UpsellKit is the all-in-one upsell platform for BigCommerce. Pre-purchase cart-drawer offers, post-purchase one-click upsells on the order confirmation page, AND a drag-and-drop thank-you page builder — one install covers the entire merchant journey from cart to confirmation, without touching theme files.

What you get:

• Drag-and-drop thank-you page builder — 16 block types (upsell offers, product recommendations, countdown timers, discount codes, surveys, birthday collectors, order tracking, referral), multi-column rows, branded templates, mobile preview.

• Post-purchase one-click upsell — for logged-in customers with a stored card, charges the saved card via BigCommerce Payments with an inline CVV mini-checkout (no redirect, no re-entered card). Guest checkouts fall back to a redirect-to-cart flow with the upsell + discount pre-applied.

• Cart-drawer upsell — slides in when a shopper adds to cart. Configure your upsell products, variant selectors, and quantity steppers. Pro plans unlock an auto-applied bundle discount via BigCommerce V3 Promotions.

• Free-shipping progress bar + exit-intent popup — two extra pre-purchase surfaces, rendered inside a Shadow DOM so they never conflict with your theme CSS.

• Per-storefront analytics — funnel view (impressions → clicks → accepted → completed), revenue attribution per trigger, multi-storefront (MSF) aware so B2B and B2C each tell their own story.

• Auto-applied discounts with zero coupon management (Pro+) — create an offer with a percentage or fixed discount, UpsellKit provisions a BigCommerce V3 Promotion automatically so the discount hits the customer's cart without a code to enter.

How it works: install in one click, sync your products, build your first thank-you page from a template, enable the cart drawer with your chosen upsell products, and watch the funnel fill up on the dashboard. No theme edits. No developer required.

Languages: widgets ship in English, French, Spanish, German, Italian, Portuguese, and Dutch. Per-channel language override for multi-region stores.

Pricing: Free tier forever for the thank-you page builder + 8 brand blocks. Paid plans from $19/mo scale with monthly widget impressions.

Install UpsellKit and start converting more on the pages you already own.