Castore powers performance of social proof by adding to PLP to deliver 2.07% CVR uplift

In November 2025, at the height of peak trading, Castore went live with its first test of Taggstar’s social proof messaging, having witnessed its power for other well-known brands. The company wanted to drive conversion of its own brand range and to increase Average Order Value (AOV). 

It opted for Taggstar’s Social Proof Pro Plan, targeted to growing businesses, across its PDP and cart and witnessed a 1.51% conversion rate uplift in only 15 days and an annual ROI of 1,634%.  

Its most recent experiment, which took place in the first quarter of 2026, sought to assess the value of adding Taggstar’s social proof messaging to its PLP to further improve conversion of its own brand range and better support customers by guiding them through list pages and aiding product discovery.

The new experiment delivered an additional 2.07% conversion rate uplift on the initial 1.51% increase already witnessed in the previous test. This generated a further £30,933 in incremental revenue over the 45-day test period.

Kirsty Ashworth, Head of eCommerce at Castore, says: “After the great results of the first test, it was a natural progression for us to launch social proof messaging on the PLP.”

“Once again, the speed of implementation has impressed us. Taggstar offers great service and responds quickly, allowing us to maintain the momentum of our testing and success. Everything’s very smooth and very quick. Most importantly, it’s clear that Taggstar understands our brand and what we are trying to offer as a company.” 

“The Social Proof Pro Plan from Taggstar has delivered great value in driving conversion and sales for our business, and the results from the addition of social proof to the PLP have been even more impressive than the additional test, beating our expectations. We intend to continue to build on our optimisation of social proof by exploring more tests as part of this partnership.”