Shopify apps for the cart
Three Shopify apps that show shoppers stacked discounts, real shipping rates and free gifts right in the cart, before they think about leaving.
Three apps. One job each.
By the numbers
Average rating across all three apps, weighted by reviews
Merchant reviews on the Shopify App Store
Building cart apps, continuously maintained
Ratings and review counts from the Shopify App Store, as of November 2026.
The apps
Every app solves one job on the cart page. Install one, or run all three — they share the same architecture, so they don’t collide.
Accepts discount codes right on the cart page and shows the savings before checkout. Stacks multiple codes, applies them automatically, and tracks progress toward free shipping.
Calculates real shipping rates on the cart by product, postal code, weight, dimension or distance — and detects the customer’s location automatically.
Adds free products to the cart automatically when shoppers hit the goals you set — cart value, quantity, specific products — and shows them what they’ve earned.
| App | What it solves | Price from | Rating | Built for Shopify |
|---|---|---|---|---|
| Dr Stacked Discounts on Cart | Discount codes and stacked discounts on the cart page | $4.99/month | 4.9 ★ (177 reviews) | — |
| Dr Cart Shipping Rates & Rules | Real shipping rates in the cart, before checkout | $3.99/month | 5.0 ★ (69 reviews) | Yes |
| Dr Free Gift, BOGO Buy X Get Y | Automatic free gifts and Buy X Get Y offers | $9.99/month | 4.7 ★ (99 reviews) | — |
Prices and ratings from the Shopify App Store, as of November 2026. Every paid plan starts with a 14-day free trial.
Every paid app includes a 14-day free trial and runs free on development stores — billing only starts when the store goes live.
Support
Every app installs on your own, in minutes. When something does go wrong, the team that builds the apps is the team that answers — and across all three, support is what merchants mention most in reviews.
Merchant reviews
Verified five-star reviews from the Shopify App Store, newest first.
Excellent app and outstanding customer support! The team was extremely helpful, responsive and provided a quick, effective solution to our issue. Everything works perfectly now.
Great app — easy setup and outstanding customer support. They truly take the time to help and make sure everything is perfect. A+ experience.
Wow, TOP NOTCH customer service! The response time is super fast and the detailed replies are not AI generated. Great app, and great team to support it!
A very useful app for achieving many variations of stacked discounts and also exclusions. Support is also very prompt and helpful.
Nice app, good customer service and quick response.
FAQ
Yes, with an app. Shopify can combine some discounts when each one is set to combine, but stacking several codes and showing the savings on the cart page is limited. Dr Stacked Discounts on Cart adds a discount field to the cart, lets shoppers stack multiple codes, and shows the total savings before checkout.
Install Dr Cart Shipping Rates & Rules. It calculates real shipping rates on the cart page by product, postal code, weight, dimension or distance, and detects the shopper’s location from their IP address. It also supports carrier-based rates from UPS, USPS, FedEx, Canada Post and more.
Use Dr Free Gift, BOGO Buy X Get Y. You set a goal, such as a cart value, a quantity or a specific product, and the app adds the free product to the cart as soon as the shopper reaches it. Progress bars and popups show shoppers how close they are.
Create a Buy X Get Y goal in Dr Free Gift, BOGO Buy X Get Y. Choose the product the shopper must buy and the gift they receive, and the app adds the gift to the cart automatically. You can also let shoppers pick their gift or make it optional.
Yes. All three apps are built for the cart page and share the same architecture, so they don’t collide. You can install one app or run all three on the same store, and the discount, shipping and gift messages appear together in the cart.
Plans start at $3.99/month for Dr Cart Shipping Rates & Rules, $4.99/month for Dr Stacked Discounts on Cart and $9.99/month for Dr Free Gift, BOGO Buy X Get Y. Every paid plan includes a 14-day free trial, and all apps are free on development stores.
No. Each app installs with a guided installer in minutes, with no code and no developer. If your theme needs adjustments, the Shop Doctors team handles custom theme work and fixes conflicts with your existing apps.
Show shoppers their costs and savings before checkout. Display shipping rates, applied discounts and free-gift progress on the cart page so there are no surprises at checkout. Across stores using Dr Stacked Discounts on Cart, carts with a discount code applied convert 24.5% more often.
