SMS gets a 12.39% click-through rate. Email gets 0.74%. That's not a small gap. That's SMS clicking through at nearly 17 times the rate of email, according to Omnisend's 2025 benchmark across 246 million sends.

So SMS wins, right? Not so fast. Look at revenue per message and the story flips hard: automated email generates $3.41 per send. Automated SMS generates $0.74. Email is still the workhorse. SMS is the loud friend who shows up late and leaves early, but makes an entrance when it matters.

The Real Numbers: SMS vs Email Side by Side

Most articles comparing these two channels pick a winner and move on. That's lazy. The honest answer depends entirely on what you're measuring and when in the customer journey you're measuring it.

Read that table twice. SMS crushes email on clicks and edges it out on campaign conversion. Email crushes SMS on automation revenue, nearly 4.6x more per send. Two channels, two completely different jobs.

Why Email Still Wins on Revenue Per Message

Email supports longer content, richer product imagery, and multiple calls to action in a single send. A post-purchase email flow can walk a customer through three different upsell paths in one message. SMS cannot. You get 160 characters and one link, maybe two if you're pushing it.

This is why automated email still dominates revenue per send. Welcome series, browse abandonment, post-purchase sequences, win-back flows. Each one carries more context than a text ever could. A well-built welcome email series nurtures a new subscriber across seven days. Try cramming that into SMS and every message reads like a demand.

Email is a conversation. SMS is an interruption. Both have their place, but only one of them should be doing most of the talking.

Where SMS Actually Beats Email

Speed. That's the entire pitch. 87% of consumers check a text within 15 minutes of receiving it. 32% check immediately. Email doesn't come close to that kind of urgency, and it never will, because inboxes are cluttered and phones are not.

This makes SMS the better channel for anything time-sensitive. Flash sale ending in two hours. Restock alert on a product that sold out in nine minutes last time. A shipping delay notice. According to Postscript's 2026 benchmark across 17,000+ Shopify stores, abandoned cart SMS messages pull a 9.53% to 17.28% click-through rate and a 3.97% to 7.84% conversion rate, both dramatically higher than standard SMS campaigns sitting at 2.87% to 8.01% CTR and 0.12% to 0.54% conversion.

Translation: SMS is not a broadcast channel. It's a trigger channel. Fire it off when something specific just happened. Don't use it to announce your quarterly sale to your whole list.

The Cost Nobody Talks About

Every SMS costs money to send. Every email is nearly free at scale. This changes the math entirely once your list grows past a few thousand subscribers.

Revenue per message for SMS ranges from $0.41 to $2.13 across the full mix, with abandoned cart triggers hitting $3.52 to $10.95 and standalone campaigns landing at a thin $0.11 to $0.55. Compare that to email, where a single automated flow generates $3.41 per send at essentially zero marginal cost. Sending 50,000 promotional texts a month without a strong revenue-per-message ratio is a fast way to burn your margin. Most stores learn this the expensive way.

There's also the compliance layer. SMS requires explicit, separate opt-in under TCPA rules in the US. You cannot piggyback consent from your email list onto SMS. Unsubscribe rates tell the story too: 0.33% to 0.88% for SMS campaigns and 0.56% to 1.83% for abandoned cart texts. People opt out of SMS faster than email because a text feels personal in a way an inbox message doesn't. Annoy someone by text and they leave permanently. Annoy them by email and they might just skip one send.

Segmentation Changes Everything

Here's a mistake almost every new Shopify merchant makes: sending the same message to the whole list on both channels. Big mistake. A blanket SMS blast to 10,000 subscribers who haven't purchased in six months will tank your click rate and spike your opt-out rate in the same week.

Segment by purchase recency, cart status, and product category before you send anything. A customer who abandoned a cart 20 minutes ago is a different audience than someone who bought three months ago and hasn't opened an email since. Treat them the same and you waste the channel's strength. SMS in particular punishes broad targeting harder than email does, because every irrelevant text is a direct hit to your sender reputation with carriers like AT&T and Verizon, not just an annoyed customer.

Email tolerates broader segmentation because the cost of a miss is lower. Someone ignores an irrelevant email. They rarely unsubscribe over one bad send. Do that on SMS three times and you've lost the subscriber for good. Segment SMS tighter than you segment email. That's the rule, and most stores break it in their first month.

Platform Costs and What They Actually Buy You

Email platforms like Klaviyo charge based on contact count, and the marginal cost of an extra send is close to zero once you're on a plan. SMS platforms charge per message sent, on top of the platform fee, and carrier fees stack on top of that. A store sending 20,000 texts a month at roughly $0.01 to $0.03 per segment can rack up a real bill before a single sale closes.

This is exactly why the revenue-per-message metric matters more for SMS than for email. A $3.41 email automation send costs the store almost nothing extra to deliver. A $0.74 SMS automation send has real delivery cost baked in, which shrinks the effective margin further than the raw number suggests. Run the math on your own list before scaling SMS volume. Don't just chase the flashy click-through rate and ignore what it actually nets you after platform and carrier fees.

Building a Channel Strategy That Uses Both

The best-performing Shopify stores don't pick a side. They split responsibilities. Email handles volume, storytelling, and automated flows that build over days or weeks. SMS handles the five or six moments that actually need a phone buzz: cart abandonment in the first hour, a restock alert, a same-day flash sale, an order shipped notification.

Stack them and you get compounding results, not competing ones. A customer who abandons a cart might get an SMS nudge within 20 minutes and a full abandoned cart email sequence over the next three days if the text doesn't convert. That's not redundant. That's coverage. If you want the deeper mechanics of why recovery flows work the way they do, the guide on how to recover abandoned carts on Shopify breaks down both channels together.

One thing that trips up merchants constantly: treating urgency the same way across both channels. Scarcity and urgency tactics that work in an SMS blast, short, blunt, countdown-driven, will feel spammy stretched across a full email. Match the format to the channel. Don't just copy-paste the same message into both.

What to prioritize if you're starting from zero

1. Set up email flows first. Welcome series, abandoned cart, post-purchase. These generate the bulk of your automated email marketing ROI and cost almost nothing to run.

2. Add SMS only for cart abandonment triggers. This is the single highest-converting use case, with conversion rates up to 7.84% in the Postscript data.

3. Build separate, compliant opt-in flows for SMS. Do not assume email consent covers texting. It doesn't, legally or practically.

4. Reserve SMS campaigns for genuine urgency. Restocks, flash sales, shipping issues. Nothing routine.

5. Track revenue per message on both channels monthly. If SMS campaign EPM drops below $0.20 for two months running, cut volume before your unsubscribe rate climbs.

Pick the first one on this list today. Set it up. Measure for two weeks before touching anything else.

Testing Your Own Numbers Instead of Trusting Benchmarks

Industry benchmarks are a starting point. They are not your store's reality. A 12.39% average SMS click-through rate means nothing if your list skews toward customers who never check texts, or if you sell a product category where email research behavior dominates, like home furniture or anything over $500.

Run a four-week test before committing budget to either channel at scale. Send the same abandoned cart trigger through email only for two weeks, then through SMS only for two weeks, to comparable audience segments. Track revenue per recipient, not just click rate, because click rate without a conversion number tells you almost nothing about what's actually landing in your bank account.

Most merchants skip this step and just copy whatever a competitor or an app's marketing page claims works. That's a mistake. Your average order value, your product category, and your customer's age skew all change which channel wins for you specifically. A skincare brand selling $28 restocks behaves nothing like a furniture store selling $1,200 sectionals, and the channel mix that wins for one will flop for the other.