Select a Shopify location and load the catalog. Optionally select an exact vendor to limit the comparison.Upload a UTF-8 CSV, confirm SKU, per-unit cost and quantity columns, and select the number format.Confirm matching currencies and units. Review exceptions before using another tool to update your store.Installation sessions and access tokens are stored server-side using Shopify’s session interface and the configured database adapter. Catalog data passes through the authenticated app server to your browser and is not saved in the application database. Supplier files and results stay in browser memory unless you download them.No orders or customer records are requested. Uninstall and shop-redaction webhooks delete the store’s application sessions and usage events. Downloaded reports remain on your device. Hosting providers may retain ordinary request metadata under their policies.BRAMKAS records app opens, successful catalog loads, supplier-file parsing, check starts and completions, report-download requests, broad error categories, and optional usefulness votes. Events contain a pseudonymous store identifier, timestamp, app version, and a random check identifier where needed. Public demos use a temporary anonymous visit identifier and are counted separately from installed stores. Internal development-store activity is also separate.Analytics does not include supplier files, filenames, SKUs, costs, catalog or report contents, email addresses, access tokens, or detailed error messages. Only BRAMKAS’s password-protected owner dashboard can view these metrics. Events are scheduled for deletion after 90 days, with daily cleanup, and deleted on uninstall or shop redaction. Delivery is best effort; supplier files and comparison results remain in your browser.Up to 20,000 variants and supplier rows; supplier files up to 5 MB. Catalog data can change while loading. Missing cost or location stock is unavailable, not zero. Product margin excludes shipping, taxes, fees and returns. Currency conversion is not supported. Tax-inclusive store prices disable product-margin checks. Flags are reasons to investigate, not proof of an error.No subscription or charge is implemented. Paid plans require Shopify App Pricing configuration and testing. Publish business contact details and finalized privacy terms before App Store submission.