Rules, not code
Tiered / volume discounts, Buy X Get Y, and VIP / wholesale pricing by customer tag — the patterns stores lost when Shopify Scripts shut down, rebuilt on Shopify Functions.
Now on the Shopify App StoreAdvanced automatic discounts,
Advanced automatic discounts,
tested before they go live
DiscountForge is a discount rules engine built on Shopify Functions — tiered pricing, Buy X Get Y, and customer-tag pricing, with a simulator that shows exactly why each discount does or doesn’t apply.
- Built on Shopify Functions
- No duplicate products
- No draft orders
- Clean uninstall
Try the actual engine — no install
Pick a rule, change the cart, and watch it decide. This runs the same code that runs in checkout.
−$7.50
$75.00 → $67.50 at checkout, labelled “Spend more, save more”.
Why
- No conditions — rule applies to any cart.
- Matched subtotal is 75 → tier "min 50" grants 10% off.
- Rule applies — "Spend more, save more".
Produced by simulateRule — the package the Shopify Function is compiled from.
That verdict came from the engine, not from this page. Install DiscountForge to point it at your own products.
See it in action
81 seconds. No signup.
Everything native discounts can’t do
Simulate before you activate
Run any rule against a sample cart and see exactly what checkout will do, with a line-by-line “why / why not” trace. No more guessing why a discount didn’t apply.
Set and forget
Discounts run natively inside Shopify checkout, customer tags sync automatically, and conflicting rules are flagged in plain language before they surprise you.
What the shopper actually sees
A discount nobody notices doesn’t lift the order. DiscountForge ships a theme block that puts the next reward in the cart, where the decision gets made.
- Drops into your theme as a block — no theme code to edit
- One progress bar per active rule, recalculated as the cart changes
- Amounts render in the shopper’s own currency
Simple pricing
Free
$0 forever
- 3 active rules
- All 3 rule templates
- Simulator with why-not trace
- Runs on live stores
Growth
$19 /month
- 5 active rules
- All 3 rule templates
- Simulator with why-not trace
- 14-day free trial
Scale
$49 /month
- Unlimited active rules
- All 3 rule templates
- Priority support
- 14-day free trial
Questions, answered
How is this different from native Shopify discounts?
Native discounts can’t do tiered / volume pricing, true Buy X Get Y, or VIP pricing by customer tag. DiscountForge runs those rules on Shopify Functions — natively inside checkout — and lets you simulate each one before it goes live.
Does it create duplicate products or draft orders?
No. Discounts are applied by a Shopify Function at checkout — there are no ghost products, no draft orders, and nothing that distorts your inventory or order reports.
What does the simulator actually do?
You run any rule against a sample cart and get a line-by-line “why / why not” trace showing exactly what checkout would do. You’ll know why a discount does or doesn’t apply before a customer ever sees it.
Will it slow down or break my store at peak times?
The discount logic runs inside Shopify’s own checkout as a Function, so there’s no external app call in the buy path. Conflicting rules are flagged in plain language before they can surprise you during a big sale.
What happens when I uninstall?
Your rules stop applying and the app cleans up after itself — no leftover metafields or dangling discounts on your storefront.
Already using DiscountForge?
From the blog
Free shipping thresholds on Shopify: discount, shipping rate, or both?
Shopify gives you two different tools for free shipping over $X — a discount and a $0 conditional shipping rate — and they fail differently. Which to use, the rate-cap setting everyone misreads, and why shipping discounts never stack.
Tiered and volume pricing on Shopify: a complete guide
Quantity breaks, bulk pricing, and wholesale tiers — why one native discount can only express a single tier, how faking a ladder with several discounts breaks, and how to build one that survives multi-currency checkout.
Buy X Get Y on Shopify: how BOGO discounts actually work
Why the free item is never added to the cart for you, what happens when X and Y are the same product, how uses-per-order changes the payout, and the checks to run before a sale.
Why your Shopify discounts won't combine (and how to fix it)
Two discounts that each work alone will silently refuse to stack unless both opt in. The real combination rules — classes, combinesWith, the best-discount rule — and the five defaults that look like bugs.
Migrating Shopify Scripts to Functions: a practical guide
Shopify Scripts stopped running on June 30, 2026. How to rebuild line item, shipping, and payment scripts on Shopify Functions — with or without a developer.
Build your first rule in ten minutes
DiscountForge is live on the Shopify App Store. Install it, build a rule, and simulate it against a sample cart — activate it only once the numbers match.
Install on ShopifyFree plan runs 3 rules on a live store. Upgrade when you need more.