When a product sells out, every visitor who wanted it is a lost sale, unless you offer to notify them when it returns. Back in stock plugins collect emails on sold-out products and send an alert automatically. They all sound similar; here is what actually makes the difference.
1. Variation support
In fashion and many other stores, products do not sell out entirely: a size or colour does. The form must appear when the shopper selects a sold-out variation, and the alert must be sent when that specific variation returns.
2. Fully automatic emails
The alert should go out as soon as the stock status changes back to “In stock”, without you clicking anything. Check that emails use your WooCommerce email design and include the product photo, price and a direct button.
3. Sending in batches
If 300 people wait for the same product, sending 300 emails at once can overload shared hosting or trigger spam filters. Batched sending (for example through WooCommerce’s Action Scheduler) is more reliable.
4. Demand insights
A “most wanted products” ranking tells you what to reorder first. A subscribers list with search and CSV export is useful too.
5. Privacy
An optional consent checkbox, data stored on your own site and support for WordPress personal data export and erase tools keep you on the safe side of privacy rules.
6. Works with page caching
If your store uses a caching plugin, forms with expired security tokens can fail silently. Check that the plugin is designed to work on cached pages.
7. Spam protection
Honeypot fields and rate limiting stop bots from filling your list with fake addresses.
8. Pricing
Some notifier services charge monthly based on the number of subscribers or emails. A plugin that sends through your own site with a one-time price is often much cheaper.
Checklist
- Variation-level alerts
- Automatic, branded emails
- Batched sending
- Most wanted ranking, CSV export
- GDPR tools
- Cache-friendly, spam-protected
- One-time price
Our option
Restockly was built on this list: variation forms, automatic batched emails in your WooCommerce design, a most wanted ranking, CSV export, GDPR tools and spam protection that works on cached pages. Try the back in stock demo, and read back in stock best practices.
Frequently asked questions
Should I hide out-of-stock products?
Usually not: you lose their search traffic and the chance to collect emails. Show them with a back in stock form.
Do back in stock emails convert?
They go to people who explicitly asked for that product, so they are among the best-performing emails a store sends.
What about pre-orders?
Pre-orders take payment in advance; back in stock alerts only notify. Choose based on whether you have a firm restock date.