SMS vs Email Marketing for Shopify: ROI Comparison and When to Use Each

The SMS versus email debate is one of the most common questions among Shopify store owners scaling their owned-channel marketing. Both are powerful revenue drivers. Both belong in a mature DTC marketing stack. But they have fundamentally different strengths, limitations, cost structures, and use cases. Understanding the differences — and knowing when to deploy each channel — is the key to maximising the return on your marketing investment.

This comparison draws on benchmark data from across the Shopify ecosystem in 2026, covering open rates, click-through rates, conversion rates, revenue per send, cost per message, and ROI by campaign type. By the end of this article, you will have a clear framework for how to allocate your marketing budget and content effort between SMS and email for your specific store.

The Core Metrics: Where Each Channel Stands in 2026

Email marketing benchmarks for Shopify stores in 2026: average open rate 20–40% (varies significantly by list quality, sender reputation, and subject line), click-through rate 2–5%, conversion rate 0.5–2%, revenue per email sent $0.05–$0.25, and average ROI of 36:1 (every £1 or $1 spent on email generates $36 in revenue, per DMA data).

SMS marketing benchmarks for Shopify stores in 2026: average open rate 95–98%, click-through rate 19–45%, conversion rate 2–8%, revenue per SMS sent $0.15–$1.20, and average ROI of 25:1 (though this figure is heavily influenced by platform cost and list size — high-volume stores often see 50:1 or better).

On raw open and click rates, SMS wins by a wide margin. Email’s advantage is in cost per send: a marketing email costs a fraction of a cent to send through platforms like Klaviyo, while an SMS costs $0.01–$0.02 per message. This cost difference matters significantly at scale. A store with 100,000 subscribers pays roughly $1,000 to send a single SMS broadcast but less than $100 to send an email to the same list.

Revenue per Subscriber: The Most Important Comparison Metric

Rather than comparing open rates or even ROI ratios in isolation, the most useful metric for Shopify store owners is revenue per subscriber per year. This accounts for the difference in list size (most stores have far larger email lists than SMS lists), send frequency, and conversion rates, giving you a true apples-to-apples comparison of the economic value each channel delivers.

Industry benchmarks suggest email subscribers generate $8–$35 in revenue per subscriber per year, with the wide range driven by email list engagement, brand category, and programme sophistication. SMS subscribers typically generate $25–$75 per subscriber per year — a figure that reflects both the higher conversion rates per message and the typical send frequency of 2–4 messages per month.

What this means practically: an SMS subscriber is worth two to five times more than an email subscriber, per subscriber. The caveat is that SMS lists are typically much smaller than email lists because they are harder to grow (requiring phone number collection and explicit opt-in consent). A store with 50,000 email subscribers and 5,000 SMS subscribers might generate $400,000 from email and $175,000 from SMS — with email producing higher total revenue despite lower per-subscriber value.

Where Email Wins: Content Depth and Nurture

Email is the superior channel for content that requires depth. Product launch stories, brand narratives, educational content about your products, detailed seasonal lookbooks, and loyalty programme explanations all belong in email. The format supports images, multiple product blocks, navigation menus, and long-form copy in ways that SMS fundamentally cannot replicate.

Email is also better for nurturing cold subscribers who have not yet purchased. A new email subscriber goes through a welcome series, receives regular newsletters, sees multiple product categories, and gradually develops brand affinity over weeks or months before converting. This nurture function — keeping your brand front of mind during a longer consideration window — is something SMS handles poorly. Receiving two to four texts per month from a brand you have not bought from yet feels intrusive; receiving the same number of emails feels normal.

List management costs also favour email for stores with large databases. Maintaining 100,000 email contacts on Klaviyo costs a few hundred dollars per month regardless of send frequency. Maintaining 100,000 SMS subscribers costs $1,000–$2,000 per broadcast message. For stores with large, less-engaged lists, the economics of SMS become difficult to justify without careful segmentation.

Where SMS Wins: Urgency and Immediacy

SMS dominates in any scenario where timing and immediacy matter. Flash sales with 4–8 hour windows. Back-in-stock alerts for high-demand products. Personalised birthday offers. Loyalty point expiry warnings. Order and shipping status updates. These messages need to be seen within minutes, not hours — and email cannot reliably deliver that. The average email is read within 6–8 hours of being sent; the average SMS is read within 3 minutes.

For abandoned cart recovery, SMS consistently outperforms email by 3–5x on conversion rate. The combination of immediacy and the personal nature of the SMS inbox means a cart recovery text sent 30 minutes after abandonment reaches the subscriber while they are likely still in a shopping mindset, dramatically increasing the chance of conversion.

Transactional messages — shipping updates, order confirmations, delivery notifications — also work exceptionally well via SMS. Customers genuinely want these updates and read them immediately. Delivering transactional messages via SMS builds positive brand associations with the channel, which improves open rates and engagement on your marketing SMS messages over time.

The Right Framework: Use Both, Not One or the Other

The question of SMS vs email should not be a binary choice for any Shopify store generating over $200k annually. The highest-performing DTC brands in 2026 use both channels in a coordinated way, playing to each channel’s strengths rather than treating them as substitutes for each other.

A practical allocation framework: use email for weekly newsletters, product storytelling, educational content, detailed promotions, and cold nurture sequences. Use SMS for time-sensitive promotions, abandoned cart recovery, restock alerts, loyalty milestones, and post-purchase VIP engagement. The two channels should complement each other — when you launch a sale, send an email first with the full details, then an SMS a few hours later as a reminder with a direct link for easy access.

Co-ordinated email and SMS campaigns consistently outperform either channel alone. Research from Klaviyo shows that customers who receive both email and SMS communications from a brand have a 20–30% higher lifetime value than those reached through only one channel. The combined presence of both touchpoints creates a reinforcing effect on brand recall and purchase behaviour.

Budget Allocation Guidance

For Shopify stores just starting with owned-channel marketing: build email first. It is cheaper to set up, cheaper to scale, and carries less compliance complexity. Once you have a functioning email programme generating consistent results, layer in SMS — starting with abandoned cart automation before any broadcast campaigns.

For stores with an established email programme: allocate 15–25% of your owned-channel marketing budget to SMS. This typically means one SMS platform subscription plus the cost of your automated flows and 2–4 monthly broadcast campaigns. As you grow your SMS list and prove the channel ROI, increase the allocation proportionally.

For high-volume Shopify stores ($1M+): treat SMS as a first-class channel with its own content calendar, dedicated budget, and regular performance review. At this scale, the revenue difference between an under-invested and well-invested SMS programme can easily be $100,000+ annually.

If you need help building an integrated email and SMS strategy for your Shopify store, our team at Oneonic can help. We have worked with Shopify brands across multiple categories to build owned-channel programmes that consistently outperform industry benchmarks. Explore our services, review our client work, or book a strategy call to discuss your store’s specific opportunities.