Surcharge
$9.99USD
per month
per month
Or US$99 per year
- Percentage-based checkout add-ons
- All-product or tag-based eligibility
- Customer-facing copy and display controls
No usage fees. Cancel anytime.
RunBySimple: Surcharge · Available on Shopify
A simple add-on.
Right at checkout.
Offer shipping protection, donations, handling fees, or other percentage-based add-ons with a clear choice for your customers.
Install on ShopifyFor Shopify Plus checkout.
Your add-on. Your calculation.
Create or select an add-on product, set your percentage and eligibility, then add the app block in the Checkout Editor. Enable the cart cleanup app embed in the Theme Editor and test your published configuration.
Choose all products or tag-based eligibility, and control the customer-facing copy. The fee updates from eligible cart items.
Subscription apps with contract-editing workflows, such as Stay AI, can add the product to recurring orders through automation configured outside RunBySimple: Surcharge. The fee does not automatically recalculate when a subscription total changes.
- Percentage-based fees
- Set a percentage and optional default price for the add-on product.
- Product eligibility
- Apply the add-on to all products or limit it to products with a chosen tag.
- Clear checkout choices
- Show affected products and explain the calculation so customers can review the add-on.
One simple plan.
For Shopify Plus stores. Start with a 7-day free trial. Development stores are free.
Each RunBySimple app has a separate subscription.