Klaviyo 1-star reviews: what merchants complain about
51 one- and two-star Shopify App Store reviews with text (46 one-star) of Klaviyo: Email Marketing & SMS, Email & SMS marketing category, posted 29 Oct 2025 – 19 Oct 2026.
What the reviews complain about
| Complaint | Share | Reviews | All apps |
|---|---|---|---|
| Slow or no support | 37.3% | 19 | 31.2% |
| Charges & refunds | 21.6% | 11 | 13.9% |
| Too expensive for what it does | 19.6% | 10 | 4.7% |
| Bugs & broke the store | 17.6% | 9 | 17.9% |
| Hard to use or set up | 15.7% | 8 | 9.1% |
| Called it a scam or misleading | 7.8% | 4 | 5.8% |
| Export, import & migration pain | 3.9% | 2 | 6.4% |
| Price increases & plan changes | 3.9% | 2 | 0.7% |
| Charged after uninstalling/cancelling | 2% | 1 | 1.4% |
| Missing features & limits | 2% | 1 | 3.1% |
| Slow store & app speed | 2% | 1 | 2.7% |
A review can match several themes; 23.5% match none. All apps: 2,418 low-star reviews of 192 Shopify apps in the study.
In merchants’ words
“… When encountering technical issues with dynamic variables in templates, there is absolutely no way to get basic support unless you upgrade to a paid plan.”
Shopify App Store review, Aug 2026
“… That guidance resulted in service interruption and an accelerated billing cycle.”
Shopify App Store review, Jan 2026
“Crazy expensive app If you are mid or small size business try something else before you fell like us!”
Shopify App Store review, Oct 2026
“… I can’t keep ahold of any one in support until I upgrade and pay a monthly fee or lower the amount of emails in my account which is not working.”
Shopify App Store review, Apr 2026
“… Support isn’t helpful; they write long messages that don’t make sense and refer you to confusing FAQs.”
Shopify App Store review, Jul 2026
Developer replies
47 of 51 got a developer reply (92.2%), median 1 day after the review. All apps in the study: 43.9%.
Time on the app before the review
| Time used | Reviews | Share |
|---|---|---|
| Under 1 day | 4 | 7.8% |
| 1–7 days | 6 | 11.8% |
| 8–30 days | 4 | 7.8% |
| 1–12 months | 21 | 41.2% |
| Over 1 year | 16 | 31.4% |
Email & SMS marketing category: shared complaints
AppGap reads the recent 1–3★ merchant reviews of the top ~10 apps in your Shopify App Store category and ranks the complaints they share, with real quotes. One PDF by email within 24–48 h.
Get my category report – €19Sample PDF · AppGap
€19 €39 one-off, launch price until 30 Nov 2026 or the first 20 orders. Full refund if we can’t produce a useful report.
Same category: Shopify Flow · Orderly Emails · Omnisend · Shopify Messaging
Data and method: Shopify App Store review study · Shopify app bad reviews: what to fix first · All app and plugin pages