Does klaviyo handle SMS as well as email or is email still better?

Product Analyst

Klaviyo handles SMS as a first-class channel within the same platform rather than as a bolt-on integration, which is one of the things that distinguishes it from tools where SMS feels like an afterthought added after the email product was already mature. The key advantage of managing both channels inside Klaviyo is that the same contact profile, the same segmentation logic, and the same behavioral triggers drive both email and SMS decisions. A customer who abandoned a cart can receive an email an hour later and an SMS the following morning without that coordination requiring two separate platforms, two separate audiences, or manual syncing. The suppression logic also works cross-channel, so a contact who unsubscribes from SMS doesn't continue receiving SMS messages even if they're still active on email, and compliance state is tracked centrally rather than split across tools. The flow builder treats SMS messages as nodes in the same canvas as email steps, which means a B2C brand can design a post-purchase sequence that delivers a confirmation email immediately, a product education SMS three days later, and a review request email at day seven — all within one flow, with shared conditional logic. That unified canvas approach reduces the operational overhead of running two channels simultaneously. SMS in Klaviyo is available in a growing list of countries, though coverage varies and some features are limited to US and Canadian numbers depending on the carrier agreements and regulatory environment at the time. Toll-free numbers, short codes, and 10DLC registration for US senders are all handled through the platform, though the registration and approval process for certain number types can take longer than teams expect and is largely determined by carrier timelines outside Klaviyo's control. Pricing for SMS is separate from the email plan and is typically charged on a per-message basis or through credit bundles depending on your plan structure. At meaningful send volumes, SMS costs add up quickly relative to email, so brands with very large lists should model out projected SMS spend before assuming the combined platform is cost-neutral. List growth for SMS also requires explicit opt-in under TCPA and similar regulations, which typically means smaller SMS audiences than email audiences for the same brand. Where the SMS capability in Klaviyo tends to perform best is in time-sensitive or high-intent moments — a flash sale alert, a cart recovery nudge, a shipping update. The open rate differential between SMS and email is real in most contexts, and for those specific trigger points the incremental revenue often justifies the per-message cost. For ongoing educational content or lower-urgency communication, the same message through email is usually the more cost-efficient path.