Nadirmark Omnibus Lowest Price for WooCommerce

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Every discount in an EU shop must show the lowest price of the previous 30 days. WooCommerce does not do this by itself.

Since 28 May 2022 the EU Omnibus directive (Directive 2019/2161, article 6a of Directive 98/6/EC) requires every price reduction announcement to state the lowest price the product had in the 30 days before the reduction. Consumer authorities in Germany, Poland, France, the Netherlands and other member states enforce it. A «was €100, now €80» without that line is a violation.

Nadirmark records every price change of every product and variation, calculates the correct reference price for each sale and shows it under the price, on product pages, in shop lists and for the selected variation. When the history cannot back a figure up, Nadirmark shows nothing instead of a wrong number.

See it in two minutes:

How it works

1. Activate the plugin. From that moment every price change is recorded, whichever route it takes: the product editor, quick and bulk edit, the REST API, CSV imports, scheduled sales or plugins that write prices directly.
2. Import prices from your past orders under WooCommerce → Nadirmark → Tools. Every paid order proves what a customer paid on that day, so the 30-day window is covered right away for products you have sold.
3. Put a product on sale as usual. Nadirmark adds «Lowest price in the last 30 days: €…» in the language of your site (built-in wording for 15 languages, or your own text).

What makes Nadirmark different

• Never a figure you cannot prove. Nadirmark knows exactly which period its own records cover. When the 30-day window is not fully covered it hides the line instead of showing a reference price it cannot back up.
• Correct rule, not just a minimum. The reference is the lowest price in the 30 days before the reduction started. When you lower a running sale further, the reference from before the first reduction is kept, as the directive allows. A rolling «last 30 days» mode is available for shops that prefer it.
• Tamper-evident history. Every record is chained to the previous one with a SHA-256 hash and stores who changed the price and through which route. Retention is configurable (24 months by default); the latest price of every product is always kept.
• One record per change, not per page view. Small table, fast pages, even with thousands of products.
• Variations done right. Each variation is tracked separately and the line follows the variation the customer selects.
• Block themes and classic themes. Works with the Product Price block, classic templates, shop loops, related products, a shortcode and a template function.
• Switch without losing history. Imports the data left behind by Omnibus (iworks) and WC Price History.

Included in this free plugin

• Price history per product and variation with source and user.
• Lowest price in the 30 days before the reduction (or a longer period of your choice).
• Progressive-discount handling and a rolling-window mode.
• Display on product pages, in shop and category lists and for selected variations; shortcode [nadirmark_lowest]; template function nadirmark_lowest_price_html().
• Built-in wording for Dutch, German, French, Polish, Italian, Spanish, Portuguese, Swedish, Danish, Finnish, Czech, Romanian, Hungarian, Greek and English; custom wording with {price} and {days}.
• Import from past orders; import from Omnibus (iworks) and WC Price History.
• Overview of all sale products with their reference price and status.
• Price history tab on every product, with a documented manual reference price for special cases.
• Daily check that catches price changes made outside WordPress hooks.
• Configurable retention, optional deletion on uninstall.

Nadirmark Pro adds a campaign planner (which reference price may you show on the start date, is the planned price a real reduction, and will Google Shopping display the sale label), a fake-discount guard that shows non-reductions as plain prices, a verified audit export and printable report, and a daily alert e-mail. Pro is sold separately by the plugin author at checkout.freemius.com and has no free trial; see «Upgrade to Pro» below. The free plugin above is complete on its own and stays free.

Good to know

Nadirmark is a tool that helps you apply the price-reduction rules; it is not legal advice. Rules on progressive discounts, perishable goods and products newer than 30 days differ per member state. Check the guidance of your national consumer authority.

Upgrade to Pro

Nadirmark Pro is a separate, paid plugin by the same author that runs next to this free plugin. It adds:

• Campaign planner: for a planned start date and price, see per product which reference price you may show, whether the planned price is a real reduction and whether Google Shopping would display the sale label.
• Fake-discount guard: a sale price that is not below the documented reference price is shown as a plain price, without strikethrough, badge or lowest-price line.
• Audit: SHA-256 chain verification, CSV export of all price records and a printable report per period or product.
• Daily alert e-mail listing sale products without enough history and guarded products.

Nadirmark Pro has no free trial. Details: Nadirmark Pro