2 years ago
Fomo - Fomo turns your site into the online equivalent of a busy store
Camelcamelcamel - Easily monitor Amazon product prices and get alerts when they drop.
Nudgify - Nudgify is a Social Proof App that includes FOMO, Urgency and Review Nudges. Adding Social Proof notifications to your site helps you build trust and increase conversions on Shopify, Wordpress or any other platform.
Fetchee - Fetchee is a free price tracking wish list app that works with all online stores worldwide.
Picreel - Recover abandoning visitors and turn them into customers
Keepa - Price history charts and the option to be alerted on price drops for all Amazon sites.