Shopify app comparison · updated Sep 16, 2026
Back In Stock,Notify Me vs Klaviyo
Compare Back In Stock,Notify Me and Klaviyo for Shopify using current ratings, review activity, pricing, features, and OngoingAI-observed adoption.
DEVSQUAT SOLUTIONS
Back In Stock,Notify Me: Kbite
Notify Customers with Restock Alert when items are back in stock & make out-of-stock waitlist
- Rating
- 5.00
- Reviews
- 4,126
- Review growth · 30d
- +263 · +6.8%
- Pricing
- Free plan available
- Years on Shopify
- 5
- Stores observed
- 2,265
Klaviyo
Klaviyo: Email Marketing & SMS
Build email marketing, SMS, and WhatsApp campaigns powered by AI to grow ecommerce sales.
- Rating
- 4.70
- Reviews
- 3,298
- Review growth · 30d
- +319 · +10.7%
- Pricing
- Free to install
- Years on Shopify
- 14
- Stores observed
- 69,072
Our read
Klaviyo has the stronger observed market footprint in OngoingAI's data — it appears on 30.5× more tracked stores. Ratings and recent review growth are closer.
- Rating
- Back In Stock,Notify Me leads5.0 vs 4.7
- Review growth
- Klaviyo faster+10.7% vs +6.8%
- Review depth
- Similar volume
- Observed adoption
- Klaviyo30.5× more tracked stores
Review trajectory
How each app's Shopify reviews are moving.
Daily App Store review counts since we began tracking — who's gaining reviews fastest, who holds the larger base, and how the race is developing.
Back In Stock,Notify Me leads total reviews, while Klaviyo is adding them faster over the tracked window.
Reviews each app has gained since the start of this tracking window. · Tracking window · Aug 18 – Sep 15, 2026
Head-to-head
The signals, side by side.
Each row reads straight from the live App Store listing and OngoingAI’s census. The Difference column states the gap — not a buyer recommendation.
| Dimension | Back In Stock,Notify Me | Klaviyo | Difference |
|---|---|---|---|
| Rating | 5.00 | 4.70 | Back In Stock,Notify Me +0.30 |
| Reviews | 4,126 | 3,298 | Back In Stock,Notify Me 1.3× |
| Review growth · 30d | +263 · +6.8% | +319 · +10.7% | Klaviyo faster |
| Listed pricing | Free plan available | Free to install | Not directly comparable |
| Years on Shopify | 5 | 14 | Klaviyo +9y |
| Stores observed | 2,265 | 69,072 | Klaviyo leads |
Review corpus
What merchants actually report.
Back In Stock,Notify Me
4.99 avg · 4,004 reviews
Klaviyo
4.66 avg · 3,077 reviews
| Signal | Back In Stock,Notify Me | Klaviyo | Difference |
|---|---|---|---|
| 5-star share | 99% | 89% | Back In Stock,Notify Me leads |
| Rating · last 90 days | 5.00 | 4.88 | Back In Stock,Notify Me leads |
| Replies to reviews | 1% | 49% | Klaviyo leads |
| Replies to critical (≤3★) | 67% | 53% | Back In Stock,Notify Me leads |
| Long-term reviewers (1yr+) | 4% | 43% | Klaviyo leads |
| Top market | United States 35% | United States 47% | — |
| Reviews analyzed | 4,004 | 3,077 | — |
Based on public merchant reviews, with newer feedback given more weight. OngoingAI matches each review to an identifiable store and the app they use.
Which fits your requirements?
Choose by what you actually need.
Choose Back In Stock,Notify Me if…
- You need stock alerts
- You need auto-alerts
- You need batch send
- A higher App Store rating is a priority
Choose Klaviyo if…
- You need email marketing
- You need email campaigns
- You need sms campaigns
- Recent review-growth signals matter to you
Tied to observable requirements only — listed capabilities, ratings, review growth, adoption and price. It doesn’t assert usability or support quality.
Feature differences
What Back In Stock,Notify Me and Klaviyo each do that the other doesn’t.
They cover largely the same ground — 3% of listed capabilities overlap. The decision material is the rest: what each lists that the other doesn’t.
Back In Stock,Notify Me only
19
- Stock alerts
- Auto-alerts
- Batch send
- Back in stock
- Multi-language
- SMS
- Out of stock
- Price drop
- Custom alerts
- Alert settings
- Notification templates
- Notification button
- Waitlists
- Customer demand
- Inventory reports
- Performance reports
- Inventory tracking
- Marketing - Other
Klaviyo only
39
- Email marketing
- Email campaigns
- SMS campaigns
- Push notifications
- Newsletters
- Forms
- Discounts
- Promotions
- Upsell emails
- Cross-sell emails
- Cart emails
- Checkout emails
- Exit intent
- Abandoned cart
- Browse abandonment
- Welcome emails
- Follow-up emails
- Price drop emails
- Back-in-stock emails
- Win-back emails
- Product recommendations
- Drip campaigns
- Subscriptions
- Product reviews
1 shared capabilities
- Pop-ups
Observed adoption
Who actually runs each, on real stores.
The stores OngoingAI’s weekly census observes running each app, and the platform each skews toward — observed presence, not vendor-reported install totals.
Back In Stock,Notify Me
2,265
stores observed
Skews Shopify · 100%
Klaviyo
69,072
stores observed
Skews Shopify · 93%
Scope
What this comparison measures.
What it measures
Shopify App Store ratings and review counts, rating distribution, developer reply rates, reviewer tenure and geography, listed pricing and capabilities, category data, and OngoingAI-observed storefront adoption for Back In Stock,Notify Me and Klaviyo.
What it doesn’t
Hands-on usability, customer-support quality, deliverability, merchant sentiment from review text, or revenue impact. We draw a sharp line around what we can observe.
Methodology
Where the numbers come from.
Ratings, review counts, pricing, and categories come from the live Shopify App Store listing, refreshed daily. Review growth compares the observed snapshots across the trailing 30-day window. “Stores observed” and the platform split come from OngoingAI’s weekly storefront census — the real stores running each app, not the listing’s claimed totals. Comparison generated Sep 16, 2026.
See who’s switching — as it happens.
Track app adoption on live ecommerce stores. Find merchants running Back In Stock,Notify Me or Klaviyo, follow stack changes, and see when a store installs, removes, or replaces an app.