Klaviyo and Postscript are both email & sms marketing tools compared here on pricing verified 2026-10-01, published plans, App Store standing, and themes from recent merchant reviews. Both are priced in the same range — the decision comes down to features and fit. On the Shopify App Store, Klaviyo holds 4.7 ★ across 2,949 reviews and Postscript holds 4.7 ★ across 1,145. Klaviyo: These reviews suggest the app fits Shopify merchants looking for a robust email marketing tool with strong Shopify syncing and room to grow into segmentation features. Postscript: These reviews suggest the app fits merchants who want a mature Shopify SMS marketing platform with flows, segmentation, campaign tools, and hands-on support, especially if they are comfortable reviewing pricing and contract terms closely. — from tracked pricing and recent App Store review analysis.
$49 monthly minimum spend; $0.009/SMS and $0.045/MMS, plus carrier fees; includes 2 opt-in keywords.
Growth
$100
$0.008/SMS and $0.03/MMS, plus carrier fees; unlimited opt-in keywords.
Professional
$500
$0.007/SMS and $0.024/MMS, plus carrier fees.
Enterprise
—
Custom pricing; option to add RCS.
Postscript AI Plan
$699
Per-message rates range from $0.003 to $0.30 depending on the product and message type.
Prices are listed in USD. Listed SMS/MMS rates apply to the US (50 states) and Canada. Average US carrier fees are additional: SMS $0.00330, MMS $0.00799, text RCS $0.0047, and media RCS $0.0087.
Extracted from each vendor's App Store listing (2026-07-15);
"—" = not stated there. Verify tier availability on vendor pricing pages.
What do merchants say about them?
Klaviyo
Recent merchant sentiment is strongly positive, but much of the sample consists of ratings with minimal written explanation. Written comments most often highlight email marketing performance, Shopify integration, ease of use, and early revenue impact, while the clearest caveat is pricing for businesses in a growth phase.
＋Strong overall satisfaction — Most identifiable recent reviews are positive, with many merchants leaving high ratings even when they provide little written detail.
＋Email marketing effectiveness — Several merchants say the app works well for email marketing and helps support sales or revenue-generating campaigns.
＋Shopify integration — Merchants note that the app connects smoothly with Shopify and keeps store data in sync effectively.
＋Ease of use — Some newer users describe the interface as approachable and intuitive despite being early in setup.
－Pricing pressure — One merchant says costs rise sharply for growing businesses and recommends carefully modeling pricing before committing.
－Segmentation learning curve — One review notes that segmentation requires some learning before it becomes effective.
Watch out: Merchants should review pricing carefully as their contact list or business scale grows.
Synthesized from the 20 most recent App Store
reviews (2026-07-15); themes paraphrased.
Postscript
Sentiment in the scraped recent reviews is mixed: positive reviewers value Postscript for usable SMS marketing tools, list-building features, and strong support when it works well. However, the newest negative reviews cluster heavily around billing, pricing changes, cancellation terms, and deteriorating support responsiveness.
＋Responsive support — Positive reviewers often describe support as fast, helpful, friendly, and confidence-building during setup or troubleshooting.
＋Ease of use — Merchants praise the platform as intuitive for building flows, campaigns, segments, templates, and popups.
＋SMS growth and engagement — Some reviews credit the app with growing subscriber lists, improving customer engagement, and supporting sales activity.
＋Strong overall app quality — A few merchants describe the app as useful, sophisticated, or better than other SMS platforms they have tried.
－Unexpected fees — Many recent negative reviews focus on charges despite little or no usage, paid minimums, new monthly fees, or disputed service charges.
－Poor support experiences — Several merchants say support has become slow, unavailable, unhelpful, rude, or too dependent on automated responses.
－Contracts and cancellation — Multiple reviewers complain about contract lock-ins, renewal terms, cancellation confusion, buyout fees, or difficulty confirming account closure.
Watch out: The most common caveat is recurring frustration over unexpected charges, minimum fees, contract renewals, and cancellation or refund disputes.
Synthesized from the 18 most recent App Store
reviews (2026-07-15); themes paraphrased.
FAQ
Which is cheaper, Klaviyo or Postscript?
Both start at free (verified 2026-10-01).
Does Klaviyo or Postscript have a free plan?
Both offer free tiers.
Which is rated higher on the Shopify App Store?
Both hold 4.7 ★ (Klaviyo: 2,949 reviews; Postscript: 1,145).
How we compare: pricing and plans are collected automatically
from vendor pages on a schedule and shown with verification dates; ratings come
from the Shopify App Store; merchant sentiment is synthesized from the most
recent App Store reviews (paraphrased, never quoted). We currently have no
affiliate relationship with either vendor. Found an error?
The data snapshot behind this page is dated — check the vendor's page for
same-day changes.
Klaviyo
Postscript