> ## Documentation Index > Fetch the complete documentation index at: https://docs.vortexiq.ai/llms.txt > Use this file to discover all available pages before exploring further. # Catalogue Drift vs Amazon, Shopify > SKUs that diverge between Shopify and Amazon. Brand-trust killer + de-listing risk under MAP policies. How to read it, why it matters, and how to act on it. **Metrics type:** [Cross-Platform Metrics](/nerve-centre/overview#metrics-types-explained) • **Category:** [Ecommerce Platform](/nerve-centre/connectors#connectors-by-type) > SKUs that diverge between Shopify and Amazon. Brand-trust killer + de-listing risk under MAP policies. ## At a glance > A live count of SKUs whose Shopify listing diverges materially from the same SKU's Amazon listing, on price (>20% gap), title (mismatch beyond minor wording), or stock status. Brand-trust killer + de-listing risk under MAP / RPM policies + a tax / regulatory red flag in regulated categories. | | | | ----------------------------------- | ----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- | | **What it counts** | SKUs (matched by `gtin` / `mpn` / `productHandle`) where ANY of: `\|shopify_price - amazon_price\| / shopify_price > 0.20`, OR title strings have edit-distance > 30 after normalisation, OR stock states are inconsistent (Shopify in-stock + Amazon OOS or vice versa). | | **What "drift" means specifically** | Three flavours: (1) Price drift, the same SKU sells at different prices on the two platforms; (2) Title drift, the listing copy is different (one platform has the new product name, the other still has the old one); (3) Stock drift, one platform shows in-stock, the other shows OOS. | | **MAP policy implications** | Many brands operate under Manufacturer's Advertised Price (MAP) or Retail Price Maintenance (RPM) policies. Selling below MAP on one platform while honouring MAP on the other is a contract breach with the manufacturer. This card surfaces the breach automatically. | | **VAT / tax treatment** | Both sides honour their platform's tax convention. UK Shopify (`taxesIncluded = true`) compared to amazon.co.uk (also tax-inclusive) is fair. US Shopify (`taxesIncluded = false`) compared to amazon.com (also ex-tax) is fair. Cross-region comparisons are not. | | **Shipping** | NOT included in the price comparison. Shopify `totalPrice` includes shipping but the catalogue *price* is the per-unit list price; this card uses the list price field, not the order total. | | **Discounts** | List price compared, not promotional / coupon price. A short-term sale on Amazon doesn't trip the card unless the *list price* changed. | | **Refunds** | Not applicable, this is a catalogue-data card not an orders card. | | **Cancelled / voided orders** | Not applicable. | | **Currency** | Same-region only. UK Shopify GBP vs amazon.co.uk GBP is fair. US Shopify USD vs amazon.co.uk GBP is NOT compared (the connector skips cross-currency pairs to avoid false positives). | | **Channels / sources** | Shopify side compares against the active product listing across all sales channels (storefront price). Amazon side compares against the Buy Box price, not third-party seller prices. | | **Match coverage** | Approximately 85 to 95% of SKUs match cleanly via `gtin`. Brands without GTINs / EANs / UPCs (white-label, custom, drop-ship) match by `productHandle` which is less reliable. Unmatched SKUs are listed in the card's "match-failed" tab. | | **Time window** | `RT` (real-time, recomputed every 60 minutes from the latest Shopify and Amazon catalogue snapshots) | | **Alert trigger** | `>5 SKUs drifted (>20% price OR title mismatch)`, drifted SKUs above the threshold trigger the alert. Configurable. | | **Roles** | owner, marketing, operations | ## Calculation Calculated automatically from your Shopify data. See the At a glance summary above for what the metric tracks and the worked example below for a typical reading. ## Worked example A US homewares brand on Shopify Plus + amazon.com (FBA). 1,240 active SKUs across both. Reading taken on 12 Apr 26. | Drift type | SKU count | Note | | --------------------------------------------- | --------- | --------------------------------------------------------------------------- | | Price drift >20% (Amazon LOWER than Shopify) | 14 | The brand's most recent Shopify price-rise hasn't propagated to Amazon | | Price drift >20% (Amazon HIGHER than Shopify) | 3 | Amazon's algorithmic repricer pushed prices up after a competitor delisted | | Title drift | 7 | Rebranded SKUs (new wording) only updated on Shopify, Amazon listings stale | | Stock drift (Shopify in-stock, Amazon OOS) | 22 | Amazon FBA inventory ran out, Shopify still selling from own warehouse | | Stock drift (Shopify OOS, Amazon in-stock) | 5 | Brand sold out on Shopify, Amazon FBA still has units | | **Total drifted SKUs (this card)** | **51** | | The card reads **51 drifted SKUs**, well above the >5 alert threshold. Six things to notice: 1. **The 14 "Amazon lower than Shopify" is the MAP / RPM risk.** If this brand has a manufacturer agreement with MAP pricing, customers buying via Amazon at the lower price triggers a contract breach. Some manufacturers will revoke distribution rights for repeat offences. The drift may not be the brand's fault (Amazon's repricer chasing competitors) but the contractual liability sits with the seller. 2. **The 22 "Shopify in-stock, Amazon OOS" creates a bad customer-journey.** A customer who saw a Meta ad, clicked through to Amazon (because Amazon was their search default), found OOS, and gave up. They might have bought from Shopify if directed there. Pair with [Active Ads on Out-of-Stock SKUs](/nerve-centre/kpi-cards/shopify/active-ads-on-out-of-stock-skus) to find the wasted ad spend on the Amazon side. 3. **The 5 "Shopify OOS, Amazon in-stock" is the worse oversell risk.** Customers buying on Shopify when only Amazon has stock will face cancellation or delay, customer-trust hit on the brand's primary channel. 4. **Title drift is the brand-equity issue.** When the same SKU has different titles on Shopify ("Premium Linen Throw, Sage") vs Amazon ("Linen Throw Blanket Green Premium 100% European Linen"), customers second-guess whether it's the same product. Conversion suffers and review ratings on Amazon don't transfer to Shopify reviews. 5. **The fix-cadence is uneven.** Shopify is the "source of truth" for most brands; Amazon listing updates require Amazon's slow approval workflow (24 to 72 hours for content changes). So drift naturally accumulates after every Shopify price update, then flushes when the merchant manually pushes to Amazon. 6. **Auto-sync apps reduce but don't eliminate.** Codisto, Shopify's Amazon sales channel, and CedCommerce all sync prices and content automatically. They cut drift by 70 to 90% but don't catch every case (custom Amazon listings, A+ content overrides, repricer interference). The card surfaces what auto-sync misses. ## Sibling cards merchants should reference together Catalogue drift is a hygiene card. Pair these to triage and prevent: | Card | Why pair it with Catalogue Drift | | ------------------------------------------------------------------------------------------------------ | ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- | | [Marketplace Revenue Share (Amazon)](/nerve-centre/kpi-cards/shopify/marketplace-revenue-share) | The strategy context. High Amazon share + high drift = compound brand-control risk. | | [Active Ads on Out-of-Stock SKUs](/nerve-centre/kpi-cards/shopify/active-ads-on-out-of-stock-skus) | Stock drift (the OOS-on-one-side variant) directly drives ad waste. Pair to find the most expensive drift cases. | | [Products with Zero/Negative Stock](/nerve-centre/kpi-cards/shopify/products-with-zero-negative-stock) | The Shopify side of the stock-drift inputs. | | [Top Products by Revenue](/nerve-centre/kpi-cards/shopify/top-products-by-revenue) | A drifted SKU in your top-10 by revenue is more urgent than one in the long tail. Sort by Shopify revenue, fix top first. | | [Missing SEO Titles](/nerve-centre/kpi-cards/shopify/missing-seo-title-count) | Title drift often correlates with missing or stale SEO titles. Brands that haven't curated SEO usually have stale Amazon listings too. | | [Missing Descriptions](/nerve-centre/kpi-cards/shopify/products-missing-description) | Same logic, content hygiene predicts marketplace-listing hygiene. | | [Refund Rate](/nerve-centre/kpi-cards/shopify/refund-rate) | Title / description drift drives expectation gaps. Customers buying based on Amazon's stale title get a different product than expected, refund rate climbs. | | [Product Status](/nerve-centre/kpi-cards/shopify/product-status) | If a Shopify product is `ARCHIVED` but the Amazon listing is still active, that's a special case of stock drift, the brand is selling on Amazon what it considers discontinued. | ## Reconciling against the vendor's own dashboard **Where to look in Shopify Admin:** Shopify Admin can't surface this directly, it has no live link to Amazon catalogue data. The closest manual reconstruction is: * [Shopify Products](https://admin.shopify.com/products) → export the catalogue. * Amazon Seller Central → *Inventory → Manage All Inventory* → export the catalogue. * VLOOKUP / merge in spreadsheet software, manually flag SKUs where price difference > 20% or titles differ. This is the manual workflow most brands use today; it takes 2 to 4 hours per audit and is typically done quarterly. This card automates it continuously. Other views that *look* related but aren't the same: * **Shopify Amazon Sales Channel app**: shows sync status of Shopify→Amazon listings but doesn't surface drift after sync (e.g. when Amazon's repricer overrides). Surfaces the act of pushing, not the resulting state. * **Codisto / CedCommerce dashboards**: similar to the Amazon channel app, focused on sync status not drift detection. * **Amazon Brand Registry → Brand Health**: shows hijacker / counterfeit issues, distinct from authorised-listing drift. * **Amazon Reports → Manage Pricing**: shows which of your prices are uncompetitive vs Buy Box. Useful for repricer tuning; doesn't reconcile against Shopify. **Why our number may legitimately differ from a manual audit:** | Reason | Direction | Why | | --------------------------------- | ----------------------------- | ---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- | | **SKU matching gaps** | Ours lower (underestimate) | The card matches by `gtin` / `mpn` / `productHandle`. Brands without GTINs (custom, white-label) match less reliably; SKUs that fail to match silently aren't checked for drift. The "match-failed" tab on the card shows these, treat as additional risk. | | **Title-similarity threshold** | Either, calibration-dependent | Edit-distance > 30 catches material differences but ignores word-order differences ("Premium Linen Throw Sage" vs "Sage Premium Linen Throw" looks similar by edit-distance). The threshold is configurable. | | **Amazon Buy Box vs all sellers** | Ours uses Buy Box only | If you have third-party sellers competing on your listing, this card compares your Shopify price to your own Amazon Buy Box price (when you have it). When you don't own Buy Box, the comparison silently skips, masking the worst MAP-violation cases. | | **Sync lag** | Either, transient | Catalogue snapshots refresh every 60 minutes. A price change made in the last hour may not be reflected. | | **Variant-vs-product matching** | Ours sometimes false-positive | Some SKUs in Shopify are variants of a parent product; Amazon may list them as separate products. Same physical SKU, different listing ID. The card matches via GTIN where possible but can over-flag in edge cases. | **Cross-connector reconciliation:** This card IS a cross-connector data-quality check. The relationships: | Card | Expected relationship | What causes legitimate divergence | | ------------------------------------------------------------------------------------------ | ------------------------------------- | ---------------------------------------------------------------------------------------------------------------- | | [`amazon_sp.amazon_listing_health`](/nerve-centre/amazon_sp/amazon_listing_health) | Amazon-internal listing-quality score | If Amazon's listing health is poor AND drift is high, the brand needs both Amazon-side and cross-platform fixes. | | [`shopify.product_status`](/nerve-centre/kpi-cards/shopify/product-status) | The Shopify-side authoritative state | A Shopify `ARCHIVED` SKU still active on Amazon is a special drift case. | | [`shopify_xc_ads_on_oos`](/nerve-centre/kpi-cards/shopify/active-ads-on-out-of-stock-skus) | Stock-drift overlaps with ad-waste | A SKU OOS on Amazon but in-stock on Shopify, with active Amazon Ads, double waste. | | [`amazon_ads.amazon_total_spend`](/nerve-centre/amazon_ads/amazon_total_spend) | Cost amplifier | Drift on top-spend SKUs is more financially material than drift on low-spend ones. | ***
Same-metric documentation cross-reference (for agencies running multiple platforms) The same catalogue-drift pattern lives on other commerce platforms. This is **not a reconciliation**, your Shopify store doesn't have a parallel store on BigCommerce or Adobe Commerce. These cross-links exist so agencies running multi-platform client books can navigate between identical alert definitions. * [`bigcommerce.bigcommerce_xc_catalogue_drift`](/nerve-centre/bigcommerce/bigcommerce_xc_catalogue_drift) * [`adobe_commerce.adobe_commerce_xc_catalogue_drift`](/nerve-centre/adobe_commerce/adobe_commerce_xc_catalogue_drift)
## Known limitations / merchant FAQs **Why is the card showing zero or N/A?** Three causes: 1. **Amazon SP-API connector isn't connected.** The card requires both Shopify and Amazon connections. Connect in *Settings → Connectors → Amazon SP-API*. 2. **No SKUs are matching across the two catalogues.** If your Shopify catalogue and Amazon catalogue use entirely different SKU naming and there are no GTINs / EANs on either side, the matcher can't pair them. Check the "match-failed" tab on the card; if it shows your full catalogue, the matcher needs reconfiguration in *Settings → Connectors → Amazon SP-API → SKU mapping*. 3. **Catalogues are perfectly synced.** Rare but possible if you use Codisto or the official Amazon channel app and update Shopify-only. **Why is my count rising every Monday morning?** Because the brand probably ran a price update over the weekend (most retail price changes happen Sunday evening to ready Monday's stock). The Shopify side updated; the Amazon side is on Amazon's slow approval workflow which takes 24 to 72 hours. The Monday spike is structural and resolves by Wednesday for most brands. To eliminate, push the Shopify-side change AND the Amazon-side change simultaneously via the Amazon channel app. **Is title drift always a problem?** **Almost always, yes.** Differences in product titles between Shopify and Amazon hurt search ranking on both platforms (Amazon's A9 algorithm rewards keyword consistency; Google's Shopping ranking rewards consistency between Shopify metadata and ad copy), confuse customers (same product, different name?), and break review-import flows where Amazon reviews can't be tied to Shopify products via fuzzy match. The exception is regulated categories (supplements, beauty, electronics) where Amazon's compliance content rules force a slightly different format, in those cases, configure the title-similarity threshold higher in *Settings → Card → Catalogue Drift*. **Why does the card flag price drift on items I deliberately price differently?** Some brands legitimately price higher on Amazon to recover Amazon's referral fee (15% of revenue), so a 15 to 18% price uplift is a strategic choice not a drift. The card uses a 20% threshold by default to allow for this; configure higher (e.g. 25 to 30%) if your brand intentionally runs Amazon at premium pricing. Check that this aligns with your MAP / RPM agreements with manufacturers, the contractual ceiling is usually 5 to 15% above MAP not 25%. **Does the card include third-party sellers on my Amazon listings?** **No.** The card uses the *Buy Box* price as the Amazon-side comparator. Third-party sellers competing on your ASIN don't affect this card unless they win the Buy Box (in which case the price comparator becomes their price, often a MAP violator and worth a separate hijacker / counterfeit investigation via Amazon Brand Registry). **Multi-region: does the card compare US Shopify against amazon.co.uk?** **No.** The card skips cross-currency / cross-region pairs to avoid false positives from FX. For a multi-region brand, the card produces per-region drift figures (US Shopify vs amazon.com, UK Shopify vs amazon.co.uk). If either region is missing on either platform, that pair is silently skipped. **My brand has different SKU naming on the two platforms. Can I still get drift detection?** Yes if you have GTINs (EANs / UPCs / ISBNs) on both sides; the matcher uses GTIN before falling back to other fields. If you have neither GTIN nor consistent SKU naming, configure a custom mapping table in *Settings → Connectors → Amazon SP-API → SKU mapping*. This is often a one-time setup of an hour or two for brands with up to 1,000 SKUs. **The alert is at >5 drifted SKUs. Is that the right threshold?** For brands with 100 to 500 SKUs, yes, more than 5 active drifts is a real issue. For brands with 5,000+ SKUs, the threshold should sit higher (20 to 50) because some background drift level is structural. For high-MAP-risk categories (supplements, electronics, branded fashion under MAP), the threshold should sit lower (1 to 3) because each drift case has contractual and de-listing implications. **Action playbook when this card alerts:** 1. Sort the drift list by Shopify revenue (highest first). Top SKUs cost the most. 2. For price drifts: decide if the gap is intentional (premium-pricing strategy) or accidental (Amazon repricer, missed sync). Fix or accept per case. 3. For MAP / RPM violations: fix immediately. Update Amazon price to MAP, document the breach in case the manufacturer audits. 4. For title drift: pick the canonical title (usually the latest Shopify title). Push to Amazon via the channel app. Allow 24 to 72 hours for Amazon's editorial review. 5. For stock drift (Shopify in-stock, Amazon OOS): check FBA inbound shipments. If short-term, accept and let restock close it. If long-term, consider switching the SKU to FBM via Amazon Multi-Channel Fulfillment. 6. For stock drift (Shopify OOS, Amazon in-stock): pause Shopify-side ads on the SKU; the Amazon listing carries the demand until Shopify restocks. 7. Set up auto-sync in Codisto or the Amazon channel app to prevent recurrence. The card surfaces what auto-sync misses; fewer manual fixes are needed once auto-sync is running. *** ### Tracked live in Vortex IQ Nerve Centre *Catalogue Drift vs Amazon* is one of hundreds of KPI pulses Vortex IQ tracks across Shopify and 70+ other ecommerce connectors. Nerve Centre runs the detection layer; Vortex Mind investigates the cause when something moves; Ask Viq lets you interrogate any number in plain English. [Start for free](https://app.vortexiq.ai/login) or [book a demo](https://www.vortexiq.ai/contact-us) to see this metric running on your own data.