Klaviyo SMS Shopify: How to Set Up + 2026 Glossary
TL;DR
Klaviyo SMS is a text messaging channel built into Klaviyo’s marketing platform that syncs with Shopify in real time, letting you send promotional and transactional messages from the same dashboard you use for email. The credit-based pricing is deceptively complex (emojis can double your costs), SMS consent rules differ based on your Shopify plan tier, and automated flows generate 28x more revenue per recipient than broadcast campaigns. This glossary defines every term you’ll encounter when setting up or scaling Klaviyo SMS on Shopify.
What This Glossary Covers and Who It’s For
If you run a Shopify store and you’re evaluating Klaviyo SMS, or you’ve already enabled it and the terminology is making your head spin, this page is for you.
Klaviyo is Shopify’s preferred email marketing partner. Shopify invested $100 million in the company back in 2022, and over 117,000 brands now use the two platforms together. SMS isn’t a bolt-on or a separate app. It’s a built-in channel inside Klaviyo, sharing the same customer data, segmentation engine, and automation builder that powers your email program.
That tight integration is exactly what makes Klaviyo SMS on Shopify powerful. It’s also what makes the terminology confusing. Credits, consent tiers, Unicode encoding, country multipliers, sending number types: there’s a lot to track. This glossary organizes all of it.
For a broader overview of the platform beyond SMS, see our complete Klaviyo guide.
Core Terms: Platform and Integration
Klaviyo
A marketing automation platform built for ecommerce. Klaviyo handles email, SMS, push notifications, and customer data from a single dashboard. It’s positioned as a B2C CRM, meaning it stores and acts on every piece of customer behavior data your store generates.
Klaviyo SMS
The text messaging service inside Klaviyo. It lets you create standalone SMS campaigns (one-time broadcasts) and multichannel flows that combine SMS with email in the same automation sequence. Unlike standalone SMS tools, Klaviyo SMS shares customer profiles, segments, and analytics with your email program, so you’re not managing two separate systems.
Shopify-Klaviyo Integration
Once you connect Klaviyo to your Shopify store, data flows in real time. Purchase history, browsing behavior, cart activity, product views, and customer properties sync automatically, with no manual exports or third-party connectors needed.
Klaviyo tracks five standard Shopify events out of the box: Viewed Product, Added to Cart, Started Checkout, Placed Order, and Fulfilled Order. These events become the triggers for your SMS (and email) automations.
If you haven’t connected the two yet, our Shopify Klaviyo app setup guide walks through the process step by step.
Klaviyo CDP (Customer Data Platform)
As of 2026, Klaviyo’s CDP merges data from your Shopify store, ad platforms, review tools, and support systems into a single customer profile. This matters for SMS because it means your text messages can be triggered and personalized based on data from far beyond just Shopify. You can learn more in our guide to Klaviyo CDP.
Active Profile
The billing unit in Klaviyo. Every contactable profile in your account counts toward your bill, whether you message them or not. If someone has an email address or a phone number in your system and hasn’t been suppressed, they’re an active profile.
Shopify Events
The specific customer actions Klaviyo automatically tracks from your Shopify store:
Viewed Product: A customer looked at a product page
Added to Cart: A customer put an item in their cart
Started Checkout: A customer began the checkout process
Placed Order: A purchase was completed
Fulfilled Order: The order shipped
Each of these events can trigger an SMS flow. The most commonly used triggers for SMS are Started Checkout (for abandoned cart recovery) and Placed Order (for post-purchase updates).
SMS Pricing and Credit Terms
This is the single most confusing part of Klaviyo SMS on Shopify, and the area where the most money gets wasted.
SMS Credit
The currency Klaviyo uses to bill SMS sends. One credit equals one standard SMS message sent to a US phone number. Credits are purchased as part of your monthly plan, on top of whatever you pay for email.
US message rates are tiered by volume: the first 100 messages are free, then $0.012 per message up to 1,200, $0.010 up to 2,500, and $0.009 beyond 2,600.
Here’s the critical detail: unused SMS credits expire monthly with no rollover. If you buy 2,500 credits and only use 800, those remaining 1,700 are gone.
Credit Weight / Country Multiplier
Each destination country consumes a different number of credits per message because mobile carriers charge different termination fees. The multipliers add up fast:
Country | Multiplier | Cost per Message (approx.) |
|---|---|---|
United States | 1x | $0.009–$0.012 |
Canada | 3x | $0.036 |
Australia | 4x | $0.048 |
United Kingdom | 5x | $0.060 |
If you’re selling internationally, these multipliers can dramatically change your SMS budget math.
The Unicode Encoding / Emoji Trap
A standard SMS message allows 160 characters per segment. Add a single emoji or special character and the message switches to Unicode encoding, which caps each segment at 70 characters. That means a 140-character message with one smiley face suddenly becomes two segments instead of one, doubling your credit cost.
This isn’t a theoretical concern. An agency managing 11+ Klaviyo accounts shared a case study where a client burned through her entire monthly SMS budget on a single campaign because the message included emojis. Instead of three campaigns that month, she got one.
The rule is simple: every emoji in an SMS can double or triple your credit burn. Strip them out unless the ROI justifies the cost.
MMS (Multimedia Message Service)
An MMS message includes an image, GIF, or video. In the US, each MMS costs 3 credits (versus 1 credit for a plain text SMS). MMS messages tend to have higher engagement, but the cost difference means you should be deliberate about when to use them.
Email + SMS Plan
Klaviyo bundles email and SMS into a single subscription, but SMS credits are additive. A mid-size DTC brand ($1M–$5M in revenue) might pay roughly $575/month total for 35,000 active profiles, 350,000 email sends, and 2,500 SMS credits. A larger brand with 155,000 active profiles and 87,500 SMS credits could see a bill around $2,745/month, with SMS representing about 29% of the total cost.
Want to make sure your email program is pulling its weight alongside SMS? Our guide on boosting email sales with Klaviyo covers the revenue side.
SMS Consent and Compliance Terms
Getting consent wrong doesn’t just hurt deliverability. It opens the door to lawsuits. The US has strict rules about text message marketing, and Klaviyo’s consent system is more nuanced than most store owners realize.
TCPA (Telephone Consumer Protection Act)
The federal law governing commercial text messages in the United States. Under TCPA, you must obtain express written consent before sending any marketing text. Violations can result in fines of $500–$1,500 per message.
CTIA (Cellular Telecommunications Industry Association)
The industry body that sets additional guidelines for commercial SMS, including requirements around message frequency disclosure, opt-out instructions, and program descriptions in signup forms. Klaviyo’s default forms include CTIA-compliant language.
Express Written Consent
What the law requires before you send a single promotional text. The subscriber must actively agree to receive SMS messages, and your signup form must clearly disclose what they’re signing up for. A pre-checked box doesn’t count.
Double Opt-In
An optional (but recommended) extra step where subscribers confirm their phone number by replying to a verification text. Klaviyo strongly recommends double opt-in for abandoned cart SMS specifically. In the US, you can only send one abandoned cart reminder text per recipient, and it must go out within 48 hours of the cart being abandoned. Double opt-in helps ensure you’re messaging real, consenting numbers.
Quiet Hours
The time window during which SMS messages cannot be sent, typically 8am to 9pm in the recipient’s local time zone. Klaviyo can enforce quiet hours automatically. If a message is scheduled to send at 10pm, it will be held and delivered the next morning. For more on managing deliverability in Klaviyo, including compliance settings, see our dedicated guide.
The Three Consent Types: Promotional, Transactional, and Order Updates
This is Klaviyo’s consent hierarchy, and it’s the single most misunderstood element of Klaviyo SMS on Shopify.
Promotional Consent is the broadest. It allows you to send any type of SMS message: campaigns, promotional flows, and transactional messages.
Transactional Consent is the middle tier. It covers order updates, shipping notifications, and other non-promotional messages. You cannot send marketing campaigns with transactional consent alone.
Order Update Consent (Shopify only) is the most limited. It’s tied to a specific purchase and only permits sending SMS from post-purchase flows about that one order. It expires once the order cycle is complete.
Most stores conflate these three. They’re not interchangeable.
SMS Consent at Shopify Checkout
Your popup captures new visitors, but your Shopify checkout captures buyers. Practitioners consistently report that checkout is where most SMS list growth actually happens.
Here’s the catch: your Shopify plan determines where you can collect consent.
Shopify Plus customers can collect transactional SMS consent directly on the checkout page
Non-Plus customers can only collect transactional consent on the thank you page and order status page
This distinction trips up a lot of merchants. If you’re on a standard Shopify plan and wondering why your SMS list isn’t growing, the checkout limitation might be the reason.
SMS Flows and Automation Terms
Flows are where Klaviyo SMS on Shopify earns its keep. According to Klaviyo’s 2026 benchmark data, flows generate $1.58 per recipient on average versus $0.06 for campaigns. That’s a 28x gap.
Flow
A trigger-based automation that sends messages automatically when a customer takes (or doesn’t take) a specific action. Flows run continuously in the background, unlike campaigns which are one-time sends. An SMS flow might fire when someone abandons a cart, places an order, or hasn’t purchased in 60 days.
Abandoned Cart SMS Flow
The most popular SMS flow and the most regulated. In the US, compliance rules limit you to one reminder text per recipient, and it must be sent within 48 hours of the cart being abandoned.
Because of these restrictions, abandoned cart SMS works best as part of a multichannel sequence where email handles the follow-up cadence and SMS delivers the high-urgency first touch. For detailed setup instructions, see our abandoned cart flow strategy.
Welcome Series SMS
A text message welcome series should accomplish two things: deliver the signup incentive you promised (a discount code, typically) and prompt the recipient to save your number as a contact. That second point matters because saved contacts are far less likely to be filtered as spam by carrier algorithms.
Post-Purchase / Order Update SMS
Transactional messages sent after a purchase: order confirmations, shipping updates, delivery notifications. This feature is Shopify-specific within Klaviyo, meaning it uses the Shopify-Klaviyo integration to pull order data directly. It requires at minimum Order Update consent.
Win-Back SMS Flow
Targets customers who haven’t purchased in a defined period (commonly 60, 90, or 120 days). SMS win-back messages tend to have higher re-engagement rates than email alone because they’re harder to ignore. For more on building effective retention flows, see our guide on email flows for repeat customers.
Browse Abandonment SMS
Triggers when a customer views a product but doesn’t add it to their cart. This flow requires promotional consent and is best reserved for high-intent segments (repeat visitors, previous purchasers) to avoid burning credits on casual browsers.
Conditional Split
A flow component that sends customers down different paths based on their properties or behavior. For example, you might split first-time buyers from repeat customers and send each group a different SMS message. Conditional splits are what make SMS flows feel personal rather than generic.
SMS Performance and Measurement Terms
Revenue Per Recipient (RPR) / Revenue Per Send (RPS)
The metric that actually matters for SMS, not open rate (which is irrelevant for text messages) and not click rate alone. Ecommerce SMS programs average $0.71 RPS in 2026, with the top quartile reaching $1.46 and DTC subscription brands averaging $0.92.
That said, RPS is plateauing. In 2019, SMS subscribers were a small, self-selected, high-intent group. By 2026, mature DTC brands have SMS lists that exceed 40% of their email list size. The marginal subscriber acquired today is materially less responsive than the early adopters.
SMS Click Rate
The percentage of recipients who tap a link in your text message. Benchmark range: 8–15%, compared to 2–4% for email. SMS click rates are dramatically higher, which is why the channel converts well despite its higher per-message cost.
SMS ROAS (Return on Ad Spend)
Median SMS ROAS sits around $25. Abandoned cart flows can hit $80+. Batch-and-blast campaigns typically land between $5 and $15. The gap between flows and campaigns is enormous, which is why your SMS strategy should be flow-first.
Opt-Out Rate
The percentage of recipients who unsubscribe after receiving a message. Median is 0.42% per send. The number one driver of opt-outs is message frequency. More than 4–6 SMS messages per month tends to push opt-out rates above the median.
Flow Revenue vs. Campaign Revenue Split
This is the stat that should reshape your SMS strategy: SMS flows represent just 7.6% of total sends but drive 45.2% of SMS revenue. If your SMS program consists mostly of broadcast campaigns rather than automated flows, your ROI will underperform the benchmarks because you’re using the channel in its weakest configuration.
If you want to segment your ecommerce audience more effectively to improve both flow and campaign performance, segmentation is the foundation.
Sending Infrastructure Terms
Toll-Free Number
The default sending number type for US and Canadian SMS. Klaviyo automatically creates a toll-free number when you enable SMS. No extra cost. Toll-free numbers support both SMS and MMS.
Short Code
A 5–6 digit number used for high-volume sending. Short codes have higher throughput (messages per second) than toll-free numbers and are less likely to be carrier-filtered. They’re a paid add-on, typically reserved for brands sending tens of thousands of messages per campaign.
Branded Sender ID
The default in the UK, Germany, and Australia. Instead of a phone number, recipients see your brand name as the sender. Free to use, but recipients can’t reply to a branded sender ID, which limits two-way conversation.
10DLC / A2P Registration
10DLC stands for “10-Digit Long Code,” and A2P means “Application-to-Person.” US carriers now require businesses to register their brand and campaigns through the A2P 10DLC system before sending commercial text messages. Klaviyo handles much of this registration process, but brands need to provide accurate business information. Incomplete registration can result in messages being filtered or blocked entirely.
Supported Countries
Klaviyo SMS supports only 22 countries as of mid-2026, including the US, Canada, UK, Ireland, Australia, New Zealand, and select European countries.
Notably absent: India. If you’re running a D2C brand selling to Indian customers, Klaviyo SMS won’t work for that market. WhatsApp automation (through tools like WATI) becomes the necessary parallel channel. Our guide on WhatsApp commerce covers how this works with Shopify.
Klaviyo SMS vs. Alternatives: Quick Reference
Factor | Klaviyo SMS | Postscript | Attentive |
|---|---|---|---|
Best for | Brands already on Klaviyo for email | Shopify-native SMS-first brands | Enterprise SMS-first programs |
Monthly cost at 100K subscribers | $3K–$7K | $5K–$10K | $8K–$15K |
Unified email + SMS | Yes (native) | No (SMS only) | No (SMS only) |
Two-way conversations | Limited | Yes | Yes |
Predictive analytics | Yes (built into CDP) | Limited | Limited |
The practitioner consensus is clear: if you’re already using Klaviyo for email and you’re at the $1M–$5M revenue stage, adding Klaviyo SMS is the simplest path. You avoid managing a second vendor, and the unified customer profiles mean your email and SMS programs share data automatically.
Attentive tends to outperform Klaviyo’s SMS product at scale, but it comes with its own platform costs. Postscript sits in between, with strong Shopify-native features but no email capabilities. For a broader platform comparison, see our Omnisend vs. Klaviyo guide.
Common Mistakes (and How to Avoid Them)
The “Set and Forget” Trap
An agency managing 50+ Klaviyo accounts reported the most common mistake they see: a brand enables Klaviyo SMS, adds it to their abandoned cart flow, and then never touches it again. No campaigns, no other flow integrations, no strategy. If you’re paying for SMS credits, you should be sending at least 1–2 SMS campaigns per month and have SMS integrated into all your major flows, not just abandoned cart but welcome, shipping, win-back, and promotional.
Ignoring the Emoji Tax
As covered above, a single emoji can switch your message to Unicode encoding and double or triple your credit cost. Always preview your message length and segment count before sending.
Treating All Consent Types as Equal
Sending a promotional campaign to contacts who only gave order update consent is a compliance violation. Audit your SMS list to make sure each subscriber’s consent level matches the messages you’re sending them.
Skipping Double Opt-In for Abandoned Cart
In the US, the one-message, 48-hour abandoned cart rule means every send has to count. Double opt-in ensures you’re messaging verified numbers, which protects both deliverability and legal compliance.
Over-Sending
Opt-out rates spike when brands send more than 4–6 SMS messages per month. Unlike email, where frequency tolerance is higher, SMS feels invasive when overdone. Quality and timing beat volume every time.
If your Klaviyo SMS Shopify setup needs a professional audit or you want help building flows that actually generate revenue, 360Growth Marketers specializes in Klaviyo for Shopify brands.
Frequently Asked Questions
Does Klaviyo SMS work with all Shopify plans?
Yes, Klaviyo SMS works with all Shopify plans. However, where you can collect SMS consent differs. Shopify Plus merchants can collect transactional consent directly on the checkout page, while non-Plus merchants are limited to the thank you page and order status page.
How much does Klaviyo SMS cost for a typical Shopify store?
It depends on your list size and sending volume. A mid-size DTC brand might pay around $575/month total for email and 2,500 SMS credits. Larger brands with 87,500 credits can expect SMS to represent roughly 29% of a $2,745/month bill. US messages start at $0.009–$0.012 each, but international rates multiply quickly.
Do unused Klaviyo SMS credits roll over?
No. Unused SMS credits expire at the end of each billing cycle with no rollover. Plan your monthly sending volume carefully to avoid waste.
Can I use Klaviyo SMS to message customers in India?
No. Klaviyo SMS supports only 22 countries as of mid-2026, and India is not among them. For Indian D2C brands, WhatsApp automation through platforms like WATI is the recommended alternative.
What’s the difference between an SMS flow and an SMS campaign in Klaviyo?
A flow is an automated sequence triggered by customer behavior (like abandoning a cart or placing an order). A campaign is a one-time broadcast sent manually to a segment. Flows generate about 28x more revenue per recipient than campaigns according to Klaviyo’s 2026 benchmarks.
How many SMS messages should I send per month?
Practitioners recommend at least 1–2 SMS campaigns per month alongside your automated flows. Going above 4–6 total messages per month tends to increase opt-out rates. Focus on high-value, well-timed sends rather than volume.
Can emojis really double my SMS costs?
Yes. Adding an emoji switches the message from standard GSM encoding (160 characters per segment) to Unicode (70 characters per segment). A message that would have been one segment can become two or three, multiplying your credit cost proportionally.
Is Klaviyo SMS better than Attentive or Postscript?
For brands already using Klaviyo for email, adding SMS within the same platform is the most efficient choice. Attentive is stronger for SMS-first, enterprise-scale programs. Postscript is a solid Shopify-native option for brands that want dedicated SMS without email bundled in. At the $1M–$5M revenue stage, Klaviyo’s combined plan typically covers SMS needs without adding another vendor.
