Shopify app comparison · refreshed
Klaviyo vs Postscript SMS Marketing
Two Shopify apps compared on the dimensions merchants actually weigh: ratings, review momentum, pricing, customer-support sentiment, bugs, and what reviewers uniquely call out. Built from 4,119 live Shopify App Store reviews.
Klaviyo
Klaviyo: Email Marketing & SMS
AI marketing and customer service automation for email marketing, SMS, and WhatsApp to grow faster.
- Rating
- 4.70
- Reviews
- 2,996
- Δ reviews · 49d
- +204
- Δ rating · 49d
- +0.10
- Pricing
- From $15/mo
- Built for Shopify
- No
Postscript
Postscript SMS Marketing
Create and execute SMS programs to drive incremental revenue by engaging customers via text message
- Rating
- 4.70
- Reviews
- 1,123
- Δ reviews · 46d
- -10
- Δ rating · 46d
- +0.00
- Pricing
- From $100/mo
- Built for Shopify
- No
Scorecard
The decision, by the numbers.
Each row reads directly from the live App Store listing and the observed review-stats history. No editorialising on top.
Trajectory
Momentum and risk profile.
Review momentum
Reviews gained since first observed snapshot · past 49d
Star distribution
Share of reviews at each star tier — wider 1- and 2-star bands read as a fatter tail of negative experiences.
Klaviyo
2,996 reviews
Postscript SMS Marketing
1,123 reviews
Feature footprint
How similar are these apps, really?
Every capability tag both apps list on the Shopify App Store, mapped into shared ground and side-specific edges. Same taxonomy on both sides — Shopify’s own.
Klaviyo only
58
Shared
10
Postscript SMS Marketing only
4
Capabilities by Shopify category
72 · 16 total
Managing campaigns
Email marketing
Campaign types
Email marketing
Workflow automation
SMS marketing
Display options
Abandoned cart
Cart recovery
Abandoned cart
Klaviyo only
58
- Email campaigns
- SMS campaigns
- Push notifications
- Newsletters
- Pop-ups
- 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
- Custom campaigns
- Editor tool
- AI generation
- Localization
- Custom code
- Custom fonts
- Bulk editing
- Import and export
- Email domains
- Consent collection
- Email capture list
- SMS capture list
- Triggers and rules
- Automations
- Targeting
- Geolocation
- Tagging
- Tracking
- Reporting
- Insights and tips
- Analytics
- APIs and webhooks
- Bulk messaging
- Custom sender ID
- Conversion metrics
- Real-time analytics
- ROI tracking
- Custom segments
- Birthday messages
- Discount codes
- Feedback requests
- Order confirmations
- Order tracking
- Win-back campaigns
Shared
10
- Templates
- Segmentation
- A/B testing
- Compliance
- Personalized messages
- Scheduled messages
- Two-way messaging
- Opt-in
- Cart recovery
- Welcome messages
Postscript SMS Marketing only
4
- SMS notifications
- Pop-up builder
- Triggers
- One-time password (OTP)
Side-by-side by axis
What merchants actually say.
Semantic search across the review corpus, bucketed by sentiment, with the strongest positive and negative quotes per side.
customer support
Klaviyo
89% positive · avg rating 4.59
“Best customer service support chat. They are always willling to help!”
“every time you contact the chat it is 8 hours, and they are not fully trained and don't have an answer to any technical issue so you have to close and start a new chat hopping you'll get somebody else! no tel support.”
Postscript SMS Marketing
100% positive · avg rating 4.98
“Customer support has been very helpful although at the beginning they couldn't figure out the issue I was having”
pricing
Klaviyo
0% positive · avg rating 1.00
“False pricing plan. If you open pricing plan from the app page, then you will see that you can buy 20$ plan with 5000 emails. However, after installation I've tried to update plan, and the cheapest version is for 140$ only!”
Postscript SMS Marketing
0% positive · avg rating —
No standout quotes yet — corpus is still warming.
ease of use
Klaviyo
100% positive · avg rating 4.99
“Intuitive and easy to use for someone that is new to e-commerce.”
Postscript SMS Marketing
100% positive · avg rating 4.95
“I really appreciate how quick and easy it is to use as well as the variety of features available! :)”
onboarding
Klaviyo
33% positive · avg rating 2.67
“A little rocky of a start in the learning process. I think It's a great process but scheduling in time to really understand the interface is important and an investment. Would recommend for serious entrepreneurs”
“When I speak with reps from other apps they rave about Klaviyo, but I'm guessing they have not gone through the onboarding process. We were assigned an onboarding specialist, but they don't help you much with the technical stuff. She's just a project manager, essentially who assigns all the tasks to you. Really great sales pitch, but you feel high and dry after you've signed up. Update: Their documentation is really awful.”
Postscript SMS Marketing
100% positive · avg rating 4.91
“I just started my onboarding, and the service has been friendly, fast, and helpful. I would recommend using this service!”
bugs
Klaviyo
100% positive · avg rating 4.80
No standout quotes yet — corpus is still warming.
Postscript SMS Marketing
0% positive · avg rating —
No standout quotes yet — corpus is still warming.
performance
Klaviyo
100% positive · avg rating 4.94
No standout quotes yet — corpus is still warming.
Postscript SMS Marketing
0% positive · avg rating —
No standout quotes yet — corpus is still warming.
What each is known for
Themes reviewers raise.
The topics that surface most across reviews — the shared backbone and what each app is uniquely known for.
Klaviyo
- customer-support223
- pricing131
- ease-of-use49
- onboarding34
- bugs31
- bug26
- performance25
- billing-issues24
Uniquely onboarding · bugs · bug · performance · missing-features
Postscript SMS Marketing
- customer-support25
- pricing16
- ease-of-use5
- billing5
- billing-issues3
- transparency2
- billing-issue2
- communication2
Uniquely transparency · billing-issue · communication · roi · product-reliability
Shared themes
Same Shopify categories
Methodology
Where the numbers come from.
Ratings, review counts, pricing, and the “Built for Shopify” flag come from the live Shopify App Store listing — refreshed daily. Trend deltas compare the snapshot from 365 days ago against today. Sentiment counts and quotes are derived from semantic search across the live review corpus, bucketed by rating sign — every quote on this page is a real review, not a paraphrase. Snapshot generated .
Watch the next stack change as it happens.
Ongoing.AI tracks every Shopify brand’s app stack daily. Find the merchants running Klaviyo or Postscript SMS Marketing, and the moment they switch.