Discount TamarinBy RetailForge
FAQ

Discounts, drawn
not coded.

Draw the rule on a canvas. Test it against a real cart. Ship it as a Shopify Function.

See how it works
Tamarin mascot pointing forward
01

Drag to compose

Drag conditions and actions onto the canvas. Wire them like you'd describe the rule.

02

Simulate before ship

Test carts run the exact WASM your live shoppers will hit at checkout.

03

One-click deploy

Your graph compiles to a Shopify Function in one click. Roll back any time.

Frequently asked questions

When will Discount Tamarin be available?
Summer 2026 on the Shopify App Store.
Already shipping internally
  • Interpreter
  • In-builder simulator
  • Five capability variants
In progress
  • Onboarding
  • Partner review
How is this different from Shopify's native discounts?
Native discounts cover the basics. Anything custom needs a Shopify Function in Rust.
ShopifyTamarin
Percentage off✓✓
BOGO✓✓
Free shipping✓✓
BOGO scoped to one collection×✓
Tiered shipping by weight×✓
B2B company-specific pricing×✓
Conditional, stacked promos×✓
Tamarin lets you draw it. No Rust required.
What kinds of discounts can it build?
Anything Shopify Functions can express:
  • Cart-level discounts (% off or $ off)
  • Line-level rules with conditions
  • Free shipping with constraints
  • B2B company-specific pricing
  • BFCM stacks (multiple promos active at once)
Five capability variants ship. Pick one, or split across multiple discounts.
Will it slow down my checkout?
No.
Module240 KB Rust WASM
RuntimeShopify Functions sandbox
Network callsNone
Third-party serversNone
Same runtime as Shopify's own discount logic.
If something looks wrong in checkout, can I roll back?
Yes, in one click.
  • The simulator runs the exact WASM your shoppers will hit
  • Most issues surface before deploy
  • Every deploy is reversible
What makes you qualified to build merchandising tools?
A decade running merchandising for Shopify and DTC brands. We've shipped:
  • BOGOs that stacked wrong
  • Tiered shipping that broke at scale
  • B2B pricebooks that needed engineer-time
Tamarin is the tool we wished we had.

Or get in touch directly at hello@retailforge.app.