Shopify app comparison · updated Aug 25, 2026

KlaviyovsOptiMonk

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: 3,007
Review growth · 30d: +54 · +1.8%
Pricing: Free to install
Years on Shopify: 14
Stores observed: 34,345

Full analysis App Store

OptiMonk

OptiMonk: AI Popup Builder

Popups that perfectly match your brand. Built in minutes. Designed to convert.

Rating: 4.80
Reviews: 420
Review growth · 30d: +3 · +0.7%
Pricing: Free plan available
Years on Shopify: 11
Stores observed: 747

Full analysis App Store

Our read

Ratings: OptiMonk higher (4.80 vs 4.70)
Review growth: Klaviyo faster (+1.8% vs +0.7%)
Review depth: Klaviyo 7.1× more reviews
Adoption: Klaviyo larger (34,345 vs 747)

OngoingAI's data favors Klaviyo on observed Shopify adoption (34,345 vs 747 stores), backed by a larger review base.

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	3,007	420	Klaviyo 7.1×
Review growth · 30d	+54 · +1.8%	+3 · +0.7%	Klaviyo faster
Listed pricing	Free to install	Free plan available	Not directly comparable
Years on Shopify	14	11	Klaviyo +3y
Stores observed	34,345	747	Klaviyo leads

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

40% of listed capabilities overlap.

These apps cover largely the same ground. The decision material is what each lists that the other doesn’t.

Klaviyo only

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

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

Show 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

34,345

stores observed

Skews Shopify · 89%

OptiMonk

747

stores observed

Skews Shopify · 82%

Scope

What this comparison measures.

What it measures

Shopify App Store ratings, review counts and 30-day review growth, 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.

Still comparing?

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 Aug 25, 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.