Looking for the best shopify back in stock apps for 2026? Restock Alert & Waitlist ‑ Mini (4.7, 35 reviews) is a lightweight, purpose-built waitlist, product drop, and back-in-stock app: fully editable email templates that match your own brand, and a custom section you can create and update natively inside Shopify Admin.
REZ Preorder, Back In Stock (5.0, 1,208 reviews) bundles pre-order on top of back-in-stock alerts, a broader and more complex feature set, with a free tier capped at 30 preorders and 100 emails a month before paid plans from $4.99 to $28.99/month kick in. Appikon Back In Stock (4.7, 1,413 reviews, free plan plus paid tiers) adds SMS, push, and Facebook Messenger channels most merchants never end up configuring.
This roundup compares all three of the best shopify back in stock apps on what each is actually built for, not just star ratings.
In this post:
- What a Shopify back-in-stock app actually needs to do
- Comparison table: 3 Shopify back-in-stock apps
- Restock Alert & Waitlist ‑ Mini: a lightweight, purpose-built waitlist app
- REZ Preorder, Back In Stock: pre-order bundled in, at a cost
- Appikon Back In Stock: more notification channels, more to configure
- Free plans compared
- How to choose
- FAQ
Quick disclosure: I’m the founder of Minimate Apps, and Restock Alert & Waitlist ‑ Mini is one of the three apps compared below, so weigh that accordingly. Every rating, review count, and price comes from the apps’ own public Shopify App Store listings, pulled the week this post was written, verify them directly before you decide.
What a Shopify Back-in-Stock App Actually Needs to Do
At minimum, any of the best shopify back in stock apps should let a customer sign up for a notification on a sold-out product, and email them automatically when it restocks. Beyond that baseline, apps differentiate on notification channels (email vs. SMS vs. push) and automation depth (Shopify Flow, CSV export for manual campaigns).
They also differ on how easy the email templates are to make match your brand, and whether the free tier is usable long-term or just a trial. That’s the baseline every one of the best shopify back in stock apps should clear before anything else matters.
Comparison Table: The Best Shopify Back-in-Stock Apps Ranked
Here’s how the three best shopify back in stock apps in this comparison stack up side by side:
| App | Rating | Reviews | Pricing | Best For |
|---|---|---|---|---|
| Restock Alert & Waitlist ‑ Mini (us) | 4.7 | 35 | Free (1 product, 250 emails/mo), Premium $8.99/mo | Lightweight waitlist, product drop, and back-in-stock app, brand-matched editable email templates, native Shopify Flow, custom email domain, CSV export |
| REZ Preorder, Back In Stock | 5.0 | 1,208 | Free (30 preorders/100 emails per mo), Basic $4.99/mo, Growth $14.99/mo, Scale $28.99/mo, plus overage fees | Pre-order bundled with back-in-stock, more complex feature set at higher usage |
| Appikon Back In Stock | 4.7 | 1,413 | Free plan, paid tiers available | SMS, push, and Facebook Messenger channels, more notification channels to configure |
Restock Alert & Waitlist ‑ Mini: A Lightweight, Purpose-Built Waitlist App
Restock Alert & Waitlist ‑ Mini is rated 4.7 and built to do one job well: waitlist signups, product drop alerts, and back-in-stock emails, without a bloated feature set to configure around it. Email templates are fully editable so restock and drop notifications match your store’s actual branding, not a generic default.
The custom section that powers signup collection can be created and updated natively inside Shopify Admin, no external editor or third-party dashboard required. Of the best shopify back in stock apps in this roundup, it’s the only one built this way.
What we offer that neither REZ nor Appikon does: native Shopify Flow triggers for restock automation, a custom email sending domain (so restock emails come from your own domain, not a shared one), and CSV export for manual campaign work. The free plan covers 1 product and 250 restock emails a month, Premium is $8.99/month for unlimited products and emails.
One honest limit worth naming: we don’t have SMS or push notification channels, only email, and pre-order support is a feature gap REZ already covers. If pre-order is genuinely the deciding factor, REZ is worth a look, though it brings more setup complexity and a usage-based pricing structure along with it.
“This app is an absolute game-changer for my online store! It’s incredibly user-friendly and seamlessly integrates with my website. The notifications feature works like a charm, ensuring my customers are instantly alerted when their desired products are back in stock. This has significantly reduced missed sales opportunities and improved customer satisfaction.”
Source: LEFEET, Hong Kong SAR (Shopify App Store review)
REZ Preorder, Back In Stock: Pre-Order Bundled In, at a Cost
REZ carries the highest rating in this comparison at 5.0 across 1,208 reviews, and it does combine pre-order, notify-me, and back-in-stock alerts in one tool. That breadth is also the catch: REZ isn’t free at any scale the way it’s sometimes described.
The free plan caps out at 30 preorders and 100 emails a month, and features like customizing the email sender or removing branding require the paid tiers. Past that free cap, pricing runs Basic at $4.99/month (150 preorders, 1,000 emails), Growth at $14.99/month (400 preorders, 2,000 emails), and Scale at $28.99/month (700 preorders, 3,000 emails).
Each paid tier also carries per-unit overage fees on top ($0.25, $0.15, or $0.10 per preorder over the limit, depending on tier, plus $1 per 100 emails over the limit). Among the best shopify back in stock apps compared here, REZ is the one with the most moving parts to track.
Negatives worth naming plainly: pre-order support pulls in a more complex feature set than a merchant who only wants straightforward back-in-stock alerts actually needs. The tiered, usage-based pricing with overage fees also makes total monthly cost harder to predict than a flat plan.
Appikon Back In Stock: More Notification Channels, More to Configure
Appikon is rated 4.7 across 1,413 reviews. Its stated differentiator is notification channel breadth, email, SMS, Facebook Messenger, and web push, plus built-in analytics on alert performance.
In practice, the Facebook Messenger channel is of limited use for most merchants, opt-in rates for back-in-stock alerts through Messenger are low, and Meta’s platform changes have made Messenger notifications less reliable over time. Configuring four separate channels also adds setup complexity most stores don’t actually need for a straightforward restock alert.
It offers a free plan, though full paid pricing wasn’t listed publicly at the time of writing, worth checking the live listing before committing if multi-channel alerts are genuinely the deciding feature for your store.
Free Plans Compared
A common follow-up question inside this best shopify back in stock apps search is which option is actually free to run. None of the three is unlimited-free at real scale.
Restock Alert & Waitlist ‑ Mini’s free plan covers 1 product and 250 emails/month with full automation included, no preorder cap to track. REZ’s free plan caps at 30 preorders and 100 emails/month, with several features, including customizing the email sender and removing branding, locked to paid tiers. Appikon’s free plan exists but paid tiers unlock the SMS/push channels most merchants pick Appikon for in the first place.
If a genuinely usable free tier matters more than anything else in your search for the best shopify back in stock apps, weigh the product and volume caps closely, not just whether a plan is labeled “free.”
How to Choose Among the Best Shopify Back in Stock Apps
- Want a lightweight, purpose-built waitlist and back-in-stock app with brand-matched email templates, native Shopify Flow, a custom sending domain, or CSV export: Restock Alert & Waitlist ‑ Mini.
- Specifically need pre-order bundled with back-in-stock alerts and don’t mind a tiered, usage-based pricing structure as volume grows: REZ.
- Need SMS, push, or Facebook Messenger notification channels and are prepared to configure and pay for that added complexity: Appikon.
Whichever of the best shopify back in stock apps you land on, install it before you actually need it. Testing a broken signup form during a real sellout is worse than not having one at all.
We’d push back on the assumption that a longer feature list automatically means the better fit. If a genuinely simple setup, Shopify Flow integration, or a branded sending domain is the actual requirement, neither REZ nor Appikon offers all of that today, and no amount of extra features changes that.
See our guide on how to create a waitlist on Shopify for the setup steps behind a restock notification flow, or the best Shopify plugins for urgency and low stock if scarcity messaging on in-stock products is the next thing you’re evaluating.
Shopify’s own inventory management documentation is a useful baseline for what stock tracking looks like natively before adding any app on top.
Frequently Asked Questions
- 1. What are the best shopify back in stock apps for 2026?
- Among the best shopify back in stock apps compared here, Restock Alert & Waitlist ‑ Mini is a lightweight waitlist, product drop, and back-in-stock app with brand-matched email templates, Shopify Flow, and a custom email domain. REZ Preorder, Back In Stock (5.0, 1,208 reviews) bundles pre-order with back-in-stock alerts on a tiered, usage-based pricing plan. Appikon (4.7, 1,413 reviews) adds SMS and push channels.
- 2. What is the best free back in stock app for Shopify?
- None of the three offers unlimited free usage at real scale. Restock Alert & Waitlist ‑ Mini’s free plan covers 1 product and 250 emails/month with full automation included. REZ’s free plan caps at 30 preorders and 100 emails/month with several features locked to paid tiers. Appikon’s free plan exists but paid tiers unlock its SMS/push channels.
- 3. Do back in stock apps support SMS notifications?
- Appikon supports SMS, push, and Facebook Messenger alongside email, though Messenger delivery has gotten less reliable industry-wide. REZ and Restock Alert & Waitlist ‑ Mini are email-based.
- 4. Can I automate restock emails with Shopify Flow?
- Restock Alert & Waitlist ‑ Mini is the only one of the three compared here with native Shopify Flow triggers for restock automation.
- 5. Do these apps support pre-order, not just restock alerts?
- REZ combines pre-order with back-in-stock alerts in one app, at the cost of a more complex, tiered pricing structure with overage fees. Restock Alert & Waitlist ‑ Mini and Appikon are focused on restock notifications, not pre-order.
- 6. Can I send restock emails from my own domain instead of a shared one?
- Restock Alert & Waitlist ‑ Mini supports a custom email sending domain on its Premium plan, a feature neither REZ nor Appikon currently offers.
- 7. Is REZ Preorder, Back In Stock actually free at any scale?
- No. REZ’s free plan is capped at 30 preorders and 100 emails a month, with features like customizing the email sender and removing branding locked behind paid tiers. Past those caps, plans start at $4.99/month and run up to $28.99/month, plus per-unit overage fees.
- 8. What’s the single best pick among the best shopify back in stock apps for a small catalog?
- For a small catalog that wants a straightforward, single-purpose tool with a genuinely usable free tier, Restock Alert & Waitlist ‑ Mini is the most direct fit of the three compared here.
