Marcin Pietrzak

This plugin allows your site to be compliant with the Directive of the European Parliament and of the Council (EU) 2019/2161 of November 27, 2019, known as the “Omnibus Directive.”
This plugin:
<ul>
<li>Saves the current price and keeps it.</li>
<li>Adds two additional fields in the product or course edit view: the lowest price and the effective date.</li>
<li>Display information on the item (product, course, etc).</li>
</ul>
Omnibus plugin support plugins:
<ul>
<li><a href="https://wordpress.org/plugins/woocommerce/" rel="ugc">WooCommerce</a></li>
<li><a href="https://wordpress.org/plugins/easy-digital-downloads/" rel="ugc">Easy Digital Downloads</a></li>
<li><a href="https://wordpress.org/plugins/learnpress/" rel="ugc">LearnPress</a></li>
<li><a href="https://wordpress.org/plugins/tutor/" rel="ugc">Tutor LMS</a> with WooCommerce</li>
<li><a href="https://wordpress.org/plugins/yith-woocommerce-product-bundles/" rel="ugc">YITH WooCommerce Product Bundles</a></li>
<li><a href="https://wordpress.org/plugins/debug-bar/" rel="ugc">Debug Bar</a></li>
</ul>
<h4>Directive (EU) 2019/2161 of the European Parliament</h4>
<blockquote>
Article 6a 
 1. Any announcement of a price reduction shall indicate the prior price applied by the trader for a determined period of time prior to the application of the price reduction. 
 2. The prior price means the lowest price applied by the trader during a period of time not shorter than 30 days prior to the application of the price reduction.
</blockquote>
Read more: <a href="https://eur-lex.europa.eu/eli/dir/2019/2161/oj" rel="nofollow ugc">Directive 2019/2161</a>.
<h4>See room for improvement?</h4>
Great! There are several ways you can get involved to help make Omnibus — show the lowest price better:
<ol>
<li>Report Bugs: If you find a bug, error or other problem, please report it! You can do this by <a href="https://wordpress.org/support/plugin/omnibus/" rel="ugc">creating a new topic</a> in the plugin forum. Once a developer can verify the bug by reproducing it, they will create an official bug report in <a href="https://github.com/iworks/omnibus" rel="nofollow ugc">GitHub</a> where the bug will be worked on.</li>
<li>Suggest New Features: Have an awesome idea? Please share it! Simply <a href="https://wordpress.org/support/plugin/omnibus/" rel="ugc">create a new topic</a> in the plugin forum to express your thoughts on why the feature should be included and get a discussion going around your idea.</li>
<li>Issue Pull Requests: If you’re a developer, the easiest way to get involved is to help out on <a href="https://github.com/iworks/omnibus/issues" rel="nofollow ugc">issues already reported</a> in GitHub. Be sure to check out the <a href="https://github.com/iworks/omnibus/blob/master/contributing.md" rel="nofollow ugc">contributing guide</a> for developers.</li>
</ol>
Thank you for wanting to make Omnibus — show the lowest price better for everyone!

Omnibus — show the lowest price

The plugin adds price compatibility with the EU Omnibus Directive.

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.

Omnibus — show the lowest price vs WPNest Price History for WooCommerce