Changelog
New features, improvements, and fixes for TackOn. Have a request? Let us know.
Fees stay on returning checkouts
If a customer reached checkout, went back to your store (or had it open in another tab), and then returned, the fee could drop off their order. The fee now stays in the cart and on that checkout, on every theme.
Add the charge as soon as it applies
A new Behavior setting adds the fee to the cart as soon as the cart qualifies, instead of when the customer clicks Check out. Useful for required charges on checkouts customers reach without that button, such as a saved checkout link. Optional charges are still only added after the customer turns the toggle on.
Required & Default-On Fees →Fee line corrects itself in the cart
If the fee line's quantity is changed or it's duplicated, TackOn puts it back to a single line at the right amount, and removes it when the cart has no other products.
No second widget when changing quantities
On some themes and cart apps, changing an item's quantity could show the fee widget twice. It now appears once.
Weight-based fee tiers
Band a fee by cart or item weight as well as by price, for example a higher handling fee on heavy orders. A {{weight}} placeholder shows customers the weight the fee was based on, and TackOn warns you about products with no weight set.
Fee tiers guide →Fee opt-in at checkout (Shopify Plus)
Stores on Shopify Plus can show the fee opt-in on the checkout page itself, styled to match the cart widget and configured from TackOn's settings.
Switch plans and redeem discount codes
Move back to the free plan from the Billing page, with the paid plan prorated, and redeem a TackOn discount code there too.
Pricing overview →Theme changes keep the widget in place
When you edit or publish a theme, TackOn re-syncs where the widget sits in your cart automatically, and setup now detects the app embed more reliably.
Clearer setup warnings
Settings now warn when the customer toggle is turned off, and the checkout editor explains why the checkout widget is hidden on stores that can't use it.
Test and trial orders don't count toward billing
Orders placed with a test gateway or during your free trial are no longer counted as billable usage.
Price-tier gaps flagged, combined fees per tier
The rules editor warns when your price tiers leave a gap where no fee would apply, and each tier can now use a combined percentage-plus-fixed fee.
Smarter charge-rule health checks
The dashboard now clearly flags when no charge rule is active, and correctly recognizes scheduled and seasonal rules instead of mistaking them for broken ones.
Fee product is now non-shippable
The behind-the-scenes fee product is created as non-shippable, so it never interferes with your shipping rates or calculations.
Product-only stores charge correctly
Stores that use only product-specific rules (no catalog-wide default) now apply fees reliably at checkout.
Consistent rule state in the widget
The cart widget now honors each rule's active state consistently for both the fee amount and whether the widget is shown.
Date scheduling for fees
Run a fee only when you want it: a one-time date range, a recurring yearly window, specific months, or specific days of the week. Ideal for seasonal, holiday, or weekend surcharges. When a schedule is off, the widget hides itself and no fee is added.
Date Scheduling guide →UpCart cart drawer support
The TackOn widget now renders inside the UpCart cart drawer, so stores using UpCart can offer fees in their slide-out cart.
More reliable checkout detection
Improved checkout-target resolution so the fee and 'proceed to checkout' flow behave consistently across themes.
Shopify Admin API 2026-04
Upgraded to the latest Shopify Admin API version for ongoing compatibility and reliability.
Analytics dashboard
See fee orders, fee revenue, and average order value at a glance, plus a widget funnel showing how often the widget is shown and how often customers accept the fee, over 7, 30, 90, or 365 days.
Shadow DOM theme support
The widget now works on themes that render the cart inside a shadow DOM, expanding compatibility across more Online Store 2.0 themes.
Custom cart selectors
Point the widget at custom cart, subtotal, and checkout selectors. TackOn automatically restores your theme when you disable them.
No more duplicate widgets
Rendering now tracks claimed cart locations so the widget never appears twice on complex cart layouts.
Clearer onboarding
A refreshed setup guide, welcome banner, and setup warnings make first-time configuration faster and easier to follow.
Polished opt-in checkbox
Cleaner checkbox styling with improved focus states for better accessibility.
Updated support contact
Reach the team any time at hello@usenormalize.com.
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