Wix Stores CSVs have the same holes. You do not need an app.

Blank SKU, $0 price, no productImageUrl, two rows sharing a SKU. Export the product CSV and check it in the browser.

Open the CSV check

How

1. Wix Dashboard → Store Products → More Actions → Export (or the Wix CSV template with handleId, fieldType, name, price, sku, productImageUrl).
2. Open csv-check.html and drop the file. Nothing is uploaded. Media-only rows are skipped.
3. Fix the rows that cannot sell. A ranked Monday list of 20 is the Store Audit (USD $149) — email the same CSV to info@shopgaps.com.

ShopGaps is not a Wix app and does not connect to your site. Squarespace: squarespace.html. WooCommerce merchants who want an on-site plugin can use Catalog Audit.