Shopify app comparison · updated Sep 15, 2026
Klaviyo vs Sendlane
Compare Klaviyo and Sendlane for Shopify email marketing using current ratings, review activity, pricing, features, and OngoingAI-observed adoption.
Klaviyo
Klaviyo: Email Marketing & SMS
Build email marketing, SMS, and WhatsApp campaigns powered by AI to grow ecommerce sales.
- Rating
- 4.70
- Reviews
- 3,293
- Review growth · 30d
- +321 · +10.8%
- Pricing
- Free to install
- Years on Shopify
- 14
- Stores observed
- 67,821
Sendlane
Sendlane: Unified Email & SMS
Sendlane is the unified email, SMS, & forms platform for eCommerce marketing and automation.
- Rating
- 4.20
- Reviews
- 14
- Review growth · 30d
- +2 · +16.7%
- Pricing
- Free plan available
- Years on Shopify
- 5
- Stores observed
- No footprint yet
What stands out
Klaviyo carries 219.6× the App Store review depth; the other measurable signals are close.
- Rating
- Klaviyo leads4.7 vs 4.2
- Review growth
- Sendlane faster+16.7% vs +10.8%
- Review depth
- Klaviyo219.6× more reviews
- Observed adoption
- Not comparable yet
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.
Klaviyo leads total reviews and is adding them fastest over the tracked window.
Reviews each app has gained since the start of this tracking window. · Tracking window · Aug 17 – Sep 14, 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 | Klaviyo | Sendlane | Difference |
|---|---|---|---|
| Rating | 4.70 | 4.20 | Klaviyo +0.50 |
| Reviews | 3,293 | 14 | Klaviyo 219.6× |
| Review growth · 30d | +321 · +10.8% | +2 · +16.7% | Sendlane faster |
| Listed pricing | Free to install | Free plan available | Not directly comparable |
| Years on Shopify | 14 | 5 | Klaviyo +9y |
| Stores observed | 67,821 | No footprint yet | Not comparable |
Which fits your requirements?
Choose by what you actually need.
Choose Klaviyo if…
- You need push notifications
- You need forms
- You need promotions
- A higher App Store rating is a priority
Choose Sendlane if…
- You need targeting
- You need segmentation
- You need tagging
- 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 Klaviyo and Sendlane each do that the other doesn’t.
They cover largely the same ground — 70% of listed capabilities overlap. The decision material is the rest: what each lists that the other doesn’t.
Klaviyo only
12
- Push notifications
- Forms
- Promotions
- Subscriptions
- Product reviews
- AI generation
- Localization
- Bulk editing
- Import and export
- Email domains
- Consent collection
- Email capture list
Sendlane only
12
- Targeting
- Segmentation
- Tagging
- Tracking
- Reporting
- Analytics
- A/B testing
- SMS marketing
- Bulk messaging
- Scheduled messages
- Conversion metrics
- ROI tracking
28 shared capabilities
- Email marketing
- Email campaigns
- SMS campaigns
- Newsletters
- Pop-ups
- Discounts
- 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
- Custom campaigns
- Editor tool
- Templates
- Custom code
- Custom fonts
- SMS capture list
- Triggers and rules
- Automations
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.
Adoption comparison unavailable — a publishable footprint exists for only one app.
Klaviyo
67,821
stores observed
Skews Shopify · 93%
Sendlane
No reliable footprint yet
OngoingAI hasn’t observed enough high-confidence installations to publish an adoption count. This does not mean zero installations.
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 Klaviyo and Sendlane.
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 15, 2026.
See who’s switching — as it happens.
Track app adoption on live ecommerce stores. Find merchants running Klaviyo or Sendlane, follow stack changes, and see when a store installs, removes, or replaces an app.