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

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

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.

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