Which is better for e-commerce CRM: email or LINE? A practical guide to effective use and combined design

Which should you choose as your e-commerce CRM channel, email or LINE? To get straight to the point, rather than "choosing one or the other," the most effective approach is a combined strategy that understands the characteristics of both and assigns specific roles to each. As a guideline, LINE is suitable for immediate announcements and customer service, while email is better for automated scenarios, conveying brand identity, and serving as a pillar of sales. This article, based on Yulie's on-the-ground expertise in supporting CRM operations for Shopify x Klaviyo, will numerically compare the differences between the two channels and concretely explain how to use them selectively and design a combined approach based on budget and phase.

Conclusion: Email and LINE are not "either/or" but "role-sharing"

Email and LINE are not competing channels but rather complementary ones with distinct strengths. A common mistake is to think, "LINE is enough because its open rate is higher." While LINE appears superior in terms of open rates alone, when considering delivery costs, automation flexibility, expressiveness, and depth of analytics, there are clearly roles that only email can fulfill.

The three decision criteria for differentiating their use are:

• Immediacy and reach: For information that needs to be conveyed "right now," such as sale launches or restocks, LINE is superior. It's not uncommon to get a response within minutes via push notifications.
• Cost structure: LINE Official Accounts operate on a pay-per-use model based on the number of messages sent, so delivery costs increase as the list grows. Email has lower delivery costs, and the increase in expenses is gentler even with a larger list.
• Automation and expressiveness: Scenario automation triggered by actions, such as abandoned carts and welcome messages, and visual expressions that convey a brand's worldview, can be designed more intricately with email.

Distributing deliveries across these three axes is the basic principle of the combined design explained in this article.

Email vs. LINE Comparison Table

First, let's organize the overall picture in a comparison table. The figures are estimates based on trends observed in small and medium-sized Japanese e-commerce businesses supported by Yulie, and they may vary depending on the industry and list quality.

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