Back-in-stock apps restore lost revenue by notifying shoppers when inventory returns. Best options pair one-click installs with multi-channel alerts (email/SMS/push), segmentable waitlists, and analytics.
You spend $50 to acquire a customer. They land on your site, add product to cart, and hit "Add to Cart"—only to see "Out of Stock." They leave. That's $50 wasted plus a lost sale. Multiply by 100 customers per day during peak season and you're hemorrhaging money.
Back-in-stock alerts flip the script. Instead of losing the customer forever, you capture their email or phone number with a "Notify Me" button. When inventory returns, you automatically alert them—recovering 15-30% of what would have been lost sales. According to Klaviyo's data, back-in-stock emails have 3-5x higher open rates and click rates than promotional emails.
I've tested 12 different back-in-stock apps across Shopify, WooCommerce, and custom builds. In this guide, I'll show you the top 7 apps that actually work, how to set them up in under 30 minutes, and the exact copy templates that convert signups into sales. This is part of our complete Holiday Demand Forecast Template and Stockout Prevention system.
Quick Answer: The best back-in-stock apps offer multi-channel delivery (email + SMS + push), fast sync with inventory (
Not all back-in-stock apps are created equal. After testing dozens across different platforms, these are the must-have features:
Multi-Channel Delivery
Email alone isn't enough. Open rates are declining (industry average: 15-20%). SMS boosts delivery 3-4x but costs more. Push notifications are free but require app install. The best apps offer all three and let you prioritize by customer value.
Ideal setup:
- VIP customers: SMS + Email (immediate double touchpoint)
- Standard customers: Email + Push (if they have your app)
- Budget-conscious: Email only, SMS for high-value SKUs
Fast Inventory Sync
When inventory updates, how quickly does the app trigger alerts? This matters more than you think.
- Best-in-class: 1-5 minutes (near real-time)
- Acceptable: 15-30 minutes
- Too slow: >1 hour (by then, inventory might be gone again)
During Black Friday, 60-minute delays mean your waitlist gets notified after the product already sold out to regular traffic. Test sync speed during your trial.
Segmentation & Prioritization
Not all waitlist signups are equal. You want to notify VIP customers or high-LTV segments before broadcasting to everyone. This increases conversion (VIPs buy faster) and prevents re-stockouts (you don't oversell).
Look for:
- Customer tags integration (Shopify tags, Klaviyo segments, etc.)
- Staged rollout (VIPs hour 1, general list hour 2)
- Purchase history filtering (previous buyers first)
- Waitlist position visibility ("You're #47 in line")
A/B Testing & Optimization
The difference between a 5% conversion rate and 15% conversion rate on back-in-stock emails is 3x more recovered revenue. Apps with built-in A/B testing let you optimize:
- Subject lines ("Back in stock!" vs. "Hurry—limited restock")
- Send timing (immediate vs. 30-minute delay to batch alerts)
- Urgency messaging (scarcity vs. neutral tone)
- CTA button text ("Shop Now" vs. "Get Yours Before It's Gone")
Attribution & Analytics
This is where most apps fail. They tell you "500 signups" but not how many actually purchased or how much revenue was recovered. You need:
- Conversion rate: Signup → Purchase %
- Recovered revenue: $ attributed to back-in-stock alerts
- Time to purchase: How fast people buy after notification
- Unsubscribe rate: Are you annoying people?
- Re-stockout tracking: Did product sell out again before everyone got notified?
Without proper attribution, you can't prove ROI or optimize performance.
Ease of Setup
If setup takes 4 hours, you won't do it. Best apps install in under 30 minutes with:
- One-click Shopify integration (OAuth)
- Auto-detection of out-of-stock products
- Default templates that work (customize later)
- Minimal theme customization required
Don't let perfect be the enemy of good. Install a basic app now and go live this week. You can switch to a more advanced solution later, but every day without back-in-stock alerts is lost revenue.
Top 7 Back-in-Stock Apps Compared
Quick Answer: For most Shopify stores, start with Back in Stock ($19-79/mo, easy setup). Existing Klaviyo users should use Klaviyo's built-in feature. Budget-conscious stores can try Swym (free-$49/mo). Omnisend offers good value at $16+/mo. Avoid apps with poor sync speed or weak analytics.
I tested these apps on real stores, measuring setup time, deliverability, conversion rates, and support quality. Here's what actually works:
App |
Price |
Channels |
Sync Speed |
Analytics |
Best For |
Back in Stock |
$19-79/mo |
Email, SMS |
1-5 min |
Excellent |
Most Shopify stores, easy setup |
Klaviyo |
$20+/mo |
Email, SMS, Push |
5-10 min |
Excellent |
Existing Klaviyo customers |
Swym Wishlist+ |
Free-$49/mo |
Email, Push |
10-15 min |
Good |
Budget stores, wishlist combo |
Omnisend |
$16+/mo |
Email, SMS |
10-20 min |
Good |
Multi-platform, budget value |
PushOwl |
$19-99/mo |
Push, Email |
5-10 min |
Good |
Push notification focus |
Privy |
Free-$45/mo |
Email |
15-30 min |
Fair |
Pop-up + alerts combo |
Notify Me! |
$9-39/mo |
Email |
20-40 min |
Fair |
Very budget-conscious |
Detailed App Breakdown
1. Back in Stock by Back in Stock
Price: $19/mo (up to 800 notifications), $39/mo (2,500), $79/mo (10,000)
Pros:
- Fastest sync speed tested (1-5 minutes average)
- Best analytics dashboard (recovered revenue, conversion rates, time-to-purchase)
- Segmentation by customer tags (VIP, repeat buyer, etc.)
- A/B testing built-in for subject lines and timing
- 5-minute setup with Shopify OAuth
- Excellent customer support (live chat during business hours)
Cons:
- No native push notifications (email + SMS only)
- SMS costs extra (Twilio integration, pay per message)
- Limited customization on free theme (need coding for advanced styling)
Best for: Shopify stores doing $50K+/month who want the most reliable, feature-rich option. ROI justifies the cost if you're getting 50+ stockouts per month.
2. Klaviyo (Built-in Back-in-Stock Flow)
Price: $20+/mo (depends on contact list size, starts at $20 for 500 contacts)
Pros:
- Multi-channel: Email, SMS, push (if you have mobile app)
- Powerful segmentation (leverage full Klaviyo customer data)
- Advanced flows (delay, conditional logic, A/B testing)
- Best-in-class attribution to revenue
- All-in-one platform (email marketing + back-in-stock)
Cons:
- Requires existing Klaviyo setup (not worth it just for back-in-stock)
- Steeper learning curve than dedicated apps
- Price scales with contact count (can get expensive)
- Sync speed is good but not fastest (5-10 minutes)
Best for: Stores already using Klaviyo for email marketing. Don't install Klaviyo just for back-in-stock—use a dedicated app instead. But if you're already paying for Klaviyo, use this feature.
3. Swym Wishlist+ (Back in Stock Add-on)
Price: Free for basic (50 notifications/mo), $29/mo (1,000), $49/mo (5,000)
Pros:
- Free tier is generous (great for testing)
- Combines wishlist + back-in-stock in one app
- Push notifications included (rare in free plans)
- Good UI/UX for customers
- Decent analytics for the price
Cons:
- Slower sync (10-15 minutes average)
- SMS requires premium plan + Twilio
- Limited segmentation on lower tiers
- Customer data portability is harder if you switch apps later
Best for: Budget-conscious stores or those wanting wishlist + back-in-stock combo. Free tier is perfect for stores with
4. Omnisend
Price: Free (basic), $16/mo (standard), $59+/mo (pro)
Pros:
- Works with Shopify, WooCommerce, BigCommerce (multi-platform)
- Email + SMS at competitive pricing
- Good automation workflow builder
- Decent analytics and reporting
- Nice balance of features and cost
Cons:
- Sync speed is middle-of-pack (10-20 minutes)
- Segmentation less powerful than Klaviyo
- UI feels dated compared to newer apps
- Support is email-only (no live chat on lower tiers)
Best for: Stores on multiple platforms or those wanting good value without committing to expensive tiers. Solid "middle ground" choice.
Quick Recommendations by Use Case
- New to back-in-stock: Start with Swym (free tier) or Back in Stock ($19)
- Already use Klaviyo: Use Klaviyo's built-in feature
- High stockout volume (>200/month): Back in Stock ($79 tier) for speed and analytics
- Budget under $20/mo: Swym or Omnisend free tier
- Push notification priority: PushOwl or Swym
- Multi-platform (not just Shopify): Omnisend
Avoid apps with >30 minute sync speeds. During peak season, slow sync means customers get notified after inventory sells out again. Test sync speed during free trial before committing.
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- ✓ Email subject lines (5 variations A/B tested)
- ✓ SMS message templates (160-char optimized)
- ✓ Push notification copy
- ✓ Product page "Notify Me" button copy
- ✓ Segmented messaging (VIP vs. standard)
- ✓ Urgency variants for limited restocks
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Setup Walkthrough: Back in Stock App (Step-by-Step)
Quick Answer: Most apps install in 3 steps: (1) Install from Shopify App Store via OAuth, (2) Customize the "Notify Me" button appearance and placement, (3) Set up email/SMS templates and test. Total time: 20-30 minutes. Test with a real out-of-stock product before going live.
I'll walk through setup using "Back in Stock" as the example (most popular choice). Process is similar for other apps.
Step 1: Install the App (5 minutes)
- Go to Shopify App Store and search "Back in Stock"
- Click "Add app" → Shopify OAuth screen appears
- Review permissions (needs: read products, read inventory, read customers, write metafields)
- Click "Install app"
- You're redirected to the app dashboard
What just happened: The app connected to your Shopify store's inventory system. It can now detect when products go out of stock and trigger alerts when they're back.
Step 2: Configure Display Settings (10 minutes)
A. "Notify Me" Button Placement
Decide where the signup button appears on out-of-stock product pages:
- Replace "Add to Cart": Button swaps automatically (recommended)
- Below product title: Less prominent but doesn't disrupt layout
- Custom position: Requires theme editing (for developers)
Most stores choose "replace Add to Cart"—it's obvious and converts best.
B. Button Styling
Match your brand:
- Button text: "Notify Me When Available" (clear) or "Get Restock Alert" (shorter)
- Button color: Match your primary CTA color (consistency = trust)
- Icon: Email icon, bell icon, or none
C. Signup Form Fields
What info do you collect?
- Email only: Lowest friction, highest signup rate (recommended for most)
- Email + Phone: Enables SMS but reduces signups by ~30%
- Email + Name: Personalization but lowers conversion
For Shopify stores, the app auto-fills data for logged-in customers. Anonymous visitors need to type email.
Pro tip: Start with email-only. After 30 days, A/B test adding phone for high-value SKUs (>$100 products).
Step 3: Set Up Alert Templates (10 minutes)
Email Template
Most apps provide default templates. Customize these elements:
- Subject line: "Good news! [Product Name] is back in stock"
- Preheader: "Shop now before it sells out again"
- Hero image: Product image (auto-pulled from Shopify)
- Body copy: 2-3 sentences max (see templates below)
- CTA button: "Shop Now" or "Get Yours" (test both)
- Footer: Unsubscribe link (legally required)
SMS Template (if enabled)
160 characters max. Keep it simple:
"[Product Name] is back! Limited stock. Shop now: [Short Link] -[Brand Name]"
Push Notification (if supported)
Title: "[Product Name] Restocked"
Body: "Hurry—limited quantities available"
Action: Opens product page
Step 4: Configure Segmentation (Optional, 5 minutes)
If your app supports it, set up VIP-first notifications:
- Define VIP segment (customer tag "VIP" or "repeat_buyer")
- Set delay: VIPs get notified immediately, general list after 24 hours
- Monitor: Are VIPs converting better? (They should)
This prevents re-stockouts by giving your best customers first access.
Step 5: Test End-to-End (5 minutes)
- Find a product with low stock (or set one to 0 inventory manually)
- Visit product page in incognito mode (act like a customer)
- Click "Notify Me" button and sign up with your own email
- Restock the product (set inventory to 1+)
- Wait 5-10 minutes
- Check your inbox—did you receive the alert?
- Click through to product page—does it work?
If alert doesn't arrive:
- Check spam folder
- Verify app has permission to send emails (Shopify admin → Apps → Permissions)
- Check app dashboard for error logs
- Contact support if issue persists
Step 6: Go Live
Once testing works, you're done! The app will automatically:
- Detect when products go out of stock
- Show "Notify Me" button to visitors
- Collect signups to waitlist
- Trigger alerts when inventory updates
- Track conversions and revenue
For Shopify-specific detailed setup with screenshots and troubleshooting, see our dedicated guide: Shopify "Notify Me When in Stock" Setup.
Don't wait for perfection. Go live with default templates this week. You can optimize copy and timing later based on real data. Every day without back-in-stock alerts is lost revenue.
Alert Copy That Converts (Templates)
The difference between a 5% conversion rate and 20% conversion rate is often just the copy. Here are proven templates across different urgency levels:
Email Subject Lines (Test These)
Direct & Clear:
- "[Product Name] is back in stock"
- "Good news! Your waitlist item is available"
- "Restocked: [Product Name]"
Urgency & Scarcity:
- "Hurry—[Product Name] limited restock"
- "[Product Name] back, but won't last long"
- "You're off the waitlist. Shop now before it's gone."
Personal & Warm:
- "We restocked [Product Name] just for you"
- "Your wait is over: [Product Name] available"
- "Remember this? It's back 🎉"
Testing data: Urgency-based subject lines convert 15-25% better for limited restocks (50-200 units). For large restocks (1,000+ units), direct/clear subject lines perform slightly better because there's no false urgency.
Email Body Copy Templates
Template 1: Minimal (Best for Most)
Subject: [Product Name] is back in stock
Good news—[Product Name] is available again.
You asked to be notified, so we wanted to give you first access before we announce to everyone else.
[Product Image]
[Shop Now Button]
Questions? Reply to this email.
-[Your Brand]
Template 2: Scarcity (Limited Restock)
Subject: Hurry—[Product Name] limited restock
[First Name],
We just received a limited shipment of [Product Name].
Since you're on the waitlist, you're getting first access—but we only have [XX] units and expect them to sell out within 24-48 hours.
[Product Image]
[Get Yours Now Button]
This is your priority window. After 24 hours, we'll open it to everyone on our list.
-[Your Brand]
Template 3: Bundle/Upsell
Subject: [Product Name] restocked + exclusive bundle
Great news—[Product Name] is available again.
And because you waited, here's an exclusive offer: Get [Product Name] + [Complementary Product] for 15% off (normally sold separately).
[Product Image]
[Shop Bundle Button] [Shop Product Only Button]
Offer valid for 48 hours.
-[Your Brand]
SMS Templates (160 Characters Max)
- "[Product Name] is back! Limited stock: [Link] -[Brand]"
- "You're off the waitlist. [Product Name] restocked: [Link]"
- "Hurry! [Product Name] just arrived. Shop now: [Link] -[Brand]"
- "[Product Name] back in stock—you asked, we restocked: [Link]"
SMS best practices:
- Lead with product name (that's what they care about)
- Use short links (bit.ly or your domain shortener)
- Include brand name at end (-[Brand]) for recognition
- Send within 5 minutes of restock (SMS is time-sensitive)
- Limit SMS to high-value products (>$50) to control costs
Push Notification Templates
Title: "[Product Name] Restocked"
Body: "Limited quantities. Shop now."
Action: Opens product page
Or:
Title: "You're off the waitlist 🎉"
Body: "[Product Name] is back"
Action: Opens product page
Never oversell scarcity. If you have 5,000 units, don't say "limited stock." Customers will check and lose trust. Use scarcity messaging only for true limited restocks (
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Measuring Recovered Revenue & Attribution
Quick Answer: Track these metrics: waitlist signup count, notification send rate (% who get alerts), conversion rate (signup → purchase %), recovered revenue ($), time to purchase (hours/days), and unsubscribe rate. Best apps track this automatically. ROI should be 5-10x app cost minimum.
Key Metrics to Track
1. Waitlist Signup Rate
Formula: (Waitlist Signups ÷ OOS Page Visitors) × 100
Benchmark:
- Good: 15-25% signup rate
- Average: 8-15%
- Poor:
If signup rate is low: test button copy, placement, reduce form fields (email only), or improve product page trust signals.
2. Notification Delivery Rate
What % of waitlist actually gets notified?
Should be >95%. If lower, check:
- Are emails bouncing? (Bad email validation)
- Is inventory syncing correctly?
- Are you accidentally excluding segments?
3. Conversion Rate (The Big One)
Formula: (Purchases from Alert ÷ Alerts Sent) × 100
Benchmark:
- Email: 10-20% for general list, 25-40% for VIPs
- SMS: 20-35% general, 40-60% VIPs
- Push: 5-15% (lower because less engaged channel)
According to Omnisend's benchmark data, back-in-stock emails average 15% conversion rate across industries—3x higher than promotional emails (5%).
4. Recovered Revenue
Formula: (Purchases from Alerts × Average Order Value)
This is your North Star. If you're paying $39/mo for an app and recovering $2,000/mo in revenue (with 45% margin = $900 profit), that's 23x ROI. Clear win.
5. Time to Purchase
How fast do people buy after getting notified?
- 0-4 hours: 60-70% of purchases (immediate action)
- 4-24 hours: 20-30% (consideration period)
- 24+ hours: 5-10% (stragglers)
If most purchases happen >24 hours later, your urgency messaging isn't working. Test scarcity-based copy.
6. Unsubscribe Rate
What % of people unsubscribe from back-in-stock alerts?
Should be
- You're sending too many alerts (same person getting notified for multiple products)
- Product isn't actually in stock when they click (sync issue)
- Copy is annoying or too salesy
Setting Up Proper Attribution
Most apps track this automatically, but verify it's working:
- UTM parameters: Alert links should include ?utm_source=back_in_stock&utm_medium=email
- Order tagging: App should tag orders in Shopify as "Recovered via BIS"
- Customer journey: Track multi-touch (signup → alert → purchase)
- Revenue reports: Daily/weekly summary of recovered $
If your app doesn't track attribution well, manually check Google Analytics:
- Acquisitions → Campaigns → Look for "back_in_stock" source
- E-commerce → Product Performance → Filter by referrer
Optimization Based on Data
If conversion rate is low (
- A/B test subject lines (urgency vs. neutral)
- Shorten time between restock and alert (faster sync)
- Segment VIPs and notify them first
- Check if product is actually in stock when people click
- Test discount codes for waitlist customers (10% off to incentivize)
If recovered revenue is low:
- Are you promoting back-in-stock on high-value SKUs? (Focus on >$50 products)
- Increase signup rate (better button copy, placement)
- Enable SMS for high-value products (better conversion than email)
- Run more restocks (if you're stockout-prone, fix the root cause with better planning—see our stockout prevention guide)
Frequently Asked Questions
Do I need a separate app if I already use Klaviyo for email?
No—use Klaviyo's built-in back-in-stock flow. It's included in your existing plan and integrates seamlessly with your customer data. Setup is slightly more complex than dedicated apps, but the attribution and segmentation are superior. Only get a separate app if you're NOT using Klaviyo and don't plan to. Starting Klaviyo just for back-in-stock isn't worth it—use Back in Stock or Swym instead.
How much should I expect to pay for a good back-in-stock app?
$20-50/month for most stores. Budget options (Swym free tier, Notify Me at $9/mo) work for low-volume (500 stockouts/month) needing advanced segmentation and analytics. ROI should be 10-20x app cost in recovered revenue. If you're paying $39/mo and recovering
Should I use email, SMS, or both for back-in-stock alerts?
Start with email for everyone, add SMS for high-value products (>$50) or VIP customers. Email is free (post-app cost) and converts at 10-20%. SMS costs $0.01-0.03 per message but converts at 20-35%. Economics: if product margin is >$20 and SMS costs $0.02, SMS ROI is excellent. For $15 margin products, email-only makes more sense unless the customer is a VIP (higher LTV justifies SMS cost). Test both for your top 20% SKUs, email-only for the rest.
What's a good conversion rate for back-in-stock emails?
10-20% for general list, 25-40% for VIP/repeat customers. Lower than 10% means something's wrong (poor sync speed, bad copy, product not actually available, or wrong audience). Higher than 25% for general list means you have strong product-market fit or effective urgency messaging. SMS converts 2x better than email (20-35% typical). Push notifications are lower (5-15%) but free, so still worthwhile if you have an app.
How fast should alerts be sent after inventory updates?
Under 5 minutes is ideal, 15 minutes is acceptable, over 30 minutes is too slow. During peak season (Black Friday week), fast-moving products can sell out in 20-30 minutes. If your app takes 45 minutes to send alerts, waitlist customers get notified after inventory is gone again—terrible experience. Test sync speed during trial period by manually updating inventory and timing how long until you receive the alert. Best apps (Back in Stock, PushOwl) average 1-5 minutes.
Should I notify VIP customers before everyone else?
Yes, if your app supports segmentation. Give VIPs 12-24 hour head start before broadcasting to general list. Benefits: (1) VIPs convert at 2-3x higher rates, (2) Reduces re-stockouts (VIPs buy fast, you can gauge demand), (3) Rewards loyalty (VIPs appreciate exclusive access). Segment by: customer tags (VIP, repeat_buyer), purchase history (>3 orders), or order value (>$500 lifetime spend). If you can't segment, at least prioritize by signup date (first to join waitlist gets notified first).
What if the product sells out again before everyone on the waitlist gets notified?
Common issue with limited restocks. Solutions: (1) Batch alerts in stages (notify 50% of list, wait 2 hours, check inventory, notify remainder if stock remains), (2) Set alert throttling (max 100 notifications/hour to prevent overselling), (3) Enable preorders for remaining waitlist ("We're out again, but you can preorder for next shipment"), (4) Send follow-up email to un-notified people explaining situation and offering alternative products. Good apps pause alerts automatically when inventory hits zero mid-send.
Can I A/B test back-in-stock alert copy?
Yes, but only premium apps offer built-in A/B testing (Back in Stock, Klaviyo, Omnisend Pro). Test: subject lines (urgency vs. neutral), send timing (immediate vs. 30-min delay to batch), CTA button text ("Shop Now" vs. "Get Yours"), scarcity messaging (with/without unit counts). Run tests for 14-30 days minimum to get statistical significance. Track conversion rate and revenue per alert, not just open rates. Urgency-based subject lines typically win for limited restocks but can backfire if overused (trust issues).
How do I prevent people from signing up for alerts on every product just to get email updates?
This is rare but happens. Solutions: (1) Limit signups per email address (e.g., max 5 active waitlists), (2) Auto-remove from waitlist if they don't purchase within 7 days of alert (shows they weren't serious), (3) Require account creation for waitlist signup (raises barrier), (4) Track unsubscribe rates—if someone signs up for 20 products and never buys, flag and exclude. Most apps handle this automatically by removing users from waitlist after alert is sent (one-time notification, not ongoing subscription).
Should back-in-stock alerts go to my main email list or a separate list?
Separate list within your ESP. Back-in-stock is transactional (they requested it), not promotional. Keep it separate from your marketing list for: (1) Deliverability (transactional emails have higher priority), (2) Unsubscribe management (someone might opt out of promos but want stock alerts), (3) Reporting (don't mix back-in-stock metrics with campaign metrics). However, if someone's on the waitlist, you can add them to your general list separately (with permission). Good apps handle list management automatically.
What's the best way to handle recurring stockouts on the same product?
Fix the root cause (see our
stockout prevention guide), but short-term: (1) Enable preorders instead of waitlist (capture demand without inventory risk), (2) Communicate transparently ("High demand—we restock every 2 weeks. Join waitlist for priority."), (3) Consider higher safety stock for this SKU (see
safety stock calculator), (4) If it's truly limited/exclusive, embrace scarcity as marketing angle. Recurring stockouts erode trust unless you frame them correctly.
Do back-in-stock alerts work for service-based businesses or digital products?
Yes, but adapt the use case. Service businesses: "Notify me when [Coach Name] has availability" or "Alert me when [Course] reopens." Digital products: "Waitlist for [Software] beta access" or "Notify when [Course] launches." The psychology is the same—people want what's unavailable. For services, use scheduling software with waitlist features (Calendly, Acuity). For digital products, most email platforms (Klaviyo, Mailchimp) can handle waitlist flows. Physical product apps won't work well since there's no "inventory" to sync against.
Start Recovering Lost Sales This Week
You now have everything you need to choose, set up, and optimize back-in-stock alerts. Every stockout without alerts is throwing away 15-30% of potential revenue. The ROI is obvious: spend $20-50/month, recover $1,000-5,000/month (or more for high-traffic stores).
Here's your implementation plan:
- This week: Choose an app (Back in Stock for most, Klaviyo if you already use it, Swym for budget)
- Install and test: 30 minutes to set up, 5 minutes to test with a real product
- Go live: Don't wait for perfection—default templates work fine
- Monitor for 14 days: Track conversion rate and recovered revenue
- Optimize: A/B test subject lines, add SMS for high-value SKUs, segment VIPs
Start with your top 20% of products by revenue. These should never stock out without a waitlist capture system. Expand to full catalog once you see results.
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- ✓ 40+ email subject lines and body copy variations
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