Shopify app comparison · updated Sep 15, 2026
Klaviyo vs OptiMonk
Compare Klaviyo and OptiMonk for Shopify 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
OptiMonk
OptiMonk: AI Popup Builder
Popups that perfectly match your brand. Built in minutes. Designed to convert.
- Rating
- 4.80
- Reviews
- 459
- Review growth · 30d
- +40 · +9.5%
- Pricing
- Free plan available
- Years on Shopify
- 11
- Stores observed
- 1,565
Our read
Klaviyo has the stronger observed market footprint in OngoingAI's data — it appears on 43.3× more tracked stores and carries 7.2× the App Store review depth. Ratings and recent review growth are closer.
- Rating
- OptiMonk leads slightly4.8 vs 4.7
- Review growth
- Klaviyo faster+10.8% vs +9.5%
- Review depth
- Klaviyo7.2× more reviews
- Observed adoption
- Klaviyo43.3× 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.
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 | OptiMonk | Difference |
|---|---|---|---|
| Rating | 4.70 | 4.80 | OptiMonk +0.10 |
| Reviews | 3,293 | 459 | Klaviyo 7.2× |
| Review growth · 30d | +321 · +10.8% | +40 · +9.5% | Klaviyo faster |
| Listed pricing | Free to install | Free plan available | Not directly comparable |
| Years on Shopify | 14 | 11 | Klaviyo +3y |
| Stores observed | 67,821 | 1,565 | Klaviyo leads |
Review corpus
What merchants actually report.
Klaviyo
4.65 avg · 3,072 reviews
OptiMonk
4.84 avg · 422 reviews
| Signal | Klaviyo | OptiMonk | Difference |
|---|---|---|---|
| 5-star share | 89% | 93% | OptiMonk leads |
| Rating · last 90 days | 4.88 | 5.00 | OptiMonk leads |
| Replies to reviews | 49% | 71% | OptiMonk leads |
| Replies to critical (≤3★) | 53% | 88% | OptiMonk leads |
| Long-term reviewers (1yr+) | 43% | 8% | Klaviyo leads |
| Top market | United States 47% | United States 37% | — |
| Reviews analyzed | 3,072 | 422 | — |
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 Klaviyo if…
- You need email marketing
- You need email campaigns
- You need sms campaigns
- Recent review-growth signals matter to you
Choose OptiMonk if…
- You need sales pop-ups
- You need email pop-ups
- You need sms pop-ups
- A higher App Store rating is a priority
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 OptiMonk each do that the other doesn’t.
They cover largely the same ground — 40% of listed capabilities overlap. The decision material is the rest: what each lists that the other doesn’t.
Klaviyo only
24
- Email marketing
- Email campaigns
- SMS campaigns
- Push notifications
- Promotions
- Upsell emails
- Cross-sell emails
- Cart emails
- Checkout emails
- Browse abandonment
- Welcome emails
- Follow-up emails
- Price drop emails
- Back-in-stock emails
- Win-back emails
- Product recommendations
- Drip campaigns
- Subscriptions
- Product reviews
- Custom campaigns
- Bulk editing
- Import and export
- Email domains
- Consent collection
OptiMonk only
24
- Sales pop-ups
- Email pop-ups
- SMS pop-ups
- Cart pop-ups
- Spin the wheel
- Countdown timers
- Banners
- Announcements
- Games
- Surveys
- Quizzes
- Consent pop-ups
- Custom pop-ups
- Translation
- Campaigns
- Targeting
- Geolocation
- Segmentation
- Tagging
- Reporting
- Analytics
- A/B testing
- Tracking
- APIs and webhooks
16 shared capabilities
- Newsletters
- Pop-ups
- Forms
- Discounts
- Exit intent
- Abandoned cart
- Editor tool
- Templates
- AI generation
- Localization
- Custom code
- Custom fonts
- Email capture list
- 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.
Klaviyo
67,821
stores observed
Skews Shopify · 93%
OptiMonk
1,565
stores observed
Skews Shopify · 87%
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 OptiMonk.
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 OptiMonk, follow stack changes, and see when a store installs, removes, or replaces an app.