Email vs SMS marketing for Shopify (2026): which to use, and when
For most Shopify stores the honest answer is not email or SMS, it is both: email as the workhorse and SMS for urgency. Email costs a fraction of a cent per send, carries rich, long-form content, and runs your newsletters and automated flows; SMS costs meaningfully more per message but lands in a pocket within minutes, which is exactly what you want for a cart reminder, a product drop, or a restock. The two channels answer different jobs, they sit under different laws (CAN-SPAM for email, the stricter TCPA for SMS), and many of the top apps, including Omnisend and Klaviyo, run both from one place. Below we compare them honestly on cost, engagement, and compliance, from verified sources as of July 2026, and show you when each one earns its place. We did not run a live A/B test between them, and we do not pretend to; this is a synthesis of the public facts.
Email economics → fractions of a cent per send, rich and clickable, roughly $36 back per $1 spent (Litmus). The workhorse.
SMS economics → roughly $0.007 to $0.015 per message in the US (plus carrier fees), very high open and response, but short and time-sensitive. Reserve it for moments that are genuinely urgent.
Compliance decides how, not whether → email falls under CAN-SPAM (FTC); SMS falls under the stricter TCPA (FCC), which requires prior express written consent before you text a customer.
You do not need two apps. Omnisend and Klaviyo, among others, run email and SMS from one platform, which is usually simpler than stitching a dedicated SMS tool onto a separate email tool.
The honest caveat: per-send costs and app pricing below are as of July 2026 and drift; the widely-quoted ~98% SMS open rate is an industry estimate, not a directly measured figure.
First, the idea that ends the argument: two channels, two jobs
Email and SMS are not competitors fighting for the same slot; they are tools for different jobs, and treating them as rivals is how stores either overspend on texts or leave money on the table. Email is your broad, cheap, rich channel: you can send a 600-word newsletter with images, multiple links, and a full automated welcome or post-purchase flow, all for a fraction of a cent per recipient. SMS is your narrow, costly, instant channel: 160-ish characters that land in a pocket and get read within minutes, which is worth the higher cost only when the moment is genuinely time-sensitive. Once you see them as workhorse and sprinter rather than as an either-or, the "which" question mostly answers itself, and the real work becomes assigning each message to the right channel.
Email vs SMS, side by side
Here are the two channels on the dimensions that actually decide how you use them. Read the "best role" and "compliance" rows as carefully as the cost row, because the legal layer is where most stores get into trouble.
| Dimension | SMS | |
|---|---|---|
| Cost per send | Fractions of a cent (well under $0.01 typical, per-contact or per-send plans) | ~$0.007 to $0.015 per message in the US, plus carrier fees |
| Message form | Long-form, images, multiple links, newsletters and multi-step flows | Short (~160 chars), plain, time-sensitive, one clear action |
| Engagement | Lower open rates, but rich and repeatedly referenceable; strong click depth | Very high open and response; commonly cited ~98% open (estimate, not measured); read within minutes |
| Economics | ~$36 back per $1 spent (Litmus); the volume workhorse | Higher cost per send, but strong conversion on genuinely urgent moments |
| Compliance | CAN-SPAM (FTC): honest headers, no deceptive subjects, physical address, honor opt-outs; up to $53,088 per email | TCPA (FCC): prior express written consent required before texting; stricter |
| Best role | Newsletters, welcome and post-purchase flows, promotions, education | Cart recovery, product drops, restock alerts, flash sales |
The pattern is consistent: email wins on cost, richness, and reach, so it carries the bulk of your program; SMS wins on immediacy and gets rationed to the moments that are worth a higher per-message cost and a stricter consent bar.
Where each one wins
The clearest way to plan a program is to sort your messages by channel before you write a word. What belongs in email, and what earns an SMS.
- Newsletters and content. Long-form updates, education, and storytelling that SMS has no room for.
- Automated flows. Welcome series, post-purchase, browse and cart sequences, win-back, all cheap to run at volume.
- Promotions and launches. Full creative with images and multiple links, at a fraction of a cent per recipient.
- Anything not time-critical. If it can wait a few hours and wants depth, it is an email.
- Cart and checkout recovery. A nudge that lands in minutes while intent is still warm.
- Drops and launches with a clock. Limited stock, early access, "live now" moments where speed is the point.
- Restock and back-in-stock alerts. The customer asked to be told the instant it is available.
- Flash sales and short windows. Anything where a delay of hours means a missed sale.
The three numbers that frame the choice
Three figures capture the trade cleanly. Note the middle one is deliberately hedged: it is an industry estimate, not a measured rate.
Email return on spend
Email marketing returns about $36 per $1 spent (Litmus). It is the cheap, high-leverage workhorse.
SMS open rate (estimate)
The ~98% SMS open rate is commonly cited but an industry estimate from delivery and response data, not a directly measured figure.
SMS cost per send
SMS runs roughly $0.007 to $0.015 per message in the US plus carrier fees, orders of magnitude more than an email, so you ration it.
Email is the workhorse you run at volume for fractions of a cent. SMS is the sprinter you save for the moment the clock is running. Run both, in those roles, and each pays for itself.MerchantStack channel analysis, July 2026
The compliance layer most guides skip
Here is the part vendor blogs and affiliate listicles tend to gloss, and it is the part that can actually cost you: email and SMS are governed by different laws, and SMS is the stricter of the two. Getting consent wrong is not a style choice, it is legal exposure, so treat this as a real input to your channel plan, not fine print.
Email falls under CAN-SPAM, enforced by the Federal Trade Commission. In plain terms it requires accurate "from" and header information, no deceptive subject lines, clear identification that the message is an ad, a valid physical postal address, and a working, honored opt-out. It applies to business-to-business email too, not just consumer, and the FTC's own CAN-SPAM Act compliance guide for business is the primary source. Penalties can reach up to $53,088 per email, which is per message, not per campaign, so a sloppy blast is expensive.
SMS falls under the TCPA, the Telephone Consumer Protection Act (47 U.S.C. section 227), enforced by the Federal Communications Commission, and its bar is higher: you need prior express written consent before sending marketing texts, not just an implied opt-in. Recent FCC rulemaking tightened this further; a one-to-one written-consent requirement was set to take effect around January 27, 2025, and rules making it easier for consumers to revoke consent took effect April 11, 2025. The primary sources are the FCC's TCPA rules (PDF) and its order on revoking consent for unwanted robocalls and robotexts. In practice this is why reputable SMS apps push you toward compliant opt-in widgets and keep opt-out ("reply STOP") handling automatic: the written-consent bar is real, and the app is helping you clear it.
The compliance one-liner: collect email opt-ins under CAN-SPAM (honest headers, a physical address, an honored unsubscribe) and collect phone numbers under the stricter TCPA (prior express written consent, easy revocation). Never text a customer just because they gave you an email, and never assume a purchase equals SMS consent. When in doubt, the FTC and FCC resources linked above are the primary sources, not a vendor blog.
Why the real answer is both, from one app
Because the two channels do different jobs, most growing stores end up wanting both, and the good news is you rarely need two separate tools. Several of the top Shopify apps run email and SMS from a single platform, which keeps your segments, flows, and reporting in one place. Omnisend bundles email, SMS, and push on a per-contact plan and is the value default for most small and mid stores; Klaviyo runs both on a deeper data platform and earns its premium once you actually use the analytics. If you want SMS to lead, dedicated tools such as Postscript (Shopify-native, per-message pricing around $0.007) and Attentive (enterprise) specialize there, and even Shopify's own Shopify Email app now includes basic SMS. The decision is less "email app or SMS app" and more "one platform that does both, or a dedicated SMS tool alongside my email tool," and for most stores the combined platform is simpler. We rank the combined options in the best Shopify email marketing apps hub and the SMS-first options in best Shopify SMS marketing app. To confirm current listings and numbers, browse the category on the Shopify App Store.
A note on cost: cheap per send is not the whole story
It is tempting to read the per-send numbers and conclude email is simply "cheaper," but the honest comparison is cost per outcome, not cost per message. Email is cheap per send, yet at scale your bill is driven by list size and pricing model (per-contact plans bill you for every stored profile, per-send plans bill you for volume). SMS is expensive per message, but a well-timed cart or drop text can convert at a rate that justifies the cost on that specific moment. The mistake is spending SMS money on messages that email could have carried, or under-using SMS on the few moments where immediacy genuinely moves the sale. For the full breakdown of what email actually costs as your list grows, including the billing traps the sticker price hides, see how much does Shopify email marketing cost.
Frequently asked questions
Is email or SMS better for Shopify? Neither, outright. Email is better as your everyday workhorse (newsletters, flows, promotions) because it is cheap per send, rich, and long-form; SMS is better for urgent, time-sensitive moments (cart recovery, drops, restocks) because it is read within minutes. Most stores should run both, with email as the default and SMS reserved for urgency.
How much does SMS marketing cost versus email? SMS runs roughly $0.007 to $0.015 per message in the US plus carrier fees, while email costs a fraction of a cent per send. SMS is far more expensive per message, which is exactly why you ration it to high-value, time-sensitive sends rather than routine newsletters. Prices drift, so confirm current per-message rates on your app's pricing page.
Do I really need both email and SMS? Not on day one, but most growing stores end up wanting both. Start with email as the workhorse, since it carries the bulk of your program cheaply, and add SMS once you have moments worth the higher cost and stricter consent bar (abandoned carts, launches, restocks). Apps like Omnisend and Klaviyo run both from one platform, so adding SMS rarely means adding a second tool.
What are the compliance rules for email and SMS? Email falls under CAN-SPAM (FTC): honest headers, no deceptive subject lines, a valid physical address, and an honored opt-out, with penalties up to $53,088 per email. SMS falls under the stricter TCPA (FCC), which requires prior express written consent before you text a customer and makes revocation easy. Never treat an email opt-in or a purchase as SMS consent. The FTC and FCC resources are the primary sources.
Is the 98% SMS open rate real? Treat it as an estimate. The commonly cited ~98% figure comes from delivery and response data, not a directly measured open rate, and different vendors converge somewhere in the 95 to 98% range. SMS genuinely does get read quickly and at high rates; just do not treat that exact number as a hard, measured statistic.
Bottom line
Stop framing this as email versus SMS. Email is the cheap, rich workhorse that should carry your newsletters, flows, and promotions at fractions of a cent per send; SMS is the expensive, instant sprinter you save for cart recovery, drops, restocks, and flash sales, where immediacy is worth the cost. Run both, ideally from one platform like Omnisend or Klaviyo, and let the roles, not a false either-or, decide where each message goes. Above all, collect email under CAN-SPAM and SMS under the stricter TCPA written-consent bar, because the channel with the higher engagement is also the one with the higher legal stakes. Get the roles and the consent right, and the "email or SMS" question dissolves into a plan.