Webmasters.Team

WT Waitlist is a “back in stock” waitlist for WooCommerce without bloat. Customers leave their email on an out-of-stock product page, and when the stock returns — the plugin sends a notification in the background through Action Scheduler.
Built by the <a href="https://webmasters.team" rel="nofollow ugc">webmasters.team</a> team. Open-source code, no external APIs, all data stored locally in the WordPress database.
<h4>Key features</h4>
<ul>
<li>Signup form replaces Add to cart for out-of-stock products, with variation support (per size/color).</li>
<li>Custom database tables (<code>{prefix}_waitlist_subscriptions</code>) — we do not clutter <code>wp_postmeta</code>, the plugin scales to tens of thousands of subscriptions.</li>
<li>Action Scheduler queue (bundled with WooCommerce): batch of 50 emails per tick, automatic retries, retry log visible in <code>WooCommerce → Status → Scheduled Actions</code>.</li>
<li>5 min throttle per product — prevents duplicate sends when multiple hooks fire (e.g. quantity change followed by status change).</li>
<li>One-click unsubscribe via a link in the email (SHA-256 token), no confirmation or login required.</li>
<li>GDPR-ready: consent logging (anonymized IP, timestamp, user agent), integration with WordPress Privacy Tools (export and erasure of data per email).</li>
<li>CSV export of subscribers from the admin panel (streamed, no timeouts on large lists).</li>
<li>Anti-spam: honeypot plus rate limiter per IP (10 submissions per hour).</li>
<li>Theme compatibility: classic themes (Storefront, Twenty Twenty-One/Two/Three) plus block themes (Twenty Twenty-Four/Five) — the form attaches through a hook for classic templates and through a <code>render_block</code> filter for FSE.</li>
<li>Zero external dependencies: apart from WooCommerce, requires only plain PHP 8.0+.</li>
</ul>
<h4>Shortcode fallback</h4>
<pre><code>[wt_waitlist product_id="123"] — use this if your custom product template does not fire the standard hooks.
</code></pre>
<h4>What WT Waitlist does NOT do (by design)</h4>
<ul>
<li>No SMS, no Mailchimp/MailerLite integrations in the free version.</li>
<li>No double opt-in (minimal flow — leave email, get notification).</li>
<li>No WYSIWYG editor for email templates (HTML template lives in the plugin file, override with the <code>wt_waitlist/notification_context</code> filter).</li>
</ul>
These features are planned for the Pro edition. The free edition covers 100% of the core waitlist flow.

WT Waitlist

Lightweight waitlist for WooCommerce — automatic email notifications when an out-of-stock product (or variation) is back in stock.

modulux

MLX Back In Stock Notifier for WooCommerce allows your customers to opt-in for email notifications when their desired out-of-stock products are replenished.
Designed strictly to WordPress and WooCommerce coding standards, this plugin provides a seamless frontend experience for customers and a powerful backend management interface for store administrators, without bloating your database.
<h3>Core Features</h3>
<ul>
<li>Automated Notifications: Customers receive an instant email the moment a product’s stock status changes to “In Stock”.</li>
<li>Customer Management: Adds a native “Stock Notifications” endpoint to the WooCommerce My Account page where users can view and remove their waitlist items.</li>
<li>Admin Waitlist Dashboard: View an aggregated list of all out-of-stock products that have customers waiting.</li>
<li>Alternative Product Suggestions: Manually email waiting customers to suggest a different, in-stock product using WooCommerce’s native AJAX product search and customizable message templates.</li>
<li>Performance Optimized: Uses native WordPress metadata API and caching. No custom database tables.</li>
<li>Fully Compatible: Officially declares compatibility with WooCommerce High-Performance Order Storage (HPOS) and Cart/Checkout Blocks.</li>
<li>Clean Cleanup: Automatically removes waitlist data if a product is permanently deleted from the store.</li>
<li>Enterprise-Grade Scalability: Built on WooCommerce Action Scheduler. Whether you have 10 or 10,000 customers on a waitlist, emails are processed safely in the background in batches. Your site will never freeze or crash when updating stock.</li>
<li>Full Variable Product Support: Works flawlessly with product variations (e.g., sizes, colors). Customers can subscribe to specific out-of-stock variations, and the waitlist UI updates instantly as they select different options from the dropdowns.</li>
<li>Performance & Security Optimized: Zero inline JavaScript or CSS. All assets are properly enqueued and localized, ensuring maximum compatibility with caching plugins (like WP Rocket) and strict Content Security Policies (CSP).</li>
</ul>

MLX Back In Stock Notifier for WooCommerce

A lightweight, HPOS-compatible solution for WooCommerce stock notifications with advanced admin waitlist management.

WT Waitlist vs MLX Back In Stock Notifier for WooCommerce