Rae from Shopify here. Thanks for reaching out with this question!
Fera Product Reviews App and Social Proof - The Urgency App can both be used to show how many customers are viewing your products in real time. Similarly, Nudgify Social Proof & FOMO has a 'Popularity Nudge' option that shows how many people have recently viewed specific products.
These apps are all created and fully supported by third-party developers, so if you have any questions about using these apps, or their pricing options, please reach out to the app developers directly for more information.
Are you hoping to use these apps for social proof to influence buyers? If so, I recommend checking out our blog post on this topic to learn more about the different types of social proof, and how they can be used to build valuable marketing tactics.
I'd love to hear more about any other marketing strategies you're focusing on. Let me know if you'd like to chat about this further!