Popsize

Popsize is a Shopify app in the Product comparison category. Popsize solves one of fashion e-commerce’s biggest challenges: sizing uncertainty. By combining our proprietary AI models, real shopper profiles and brand-specific data, we deliver personalized size recommendations that reduce return rates and improve the shopping experience. Popsize can be set up in 2 minutes, integrates seamlessly with your storefront, and helps provides you with reliable size guidance directly on product pages.

Popsize offers a free plan and 3 paid plans starting at $25/month and going up to $150/month. The free plan includes 1,000 size recommendations per month. The paid plans unlock advanced features beyond what's available on the free tier.

Yes — Popsize offers a free plan alongside paid options. The free plan includes 1,000 size recommendations per month. Paid plans start at $25/month for advanced features.

Popsize launched on July 21, 2025.

Popsize does not currently carry Shopify's Built for Shopify badge. The badge is awarded to apps that meet Shopify's published standards for performance, ease of use, and merchant value — many high-quality apps operate without it.

Merchants commonly compare Popsize with Loox, Instafeed, Google Reviews by Reputon, and Reputon Customer. Each alternative covers a similar use case but differs on pricing model, integration depth, and the specific themes merchants praise in reviews — see the alternatives section above for a side-by-side.