Courses, memberships, events, and physical products — finally in the same cart. No stitching together three tools. No broken checkouts. Just one stack that works.
The problem
You sell supplements and a coaching program. Your customer checks out twice — once on Shopify, once on your course platform. Half abandon cart.
Shopify for products. Tevello for courses. A separate subscription app. A Zapier workflow held together with rubber bands. One update breaks everything.
After purchase, they get two emails from two systems. Two logins. Two dashboards. They forget the course even exists. Your completion rates tank.
The solution
Add courses, memberships, events, and digital products as native Shopify products. Bundle them with physical inventory. One cart, one checkout, one confirmation email, one login for your customer.
Built different
Products, courses, and memberships in the same cart. Shopify handles payment. CartStack handles access. Your customer gets one receipt, one login.
Native completion tracking, downloadable certificates, and student progress dashboards. Everything Inflowkit broke. Everything Tevello doesn't have.
Bundle a supplement subscription with a coaching course. Trigger upsells at checkout. Offer member-only pricing. All from one product dashboard.
Bulk participant management, automated course reminders, and event countdowns. The features merchants have been requesting on Tevello for two years.
Built on Shopify Functions, not legacy checkout.liquid. Migration-ready for the 2026 deadline. Your app won't break when Shopify updates.
Generate course outlines, write lesson descriptions, and build curriculum structure with AI. Launch your first course without a production team.
"Shopify built the world's best ecommerce platform. Then every course app made it worse by turning it into a patchwork."
We started CartStack because we were tired of watching great brands lose customers at checkout because their tools didn't talk to each other. If you sell supplements and a training program, your customer shouldn't need two accounts. If you sell events and merch, it shouldn't take three apps to run it.
CartStack exists because the hybrid merchant problem has been ignored for too long. It's not a niche. It's the future of how independent brands sell.
CartStack is being built for Shopify merchants who are done with workarounds. One storefront. One checkout. Everything in one place.