Zerosoft Technologies

Zerosoft Upsell Engine for WooCommerce gives store owners two fully independent, fully free tools to show relevant products to shoppers:
1. Campaign Manager (rule-based)
Create manual upsell and cross-sell campaigns that target specific products, categories, or tags. Each campaign lets you hand-pick the recommended products and control exactly where and when they appear.
2. Smart Recommendations (automated)
A separate, standalone recommendation engine that automatically suggests products based on shared categories and tags. It runs independently from the Campaign Manager and is configured through its own dedicated settings page: WooCommerce -> Recommendation in the WordPress admin.
Both features are completely free and fully functional. There are no locked features, no upgrade prompts, and no premium tiers.
<h4>Campaign Manager Features</h4>
<ul>
<li>Create upsell campaigns (suggest higher-value alternatives) and cross-sell campaigns (suggest complementary products)</li>
<li>Trigger conditions: specific product, product category, or product tag</li>
<li>Display on product pages and/or the cart page</li>
<li>Choose the exact WooCommerce hook position for each page (e.g. after add-to-cart form, inside product summary, before/after cart totals)</li>
<li>Set campaign priority to control display order when multiple campaigns match</li>
<li>Enable or disable individual campaigns at any time</li>
<li>Browse and add recommended products by name search or by category</li>
</ul>
<h4>Smart Recommendations Features</h4>
Smart Recommendations is a fully independent feature with its own admin settings page (WooCommerce -> Recommendation). It is not part of the Campaign Manager and is configured separately.
<ul>
<li>Automatically suggests products based on shared product categories and tags</li>
<li>Scored relevance algorithm: exact category matches rank higher than related or accessory categories</li>
<li>Supports two recommendation sources: category-based and tag-based (either or both can be enabled)</li>
<li>Two display layouts: grid and slider/carousel</li>
<li>Configurable product limit (1-12 products)</li>
<li>Enable or disable display on product pages and cart pages independently</li>
<li>Configure the exact WooCommerce hook position for each page separately from campaign positions</li>
<li>Results are cached for performance using WordPress transients</li>
</ul>
<h4>Where Recommendations Appear</h4>
Both the Campaign Manager and Smart Recommendations support the following display positions:
<ul>
<li>Product page: After add-to-cart form (<code>woocommerce_after_add_to_cart_form</code>) or inside product summary (<code>woocommerce_single_product_summary</code>)</li>
<li>Cart page: Before cart totals (<code>woocommerce_before_cart_totals</code>) or after cart totals (<code>woocommerce_after_cart_totals</code>)</li>
</ul>
Campaign widgets and Smart Recommendation widgets are rendered separately. If a campaign matches the current page, it is shown first. Smart Recommendations fill in automatically when no matching campaign exists, or alongside campaigns depending on hook position.
<h4>Theme Compatibility</h4>
All frontend widgets inherit the active WooCommerce theme’s colours, fonts, and button styles where possible. No external stylesheets or scripts from third-party CDNs are loaded.
<h3>Source Code & Build</h3>
The plugin source code is included in this package.
For admin assets:
<ul>
<li>Build artifacts: <code>admin-ui/build/admin-ui/index.js</code> and <code>admin-ui/build/admin-ui/index.css</code></li>
<li>Build metadata: <code>admin-ui/build/admin-ui/index.asset.php</code></li>
<li>Build entrypoint/bootstrap file: <code>admin-ui/admin-ui.php</code></li>
</ul>
For source visibility during review, matching source copies of the admin build assets are included in:
<ul>
<li><code>admin-ui/src/admin-ui/index.js</code></li>
<li><code>admin-ui/src/admin-ui/admin.css</code></li>
<li><code>admin-ui/src/admin-ui/App.js</code></li>
<li><code>admin-ui/src/admin-ui/api.js</code></li>
<li><code>admin-ui/src/admin-ui/components/Campaigns.js</code></li>
</ul>
To rebuild the admin UI from source:
<ol>
<li>Install Node.js (18+) and npm.</li>
<li>
From the <code>admin-ui/</code> directory, run:
npm ci 
npm run build
</li>
</ol>
The build command is defined in <code>admin-ui/package.json</code> as: 
 wp-scripts build src/admin-ui/index.js –output-path=build/admin-ui
<h4>Third-Party Libraries</h4>
The bundled admin UI is built with the following direct third-party packages, all included under GPL-compatible licenses:
<ul>
<li><code>@wordpress/i18n</code> version <code>6.18.0</code> – License: <code>GPL-2.0-or-later</code> – Repository: <code>https://github.com/WordPress/gutenberg/tree/trunk/packages/i18n</code></li>
<li><code>@wordpress/scripts</code> version <code>31.8.0</code> – License: <code>GPL-2.0-or-later</code> – Repository: <code>https://github.com/WordPress/gutenberg/tree/trunk/packages/scripts</code></li>
</ul>
Inline admin/frontend behaviour has been moved to enqueued assets in:
<ul>
<li><code>assets/css/upsell-smart-settings-admin.css</code></li>
<li><code>assets/js/upsell-smart-settings-admin.js</code></li>
<li><code>assets/js/upsell-frontend.js</code></li>
<li><code>assets/js/widget-bootstrap.js</code></li>
<li><code>assets/js/smart-recommendations.js</code></li>
</ul>
This plugin requires WooCommerce to be installed and active.

Zerosoft Upsell Engine for WooCommerce

Smart upsell, cross-sell, and recommendation engine for WooCommerce with rule-based campaigns and an independent Smart Recommendations engine.

Forge12 Interactive GmbH

Forge12 Accessories for WooCommerce lets you link accessory products to your WooCommerce products and product categories. Selected accessories are displayed on the product page so customers can add them to the cart alongside the main product.
Whether you sell electronics with compatible cables, furniture with matching cushions, or cameras with lenses – this plugin makes it easy to suggest the right accessories at the right time.
<h4>Key Benefits</h4>
<ul>
<li>Increase Average Order Value – Suggest relevant accessories directly on the product page.</li>
<li>Save Time – Assign accessories to entire categories instead of individual products.</li>
<li>Cart Crossselling – Catch customers at checkout with accessory suggestions in the cart.</li>
<li>Full Control – Choose position, layout, headings and which accessories to show.</li>
</ul>
<h4>Free Features</h4>
<ul>
<li>Optional Accessories – Assign accessories per product or per product category.</li>
<li>Category Assignment – Assign accessories to entire product categories at once.</li>
<li>Cart Crossselling – Display accessories on the cart page for products already in the cart.</li>
<li>Grid, List & Checkbox Layouts – Display accessories in a responsive grid, list or “Frequently Bought Together” checkbox layout.</li>
<li>Inline Accessories – Show accessories between price and Add to Cart button with checkboxes and live total.</li>
<li>Design System – Customize colors, border radius and shadows with a visual design editor and preset themes.</li>
<li>Display Options – Control which product details are shown (image, title, price, stock, SKU, description).</li>
<li>Configurable Grid Columns – Choose between 2, 3 or 4 columns.</li>
<li>Configurable Position – Choose where accessories appear on the product page.</li>
<li>Custom Headings – Set a custom title and description for the accessories section.</li>
<li>Drag & Drop Sorting – Reorder accessories via drag and drop in the admin.</li>
<li>Shortcode – Use <code>[f12-woo-accessories]</code> to place accessories anywhere.</li>
<li>Template Overrides – Override plugin templates from your theme.</li>
<li>Responsive Design – Optimized for desktop, tablet and mobile.</li>
<li>HPOS Compatible – Fully compatible with WooCommerce High-Performance Order Storage.</li>
</ul>
<h4>Optional Features (Free)</h4>
These features can be enabled individually from the Features page:
<ul>
<li>Gutenberg Block – Place accessories via the block editor.</li>
<li>REST API – Access accessory data programmatically.</li>
<li>Schema.org Markup – Add structured data for accessories (isAccessoryOrSparePartFor).</li>
<li>Stock Alerts – Show stock status indicators on accessory items.</li>
<li>Product Preview Modal – Quick-view modal for accessory details.</li>
<li>Accessory Grouping – Group accessories by category with collapsible sections.</li>
<li>Recommended Badge – Highlight recommended accessories with a visual badge.</li>
<li>Bulk Assignment – Assign accessories to multiple products at once.</li>
<li>Inventory Check – Overview of accessory stock levels and warnings.</li>
<li>Import / Export – Import and export accessory assignments via CSV.</li>
</ul>
<h4>Pro Add-on</h4>
Unlock powerful features with <a href="https://www.forge12.com/product/woocommerce-zubehoer/" rel="nofollow ugc">Forge12 Accessories Pro</a>:
<ul>
<li>Required Accessories – Automatically add mandatory products to the cart.</li>
<li>Cart Lock – Prevent customers from removing required accessories.</li>
<li>Price Summary – Show combined price of product and accessories.</li>
<li>Product Hint – Display required accessories below the product excerpt.</li>
<li>Quantity Sync & Quantity Control – Sync accessory quantities with the main product.</li>
<li>AJAX Live Price – Update the combined price dynamically without page reload.</li>
<li>Bundle Discounts – Offer discounts when accessories are purchased together.</li>
<li>Variable Products – Use variable products as accessories with attribute selection.</li>
<li>Conditional Logic – Show or hide accessories based on product variations or cart contents.</li>
<li>Smart Rules – Auto-assign accessories based on categories, tags, attributes or price ranges.</li>
<li>Analytics Dashboard – Track accessory performance, revenue and conversion rates.</li>
<li>Slider, Accordion & Tabs Layouts – Additional display layouts for accessories.</li>
</ul>
<a href="https://www.forge12.com/product/woocommerce-zubehoer/" rel="nofollow ugc">Get Forge12 Accessories Pro</a>

Forge12 Accessories for WooCommerce

Add optional accessories to WooCommerce products and categories. Increase your average order value with product accessories, cart crossselling and cat …

Zerosoft Upsell Engine for WooCommerce vs Forge12 Accessories for WooCommerce