Back In Stock Notifier for WooCommerce | WooCommerce Waitlist Pro vs Smush – Image Optimization, Compression, Lazy Load, WebP & CDN

Every out-of-stock product is a lost sale waiting to happen. Back In Stock Notifier for WooCommerce captures those visitors instead of losing them. It shows an email subscription form on out-of-stock products, then automatically emails every subscriber the moment the product is restocked. Try the Live Demo | Documentation & Support | Browse Add-ons Why store owners choose this plugin Built for scale. Restock emails are sent through a background process engine. Even with 10,000+ subscribers on a single product, notifications go out reliably. No server crashes, no timeouts, no duplicate emails that loop-based plugins suffer from. Works out of the box. Activate the plugin and the waitlist form appears on out-of-stock products immediately. No setup required. Native WooCommerce emails. The subscription confirmation and restock notification emails use the WooCommerce email system, so they match your store branding and are fully customizable under WooCommerce > Settings > Emails. Trusted by 20,000+ stores worldwide. Supported product types Simple and Variable products (product level and variation level) Grouped products Simple and Variable Subscriptions (WooCommerce Subscriptions) Product Bundles (WooCommerce Product Bundles) Core features Automatic restock emails sent through a reliable background process Email subscription form on out-of-stock products, for both guests and members Email address pre-filled for logged-in members Duplicate check per product, the same email is never added twice to a waitlist Customizable subject and message with placeholders like {product_name}, {product_link}, {cart_link} and more Customizable form labels, messages, and error texts Option to show the subscribe form for backorder products Fair Sending (First-Come-First-Served), on a limited restock notify only as many subscribers as units in stock, the rest stay on the waitlist for the next restock Email speed limit, send automatic emails gradually to respect hosting and SMTP provider limits Six subscribe form designs (Default, Card, Minimal, Compact, Bold, Outline) and six popup designs including five lightweight popups that need no extra library, all chosen from the settings page Auto Coupon, optionally send each subscriber a unique discount code that only works on the exact product or variation they waited for, with full control over discount type, amount, expiry, usage limit, minimum spend and sale item rules Product table placeholder for both emails, showing the subscribed product in a classic order style table with thumbnail, SKU, quantity and price Stock status filter on the subscribers list, including “in stock but below your notification threshold” to find subscribers the automatic sender skipped Auto-retry for stuck emails, an optional recovery task that resends notifications when a background job fails or never runs New subscriber indicator on the admin menu and subscribers list, showing how many people signed up since your last visit Bot protection with Google reCAPTCHA (v2/v3) and Cloudflare Turnstile Subscriber management dashboard to view, sort, filter, and delete subscribers Manual and bulk send instock mail actions Dashboard report widget with subscription and mail statistics Estimate Stock Arrival messages on the subscribe form Auto-delete old subscriber entries on a schedule GDPR-friendly privacy checkbox Third-party inventory management support (stock updated directly in the database) REST API to create, read, update, and delete subscribers Webhooks for subscription events Quantity field support Works with Elementor Translation ready Premium Add-ons Supercharge your waitlist with premium add-ons. Every purchase is a one-time payment with lifetime updates. No subscriptions, no recurring fees. You can browse and manage everything from your dashboard under Instock Notifier > Plugins & Add-ons. Best value: get Bundle Add-ons, all 15 add-ons plus every future add-on, for one discounted price. Bundle Add-ons – All 15 add-ons below plus any future add-ons, at one discounted price. Double Opt-In – Subscribers confirm by email before joining the waitlist. Keeps your list clean and compliant, and unconfirmed entries are auto-deleted after X days. Unsubscribe – Adds an unsubscribe link to emails, and members can manage their waitlists from My Account. Ban Emails – Block disposable email domains (mailinator and similar), public domains, and specific addresses to stop fake signups. Never Restock – Product discontinued? Point waiting subscribers to an alternative product and notify them when it becomes available, so no waitlist goes to waste. Mailchimp – Automatically sync waitlist subscribers to your Mailchimp audience in the background. Klaviyo – Sync subscribers to Klaviyo and trigger Klaviyo Flows for Back In Stock and Successful Subscription events, so you can build advanced automations and campaigns. ActiveCampaign – Sync subscribers to ActiveCampaign automatically. Twilio SMS – Send restock alerts by SMS in addition to email, so customers never miss a restock. Track Sales – See which subscribers purchased after receiving a restock email and measure the revenue your waitlist recovers. Export CSV – Export subscriber lists to CSV for records, newsletters, or promotions. Import CSV – Import subscribers from a CSV file when migrating from another platform or store. Edit Subscribers – Correct or update existing subscriber entries directly from the admin. Custom CSS – Style the subscribe form with color, size, and custom CSS options. No coding needed. WPML – Send every email in the subscriber’s own language using WPML string translation. Polylang – Send subscription and restock emails in the subscriber’s chosen Polylang language. See the full catalog at propluginslab.com, with more add-ons coming soon. More Plugins by ProPluginsLab Free plugins All available free on WordPress.org: Recovero – Cart Recovery for WooCommerce – Recover abandoned carts automatically with reminder emails and win back lost revenue. Affireo – Affiliates for WooCommerce – Run your own affiliate program with referral tracking and commissions. Christmas Snow – Festive Snowfall Effect – Add a festive snow effect to your site for the holiday season. Pro plugins Nine standalone premium WooCommerce plugins, each a one-time payment with lifetime updates: Vendero – Multivendor for WooCommerce – Turn your store into a complete multi vendor marketplace with vendor dashboards, commissions and payouts. Recovero – Cart Abandonment Recovery for WooCommerce – Advanced abandoned cart recovery with automated follow up campaigns and detailed reporting. Anticipo – Pre-Orders for WooCommerce – Sell products before they are released and take payment upfront or on release. Trackero – Advanced Shipment Tracking for WooCommerce – Complete fulfillment manager. Add tracking numbers to orders and keep customers informed in order emails. Kitero – Composite Products for WooCommerce – Let customers build their own kits, boxes and product combos, with a built in product bundle feature. Giftero – Gift Cards for WooCommerce – Sell digital gift cards with customizable templates, scheduled delivery and balance management. Plusero – Extra Fees for WooCommerce – Add conditional fees and surcharges based on cart total, shipping method, payment gateway, category, user role and more. Inputo – Name Your Price for WooCommerce – Let customers choose their price. Perfect for donations, tipping and pay what you want campaigns. Affireo – Affiliates for WooCommerce – Full affiliate marketing suite with multi tier commissions, payouts and performance reports. Visit ProPluginsLab for all our premium WooCommerce plugins and solutions.

Compress images, optimize images, and enable image lazy load automatically with the powerful Smush image optimizer to keep your WordPress site fast, without losing quality. Smush makes it easy to optimize images, compress images, and deliver images faster across your entire WordPress site. This all-in-one image optimizer automatically reduces image file sizes, enables image lazy load, and serves modern formats like WebP and AVIF, all without breaking image quality or adding extra work. Whether you’re running a blog, store, or portfolio, Smush helps you optimize images at scale and keep your site fast with a trusted WordPress image optimizer. Trusted by 1+ Million Sites | 4.8/5 Star Rating Get everything you need to optimize images and speed up your site. Smush works out of the box with no complicated setup – just install and let it handle the rest. Compress images without losing quality Reduce image file size automatically while keeping your images sharp and clear. Smush is an easy-to-use image optimizer which let’s you compress images using both lossless and lossy compression, giving you the best balance of quality and performance without extra work. You can also compress images outside the media library using Directory Smush, making it easy to optimize images stored in theme folders, plugins, or other directories on your server. Lazy load images for faster pages Enable image lazy load across your site so images load only when needed. This image optimizer improves initial page speed and creates a smoother experience for visitors without extra configuration. Serve WebP and AVIF images automatically (PRO) Convert images to WebP and AVIF and serve them automatically to supported browsers. Smush helps you optimize images using next-gen formats to reduce file size and improve load times across your WordPress site. Deliver images faster with an Image CDN (PRO) Serve images through a global image CDN to reduce latency and improve load times for visitors around the world. 119 global CDN servers Up to 500 GB of bandwidth Faster image delivery based on visitor location Improved performance for image-heavy and high-traffic sites Automatically resize and fix image dimensions (PRO) Eliminate common PageSpeed warnings and improve layout stability with automatic image sizing. Smush dynamically resizes images to perfectly fit their containers, regardless of original size, helping fix the “Properly size images” warning in Google PageSpeed Insights. It also automatically adds missing width and height attributes to your images, improving rendering speed and reducing layout shifts. This helps you meet the “Ensure images have explicit width and height” recommendation without any manual work. Optimize your entire site, automatically Smush works across your whole site as a powerful image optimizer to optimize images as you upload them and maintain performance over time without manual work. Optimize images automatically on upload Compress images in bulk or individually Works with your existing media library No need to re-upload images Enable image lazy load across your site Convert images to WebP and AVIF Deliver images with an integrated image CDN Automatically resize and serve correctly sized images Optimize images outside the media library with Directory Smush Built for performance Smush improves page speed and overall performance by reducing image weight and improving how images are delivered. Reduce page load times Improve user experience Better performance for image-heavy pages Supports image lazy load and preload images (PRO) for faster perceived performance Works with your existing setup Smush is built to work with your current WordPress setup, including popular themes, page builders, and plugins. Compatible with Gutenberg, Elementor, WPBakery, and more Works with WooCommerce stores No need to change your workflow Easy to enable and configure Designed to be simple You don’t need to be a performance expert to optimize images with Smush image optimizer. Works out of the box Simple settings when you need them No technical knowledge required Safe to use on any site Why choose Smush? There are plenty of image optimization plugins, but Smush focuses on making it easy to optimize images, compress images, and improve performance without complexity. As a leading WordPress image optimizer, Smush gives you powerful optimization tools without the technical hassle. Trusted by over 1 million WordPress users Built specifically for WordPress Regular updates and improvements Backed by the WPMU DEV team Get started in minutes Install Smush, activate it, and start to compress images, optimize images, and enable image lazy load right away. This easy-to-use image optimizer helps most sites see improvements immediately without changing how they upload or manage images. About Us WPMU DEV is a premium supplier of quality WordPress plugins, services and support. Learn more here: https://wpmudev.com/ Don’t forget to stay up to date on everything WordPress from the Internet’s number one resource: WPMU DEV Blog Hey, one more thing… we hope you enjoy our free offerings as much as we’ve loved making them for you! Contact and Credits Originally written by Alex Dunae at Dialect (dialect.ca, e-mail ‘alex’ at ‘dialect dot ca’), 2008-11.