Sink FAQs

Sink — Push Down Out of Stock (a Shopify app by Xeon Apps) automatically moves sold-out products to the bottom of your collections and keeps the in-stock products above them sorted by a rule you choose — Best selling, Product title, Price, and more. Shoppers always see what they can actually buy first. The full story is on the Sink page.

No. Sink works at the collection level, not the theme level — it reorders the collection's actual product order through Shopify's API. There are no Liquid edits, no app embeds, no scripts on your storefront, and nothing to re-apply when you change themes.

All of them — free themes like Dawn, paid themes, and custom builds. Because Sink changes the collection's real sort order in Shopify rather than manipulating the page, every surface that renders the collection shows the same order.

Yes — both automated (smart) collections and manual (custom) collections. You enable push-down per collection and pick a sorting rule for each one.

A few minutes: install, open a collection in Sink, enable push-down, pick a sorting rule, and optionally adjust the sold-out definition and exclusions in settings. Our step-by-step guide walks through it.

When you enable push-down, Sink sets the collection's sort order to Manual in Shopify — saving your original sort order first — and then continuously rearranges the products: in-stock items follow your chosen rule, sold-out items sit at the bottom. How Shopify's sort orders work.

Best selling, Product title A–Z, Product title Z–A, Highest price, Lowest price, Newest, Oldest, Manually, and Most relevant (Shopify's newest sort order). The rule applies to your in-stock products; sold-out products go below them regardless of rule.

No. Sink records the sort order the collection had before it took over. Disable push-down for that collection and Sink restores it exactly.

In real time — Sink listens to Shopify's product and collection webhooks, so a sellout or restock is typically reflected on your storefront within a couple of minutes.

Sink sorts up to 11,000 products per collection, on every plan. Larger collections can still be managed; products beyond that limit simply aren't repositioned.

It moves back up automatically and rejoins your chosen sort order — you never have to remember it. Supplier deliveries, customer returns, inventory corrections, and transfers all count. How restock repositioning works.

No — that's the point of the automation. If you ever want to force an immediate refresh, re-saving the collection's sorting rule in Sink triggers a fresh sort.

Your choice of three definitions: all variants unavailable for sale; all variants unavailable at locations that fulfil online orders; or all variants unavailable at specific locations you pick. Multi-location stores can match the definition to the warehouse that actually serves their online store.

Yes, two ways. Products set to "Continue selling when out of stock" can be left in place — they're backorderable on purpose, so shoppers can still buy them. And you can exclude products matching conditions you define (such as specific tags); they stay in the regular sort order even when sold out.

Untracked products are treated as always in stock and are never pushed down — there's no meaningful "sold out" state for them. Enable "Track quantity" on their variants if you want Sink to manage them.

Everything — real-time push-down, every sorting rule, unlimited products — for up to 5 managed collections. It's a real free plan, not a trial.

Only more collections. Basic ($2.99/mo) manages up to 25, Advance ($7.99/mo) up to 100, and Unlimited ($19.99/mo) has no cap. Every plan includes unlimited products and all sorting rules — Sink never charges by catalogue size.

No. Most competing apps gate their plans by product count; Sink gates only by managed collections. A 50,000-product store pays the same as a 500-product store with the same number of collections. See the comparison.

No — push-down is the SEO-safest way to handle sold-out products. Pages stay published, URLs keep working, backlinks keep their value, and Google's index is untouched; only the position within the collection changes. Hiding products, by contrast, unpublishes their pages. Push down vs. hide, compared.

Push down what will restock; hide what won't. Restocking products keep their page, ranking, and demand signals while out of the way at the bottom. Discontinued products are better unpublished — our Blink app handles that, and VarHide covers individual sold-out variants.

The usual causes, in order of likelihood: push-down isn't enabled for that collection; the product is set to "Continue selling when out of stock"; your exclusion conditions match it; its inventory isn't tracked; it still counts as in stock under your sold-out definition (for example, stock remains at a location you're not checking); the change hasn't propagated yet; or a shopper picked a different option in your theme's sort dropdown, which overrides the default order. Our troubleshooting checklist walks through each with fixes.

That's Sink working as designed — Manual is the only sort order that allows a custom product arrangement, so Sink switches the collection to it and then maintains the order for you. Your previous sort order is saved and restored if you disable push-down.

No — when a shopper actively chooses "Price, low to high" or another option, Shopify re-sorts the page by that key, and sold-out items mix back in. Sink controls the collection's default order, which is what the overwhelming majority of shoppers browse with.

Email support@xeonapp.com or reach us through the App Store listing. Including the collection name and an example product speeds everything up.