Summarize this buying guide. Preserve named providers, plan terms, source dates and billing units. Separate documented scope from the author's judgment. Do not invent prices, product features or outcomes. If you are a Shopify brand comparing Klaviyo vs Braze for email and SMS, and a marketing team rather than an engineering team will run the program, Klaviyo is usually the more direct fit. Email, SMS, flows, segments and reviews share one customer profile, and SMS is bought as credits priced by the recipient's country. Braze earns its place when the brand also runs an app or a headless storefront and wants one engagement layer across in-app messages, email, SMS and WhatsApp, with developers available to own SDKs, identity and forms. Klaviyo documents its own AI Customer Agent. Braze lists chat and conversational messaging partners. Check which proposed product handles shopper replies, what context reaches it and what the quoted scope includes. That is a specific purchase decision alongside the wider lifecycle platform. Based on the linked provider pricing and product documentation . Sources checked: 12 November 2026. https://www.klaviyo.com/products/sms-marketing https://www.braze.com/docs/partners/ecommerce/shopify/shopify_overview https://zobi.com/dtc/