Klaviyo SMS is one of the fastest-growing channels in the platform. With 98% open rates and average response times under 3 minutes, SMS marketing paired with email creates an omnichannel strategy that significantly outperforms either channel alone.
Why Add SMS to Your Klaviyo Strategy
SMS messages are read almost immediately and have conversion rates 3–5x higher than email for time-sensitive offers. When used strategically (not excessively), Klaviyo SMS adds 5–15% incremental revenue on top of your existing email performance without cannibalizing email results.
Building Your Klaviyo SMS List
Growing an SMS list requires explicit opt-in due to TCPA and GDPR regulations. Use Klaviyo’s built-in SMS consent collection on signup forms, checkout opt-in, post-purchase follow-up, and keyword opt-in (text “JOIN” to your number). Never add customers to SMS without explicit consent — compliance is critical.
SMS Flow Integration with Email
The most effective Klaviyo SMS strategy integrates text messages into existing email flows. Add SMS as a second touch in your abandoned cart flow (send 2 hours after the first email), use SMS for flash sale alerts, send shipping updates via text, and trigger SMS winback messages for lapsed customers who aren’t opening emails.
Klaviyo SMS Compliance
Always include opt-out language (“Reply STOP to unsubscribe”) in every message. Honor opt-outs within 10 business days (though Klaviyo handles this automatically). Avoid sending between 9pm–8am in the recipient’s time zone. Keep promotional messages to 2–4 per month maximum to avoid fatigue.
Writing Effective Klaviyo SMS Messages
Klaviyo SMS messages must be concise (160 characters for single-part), include your brand name (recipients may not have your number saved), have a clear single CTA with a short link, and create genuine value or urgency. Avoid generic messages — personalization (“Hey Sarah, your cart is expiring”) dramatically improves conversion rates.
Measuring Klaviyo SMS ROI
Track SMS-specific metrics in Klaviyo: opt-in rate, opt-out rate, click rate (target 15–25%), conversion rate, and revenue per SMS sent. Most brands see $0.15–$0.50 revenue per SMS send. Factor in per-message costs ($0.01–$0.02) to calculate true ROI, which typically exceeds 1000%.