Shopify app comparison · refreshed
Klaviyo vs Postscript SMS Marketing
Two of the largest print-on-demand apps in the Shopify ecosystem, compared on the dimensions merchants actually weigh: ratings, review-count momentum over the last year, pricing, customer-support sentiment, bugs, and what reviewers uniquely call out. Built from 4,044 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
- 2,921
- 12-mo Δ reviews
- +129
- 12-mo Δ rating
- +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
- 12-mo Δ reviews
- -10
- 12-mo Δ rating
- +0.00
- Pricing
- From $100/mo
- Built for Shopify
- No
What the data says
Klaviyo carries the rating edge (0.00 stars). Klaviyo added more reviews last year.
Both apps live in the same Shopify category but merchants describe them differently. Klaviyo reviewers disproportionately call out integration depth and predictable fulfillment; Postscript SMS Marketing reviewers disproportionately call out provider choice and unit-cost pricing. The decision usually comes down to which one of those two failure modes hurts your business more.
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
0% positive · avg rating —
No standout quotes yet — corpus is still warming.
Postscript SMS Marketing
91% positive · avg rating 4.63
“Very Helpful with all my problems and very quick to answer my questions didnt have to set there and wait a long time. Great customer support!!!!”
“Tedious to navigate. Customer service lacking, usually takes days and several reps, to answer most simplest concerns.”
pricing
Klaviyo
0% positive · avg rating —
No standout quotes yet — corpus is still warming.
Postscript SMS Marketing
0% positive · avg rating —
No standout quotes yet — corpus is still warming.
ease of use
Klaviyo
0% positive · avg rating —
No standout quotes yet — corpus is still warming.
Postscript SMS Marketing
100% positive · avg rating 5.00
“Super user friendly, and I greatly appreciate the tech support that seems to answer within ~2 minutes no matter what time it is. It's really helpful as we learn how to best use this platform and much easier to get in touch with than other platforms we have.”
onboarding
Klaviyo
0% positive · avg rating —
No standout quotes yet — corpus is still warming.
Postscript SMS Marketing
0% positive · avg rating —
No standout quotes yet — corpus is still warming.
bugs
Klaviyo
0% positive · avg rating —
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
0% positive · avg rating —
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
- product-reliability2
Uniquely transparency · billing-issue · product-reliability · communication · roi
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.