Privy

Privy specializes in on-site popups, banners, and signup forms for online stores, with exit-intent technology that catches visitors before they leave. Its spin-to-win wheel gamifies email capture and typically boosts signup rates, and everything connects directly to Shopify and Klaviyo so new subscribers flow straight into your lists and automations.

The focus is strictly on ecommerce, so if you're running a Shopify store looking to grow your email list, the integrations and exit-intent features pay for themselves quickly. It's less versatile for non-ecommerce use cases, but excels at what it was built for.