Charge by percentage
Set a percentage and optional default price. The add-on amount updates automatically from eligible cart items.
Eligible subtotal×Your percentage=Add-on price
Built for Shopify Plus checkout
A simple add-on.
Right at checkout.
Offer shipping protection, donations, handling fees, or any percentage-based add-on—without making your checkout complicated.
ORDER SUMMARYTotal
$1,394.90Add Shipping Protection for $15.002% of eligible items
Affected items
The Collection Snowboard: Liquid
ONE SMALL APP
Extra revenue should not require extra complexity.
RunBySimple: Surcharge gives customers a clear choice and gives merchants precise control.
Choose what counts
Apply the add-on to every product, or use a product tag for insurance and protection offers.
Apply to all products
Keep checkout clear
Show the affected products and explain the calculation so customers know exactly what they are accepting.
AFFECTED ITEMSCollection Snowboard
SETUP
Ready in three steps.
No theme code to edit. Configure the app, add its checkout block, and publish.
- 1
Create or select an add-on product
Use an existing variant or let the app create a simple non-shipping product.
- 2
Choose your calculation
Set the percentage, eligible products, customer-facing copy, and display options.
- 3
Add the block to checkout
Place RunBySimple in the order summary so it remains visible on desktop and mobile.
SIMPLE PRICING
One plan.
Everything included.
Available for Shopify Plus stores. Start with a 7-day free trial. Development stores are free.
Simple features.
Fair prices.
RunBySimple apps do one useful job and stay out of your way.
Get early access