A Shopify post purchase upsell app should be judged by the page it can edit and by the Shopify plan you are on. SK Checkout Customizer documents a checkout upsell and a separate thank-you upsell. Shopify’s help on checkout configurations documents app blocks on the payment step as Plus, and thank-you and order-status app blocks on Basic and higher. An app that only advertises “post purchase” may be talking about the page after payment, the checkout step, or both.
SK Checkout Customizer is free. The catalog has no paid tier and no A/B test. ReConvert, now listed under Upsell.com, advertises thank-you and post-purchase offers and A/B testing on its App Store listing. On 13 October 2026 that listing excerpt and the vendor’s own marketing site did not show the same price. This article does not quote either figure. Open ReConvert (Upsell.com) on the Shopify App Store and read the price there before you compare cost.
Start with the page
Post-purchase is a muddy phrase. Merchants use it for a checkbox before the card is charged, for a one-click offer in the moment after payment, and for a product row on the thank-you page. Those are different permissions.
| Page | What to ask |
|---|---|
| Thank-you and order status | Documented for app blocks on Basic and higher. Confirm Starter separately. |
| Information, shipping, and payment | App blocks are documented as Plus. A non-Plus store should not plan a payment-step offer. |
Checkout UI extensions and Shopify Functions need a checkout extensibility context. That context is not a promise that every plan can place every offer. The checkout editor on your store is the check.
What SK Checkout Customizer documents
The thank-you upsell runs after checkout. You point it at a collection or a manual product list. It excludes products the customer just purchased, using the order’s line items. It can show more than one product in a carousel, and it can show an optional discount banner. That is the non-Plus shape: an offer on the thank-you and order-status pages, not on the payment step.
The checkout side is a different set of blocks. An order bump is one product as a checkbox under the cart lines. A checkbox upsell can apply a real Shopify discount code when checked and remove it when unchecked. Checkout upsell blocks share that checkbox upsell’s display rules: cart amounts, quantity, currency, an existing discount code, cart attributes, the cart note, specific products, vendor, a customer metafield, time of day, and day of week, combined with AND or ANY. Those checkout blocks sit on a step Shopify Help marks as Plus.
- Price of this app: free. There is no SK tier to upgrade into.
- A/B test: not in the catalog. Do not expect a variant switch.
- Thank-you source: a collection or a hand-picked list, minus items just bought.
- Checkout checkbox: a real product, on a Plus checkout step.
What a fair comparison includes
Compare the page, the plan, the way products are chosen, and whether a test tool exists. A listing that advertises A/B testing is offering a job this catalog does not do. That can be a reason to choose the other app, if you have confirmed the feature on its current listing and you are willing to pay whatever that listing shows today. It is not a reason to describe SK Checkout Customizer as having the same test.
The ReConvert listing excerpt, under the developer name Upsell.com, described thank-you and post-purchase offers and named A/B testing. Treat that as the vendor’s claim from an excerpt read on 13 October 2026, not as a full-page audit. This article does not repeat a price, a review score, or an order cap from that excerpt, because the excerpt and upsell.com disagreed on price the same day. Read the live listing for the number you will actually be billed.
Also ask what “add” means. SK’s thank-you block documents which products appear. It does not document a second card charge inside a separate post-purchase payment extension. If a competitor promises a one-click paid offer, confirm that sentence on their listing, on your plan, before you treat the two apps as the same mechanism.
A practical split for a non-Plus store
If you are not on Plus, shortlist apps by the thank-you and order-status pages only. SK Checkout Customizer can do that product row, at no app charge, without an A/B test. If your requirement is a payment-step checkbox, wait until the store is on Plus or pick a workflow that does not need that step. If your requirement is a built-in experiment, this catalog will not supply it. Budget time to read the other listing’s price yourself.
US, UK, and Canadian stores face the same page split. The plan is Shopify’s. The app fee, for SK Checkout Customizer, is zero. Every other fee belongs on the listing you open today.
Write the comparison down before you install a second app. One column is the page. One column is your Shopify plan. One column is how products are chosen: a single checkbox product, a collection, or a rule the other vendor documents. One column is whether a simultaneous test exists, which for SK Checkout Customizer it does not. Leave the price column blank until you are looking at the live App Store listing, including the ReConvert listing now shown under Upsell.com. Filling that column from memory, or from a 13 October 2026 excerpt, is how two different prices ended up in circulation. The excerpt is a reason to go look. It is not a number to publish.
Questions about post-purchase upsell apps
Is SK Checkout Customizer free on Basic and on Plus?
Yes. The app has no paid tier. Shopify’s plan still decides whether the block can sit on the payment step.
Which page should a non-Plus store use?
The thank-you and order-status pages. Payment-step app blocks are documented as Plus.
Why is there no competitor price here?
On 13 October 2026 the App Store excerpt and the vendor site did not match. Check the live listing before you compare cost.
Match the page to your plan on SK Checkout Customizer, and install SK Checkout Customizer when that page is the one you can edit.