Shopify app comparison · refreshed

Sendlane vs Klaviyo

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 2,935 live Shopify App Store reviews.

Sendlane

Sendlane: Unified Email & SMS

Sendlane is the unified email, SMS, & forms platform for eCommerce marketing and automation.

Rating
4.50
Reviews
14
12-mo Δ reviews
-1
12-mo Δ rating
+0.20
Pricing
From $600/mo
Built for Shopify
No

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

What the data says

Klaviyo carries the rating edge (0.20 stars). Klaviyo added more reviews last year.

Both apps live in the same Shopify category but merchants describe them differently. Sendlane reviewers disproportionately call out integration depth and predictable fulfillment; Klaviyo 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

Sendlane

0 mentions

0% positive · avg rating —

No standout quotes yet — corpus is still warming.

Klaviyo

0 mentions

0% positive · avg rating —

No standout quotes yet — corpus is still warming.

pricing

Sendlane

0 mentions

0% positive · avg rating —

No standout quotes yet — corpus is still warming.

Klaviyo

0 mentions

0% positive · avg rating —

No standout quotes yet — corpus is still warming.

ease of use

Sendlane

0 mentions

0% positive · avg rating —

No standout quotes yet — corpus is still warming.

Klaviyo

0 mentions

0% positive · avg rating —

No standout quotes yet — corpus is still warming.

onboarding

Sendlane

0 mentions

0% positive · avg rating —

No standout quotes yet — corpus is still warming.

Klaviyo

0 mentions

0% positive · avg rating —

No standout quotes yet — corpus is still warming.

bugs

Sendlane

0 mentions

0% positive · avg rating —

No standout quotes yet — corpus is still warming.

Klaviyo

0 mentions

0% positive · avg rating —

No standout quotes yet — corpus is still warming.

performance

Sendlane

0 mentions

0% positive · avg rating —

No standout quotes yet — corpus is still warming.

Klaviyo

0 mentions

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.

Sendlane

    Klaviyo

    • customer-support223
    • pricing131
    • ease-of-use49
    • onboarding34
    • bugs31
    • bug26
    • performance25
    • billing-issues24

    Uniquely customer-support · pricing · ease-of-use · onboarding · bugs · bug · performance · billing-issues · missing-features · billing

    Same Shopify categories

    Email marketingSMS marketing

    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 Sendlane or Klaviyo, and the moment they switch.

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