Kartra ◆
Kartra bundles landing pages, email, funnels, and course hosting into one platform with a built-in AI copywriter.

Proof Factor (Marketing & SEO): Proof Factor is a Shopify app for social proof, upsell, and email automation to boost conversions. Pricing: Free plan (from $0/mo). (data verified August 2026)
Transparency: if you buy through our links we may earn a commission, at no extra cost to you. Rankings cannot be bought. How we rate tools
Proof Factor is a social proof marketing app for Shopify stores. It displays live notifications of recent purchases and sign-ups to build trust and urgency, similar to what Orbitz, Hotels.com, and Airbnb use. The tool also includes one-click checkout upsell, gamified popups (like spin wheels), email automation, SMS marketing, and A/B testing to maximize sales.
Most website visitors never buy. Proof Factor helps you capture attention and convert more of that traffic by showing social proof signals and engaging visitors with marketing tools. It solves the problem of low conversion rates and abandoned carts by creating urgency and offering post-purchase upsells.
It's best for Shopify merchants, e-commerce businesses, and digital product sellers (like online courses) who want to increase revenue without complex coding. It's not ideal for non-Shopify users or those who need a full CRM.
A boutique apparel reseller made over $50,000 in additional sales within 30 days using spin-wheel popups, cart recovery, and post-purchase upsells. A handmade jewelry store collected 120,000 contacts and generated $13,000 of extra upsold GMV. The app has over 2,450 5-star reviews on the Shopify App Store.
Editorial score from our review methodology — not user ratings.
Proof Factor pricing: Free plan (from $0/mo). Billing model: Freemium.
Start for free with essential features like social proof notifications and basic popups. Perfect for new stores.
Upgrade to access advanced features like email automation, SMS, post-purchase upsells, and A/B testing. Pricing is tiered based on features and usage, but exact prices are not listed on the homepage. Contact Proof Factor for a quote.
All paid plans typically come with a free trial so you can test before buying.