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.
Proofy - Quickly validate and verify your email lists.
NotificationX - Best social proof and FOMO marketing solution for WordPress to increase conversion rates.
Trumail - Free email verification API
ProofGain - Supercharge your conversions with a simple social proof tool
Email List Verify - The Fastest Way to Improve Email List Deliverability and ROI