Patryk

Plugin adds two additional fields in the product edit view – for the lowest price and the effective date. This information is displayed on the product page. This is related to the upcoming Omnibus EU directive.
Global information “per product”, without support for variants. 
If you need support for variants and automation, check out the “PerfectWP – WC Omnibus” plugin: 
https://wordpress.org/plugins/perfectwp-wc-omnibus/
Plugin ready to translation (languages​​/omnibus-for-woocommerce.pot)
Custom CSS ready:
Main element (DIV): .pryc_wp_wc_omnibus_product_field 
Text (SPAN): .pryc_wp_wc_omnibus_product_field .text 
Price (SPAN): .pryc_wp_wc_omnibus_product_field .price 
Proce, currency symbol (SPAN): .pryc_wp_wc_omnibus_product_field .price .currency 
Text separator (SPAN): .pryc_wp_wc_omnibus_product_field .separator 
Date (SPAN): .pryc_wp_wc_omnibus_product_field .date

PRyC WP: Omnibus for WooCommerce

Plugin adds two additional fields in the product edit view - for the lowest price and the effective date. This information is displayed on the product …

WPNest

WPNest Price History for WooCommerce gives WooCommerce stores automatic compliance with the EU Omnibus directive (Directive 2019/2161, in force across the EU since May 2022, in Poland from January 2023).
The plugin records every price change in your store with a timestamp and renders the legally required notice — “Najniższa cena z 30 dni przed obniżką: X” — under the price on every product page where a discount is announced.
<h4>Key features (Free)</h4>
<ul>
<li>Automatic price capture — every change made via admin, REST API, WP-CLI, CSV import, or programmatic save is recorded with timestamp.</li>
<li>Daily snapshot failsafe — a cron job ensures every published product has at least one history row per 24h, even when capture hooks miss.</li>
<li>30-day-low calculation — uses the legally correct “Omnibus” method (lookback from the moment the current sale started). A “Rolling” alternative is available for stores that prefer it.</li>
<li>Configurable label — the notice text is fully customizable per language.</li>
<li>Display options — single product page (required), shop loop, cart line items.</li>
<li>Variable products — per-variation tracking with frontend handler that updates the notice when a variation is selected.</li>
<li>Custom CSS — paste your own styles for the notice without editing files.</li>
<li>Per-product mini-chart in the admin product edit screen.</li>
<li>WP-CLI support — <code>snapshot</code>, <code>cleanup</code>, <code>backfill</code>.</li>
<li>Backfill on activation — seeds the history table with current prices so the 30-day window is never empty.</li>
<li>Cleanup cron — automatically removes entries older than the retention window (default 90 days).</li>
<li>Cache — transient-based (12h TTL) with automatic invalidation on every price change.</li>
<li>Compatible with HPOS (WooCommerce custom order tables).</li>
</ul>
<h4>Compliance basis</h4>
This plugin implements requirements from:
<ul>
<li>EU Directive 2019/2161 (“Omnibus”) — applicable across all EU member states.</li>
<li>Polish Ustawa o informowaniu o cenach towarów i usług, art. 4 ust. 2 — domestic transposition, in force since 1 January 2023.</li>
</ul>
UOKiK (the Polish Office of Competition and Consumer Protection) actively monitors compliance and may impose fines of up to 10% of annual revenue. The most commonly flagged violation is “price gymnastics” — artificially inflating the regular price shortly before a sale to make the discount appear larger.
<h4>Pro version</h4>
A Pro extension is available with additional features for shops that want to go beyond the legal minimum: public price history chart on product pages, Omnibus violation detector, compliance dashboard, webhooks (Slack/Discord), CSV export for audit, tamper-proof hash chain, white-label, and more. See https://wpnest.pl/sklep/prawo-i-formalnosci/wpnest-price-history-pro/ for details.
<h3>Third-Party Libraries</h3>
This plugin bundles the following libraries:
<ul>
<li>Chart.js v4.5.1 — MIT License, https://www.chartjs.org/ — used to render the per-product price history chart in the admin product edit screen.</li>
<li>chartjs-adapter-date-fns v3.0.0 (bundle including date-fns) — MIT License, https://github.com/chartjs/chartjs-adapter-date-fns — date adapter required by Chart.js v3+ for time-scale axes on the price history chart.</li>
</ul>

WPNest Price History for WooCommerce

EU Omnibus directive compliance for WooCommerce — shows the lowest price from the last 30 days when a product is on sale.

PRyC WP: Omnibus for WooCommerce vs WPNest Price History for WooCommerce