Best SMS Marketing Agencies for Shopify in 2026

A Shopify store launching its first SMS program needs a different partner from a subscription brand trying to reduce churn. The same is true of a team moving off Attentive or a store that already uses Postscript and wants more customers to buy a second time.

This shortlist matches each agency to the job you need done. UM is our best overall pick for Shopify brands that want one team to run SMS, email, and retention together. We’re UM, so that’s our editorial recommendation. The specialist picks are based on publicly documented services and client work.

Best SMS marketing agencies by use case

UM — Best overall for Shopify SMS and email retention

Best for: Shopify brands with an existing customer base that want a team to own the retention calendar, flows, subscriber growth, and reporting.

Our Shopify SMS marketing service covers strategy, copy, campaigns, automations, segmentation, and signup forms. We plan texts alongside email marketing in Klaviyo. That gives us a shared calendar for decisions like whether a launch needs a text, which subscribers should receive it, and when to leave space for an automated message.

Ask us: Which texts would you launch first, and which would you hold until we have a larger opted-in list?

BS&Co — Best for Postscript and second purchases

Best for: Shopify brands using Postscript that want to turn more first-time buyers into repeat customers.

BS&Co focuses its retention work on the second order. Its Postscript partner profile lists managed SMS campaigns, flows, signup growth, and testing. Its snack brand case study shows Postscript handling SMS and signup forms alongside Klaviyo for email.

Ask them: What’s the baseline second-purchase rate, and how will you tell whether the new flow changes it?

Sticky Digital — Best for subscription retention and loyalty

Best for: Shopify subscription businesses that need SMS, loyalty, and subscriber journeys to work together.

Sticky Digital’s retention services cover SMS campaigns and automations, rewards programs, and subscription work on platforms including Recharge, Stay.ai, and Ordergroove. Its subscription scope includes cancellation interventions and winback sequences. It’s a fit when the brief goes beyond the promotional calendar and includes what happens before and after a subscriber cancels.

Ask them: How would you separate active subscribers, customers who’ve canceled, and one-time buyers when deciding who receives an offer?

YOCTO — Best for complex migrations into Klaviyo SMS

Best for: DTC teams consolidating email and SMS into Klaviyo while rebuilding overlapping automations.

YOCTO builds and manages SMS programs for ecommerce and subscription brands. In a case study published by Klaviyo, the agency moved a health-tech client’s SMS program from Attentive to Klaviyo and rebuilt segments and exclusions across channels. That example is relevant if your main problem is duplicated journeys rather than a shortage of texts.

Ask them: What must be checked before cutover, and how will you verify that subscriber permissions, exclusions, and flow triggers work afterward?

Fuel Made — Best for SMS and storefront optimization

Best for: Established Shopify stores that want Klaviyo SMS and help improving the on-site journey from signup to checkout.

Fuel Made combines Klaviyo lifecycle work with Shopify design, development, and conversion rate optimization. Its Klaviyo service describes email and SMS automation content, list growth, and segmentation. That combination is useful if the SMS brief includes a signup form that interrupts mobile shoppers or a landing page that fails to carry through the offer in the text.

Ask them: Which storefront tests would be included in the SMS engagement, and which would require a separate scope?

Magnet Monster — Best for fractional email and SMS strategy

Best for: Ecommerce teams that can build and send campaigns in-house but want outside help with strategy, segmentation, and measurement.

Magnet Monster’s fractional email and SMS offering is built around a dedicated strategist, segmentation guidance, and regular roadmap reviews. It gives your internal team a way to get help deciding what to test while keeping design and production with the people who already do the work.

Ask them: What will the strategist deliver each month, and who will turn the recommendations into live changes?

How to choose an SMS marketing agency

Give each shortlisted agency the same brief: your platform, the size of your opted-in audience, your main retention problem, and who owns production internally. Then ask them to walk through one real workflow, from the signup form to the text and the page it links to.

• Platform and scope: Will they manage campaigns, flows, forms, and reporting in your current stack? If they recommend switching platforms, ask what would improve and what the move would cost.
• Audience and send rules: Ask how they verify who can receive texts, handle opt-outs and sending hours, and prevent a campaign from colliding with a flow.
• Measurement: Ask to see how they report attributed revenue, messaging cost, and unsubscribes. If the goal is to prove added sales, ask how they would test against a comparable group that doesn’t receive the text.
• Ownership: Confirm who approves offers, controls the platform account, and keeps the flows, creative, and reports when the engagement ends.

If your team is still deciding who should receive what, our guide to Klaviyo segments for Shopify gives you concrete examples to discuss. If email is the main gap, see our separate Shopify email agency guide.