Best SMS marketing agencies for DTC brands, and how to vet one before you sign

The best SMS marketing agencies for DTC brands build triggered flows before campaigns, collect consent properly, share suppression with email and report revenue per message, not just clicks. Below are six, each described from its own SMS or retention page, then the questions that separate them. Start with the platform you already run: Attentive, Postscript or Klaviyo SMS.

Why DTC brands hire an SMS agency

SMS is the most expensive owned channel per message and the fastest. Emarsys's March 2026 omnichannel benchmarks put SMS open rates between 90% and 98% and click-through between 10% and 30%. Klaviyo's abandoned cart benchmarks, published 2 October 2026 from more than 110,000 accounts, give the text step a 10.3% average click rate and $4.48 in revenue per recipient, rising to 18.5% and $8.69 for the top 10% of brands.

The gap between those two groups is what an agency is paid to close, and most of it comes from structure rather than copy. Omnisend's January 2026 report found automated SMS earns $0.74 per send against $0.15 for SMS campaigns. A brand that blasts campaigns to its whole list pays carrier fees on every message and trains subscribers to opt out. A brand that runs triggered flows sends fewer texts, to people who just did something, and earns several times more per message.

What separates a good SMS agency from an expensive one

• Flows first, campaigns second. Welcome, abandoned checkout, browse abandonment, back in stock, shipping and win-back texts should be live before the campaign calendar is.

• Consent done properly. Express written consent, clear disclosure of frequency and rates, and a working STOP and HELP from the first message. An agency that is vague about consent is a legal risk, not a vendor.

• One program with email. Shared suppression, quiet hours and frequency rules so a customer is never chased on both channels for the same reason. Our email versus SMS guide covers which message belongs where.

• Revenue per message as the core metric. Clicks are cheap; carrier fees are not. A good agency reports revenue per message sent and opt-out rate per send, by flow and by campaign.

• Platform fluency. Attentive, Postscript and Klaviyo SMS handle segmentation, two-way messaging and pricing differently; the agency should know the one you run.

Six SMS marketing agencies for DTC brands

1. BMO Media

BMO Media runs SMS for DTC brands on Attentive, Postscript and Klaviyo SMS, inside a lifecycle program with email, loyalty and reviews. When Darc Sport came to us off Mailchimp with no SMS program, we launched on Attentive and grew the list to 41,000 subscribers within two months, nearly doubling it, with a 29.8% increase in SMS revenue in the same window. The program earns $7.89 in SMS revenue per campaign message sent, and its automation sequences produced an 80% increase in revenue.

For James Michelle, a jewelry brand, segmentation became the lever: SMS campaign volume fell 3% year over year while campaign-attributed revenue rose 111%, and SMS flow revenue grew 235%. Fewer texts, more revenue, which is the point of the channel. Our SMS marketing agency page covers the full program.

2. Stimulate

Stimulate describes itself as a customer retention marketing agency for DTC brands specializing in email and SMS, with a dedicated SMS marketing service page and published case studies on email and SMS revenue growth.

3. Chronos

Chronos offers SMS marketing services alongside email and push, and describes itself as a Klaviyo Master Elite agency running retention for more than 500 DTC brands. Its SMS page names Postscript among the platforms it works in.

4. Flowium

Flowium describes itself as a retention marketing agency that builds email-first lifecycle systems for ecommerce brands, and runs a dedicated SMS service for ecommerce. The fit is brands whose email program is already strong and who want SMS added by the same team.

5. Sticky Digital

Sticky Digital describes itself as Shopify's premier retention marketing agency, specializing in full-service email and SMS strategies. The fit is Shopify brands that want an email and SMS retention specialist.

6. Darkroom

Darkroom's retention service covers email, SMS and lifecycle programs, inside a full-service growth marketing agency for consumer brands. The fit is brands that want paid acquisition and retention from one partner.

What to text, and what to leave to email

A good SMS agency spends as much effort deciding what not to text as what to text. Texts belong to moments with a deadline or a trigger: an abandoned checkout, a restock, a shipping update, early access that opens at a set time, a points balance about to expire. Stories, product education, long offers and newsletters belong in email, where the customer can read at their own pace and the brand does not pay per message. When the two channels share one calendar, the customer gets the story by email and the nudge by text, and never the same message twice. Ask every agency on your shortlist to show you a month of a current client's calendar with both channels on it; the gaps and the overlaps will tell you more than the pitch.

Pick the platform before the agency

If you already run Attentive, Postscript or Klaviyo SMS, shortlist agencies that work in it daily rather than ones that will migrate you on day one. A migration resets consent records, flow history and segment data, and should be a decision with its own business case. Our Attentive versus Postscript comparison covers the trade-offs between the two most common DTC platforms, and our Attentive pricing breakdown covers what the platform side costs. If your email already runs on Klaviyo, Klaviyo SMS keeps both channels in one account; our Klaviyo partner agency page explains how we run them together.

Eight questions to ask an SMS agency

• Which flows will be live in the first 30 days, and in what order?

• How do you collect and record consent, and how do you handle quiet hours by time zone?

• How do you share suppression and frequency rules with our email program?

• What revenue per message and opt-out rate do your current clients see on campaigns versus flows?

• Who writes the copy, and how many texts a month do you plan to send to our full list?

• Which SMS platform do you recommend for us, and what would it cost to stay on our current one?

• Who owns the SMS account and the subscriber list? It should be you, with the agency as a user.

• Which DTC brands are you running SMS for now, and what changed for them in the first quarter?

Red flags

• A campaign calendar with no flows in the first month.

• Reporting that leads with clicks and open rates and never mentions revenue per message or opt-outs.

• A plan to text the whole list several times a week from day one.

• Vague answers on consent, or a suggestion to import numbers that never opted in.

• An insistence on migrating platforms before the current program has been audited.

What the first 90 days of an SMS program look like

Month one is consent and the core flows. The agency should audit how numbers are collected and recorded, fix the opt-in so it states the program, frequency and rates, set quiet hours by time zone, and launch the welcome, abandoned checkout and shipping texts. Month two adds browse abandonment, back in stock and the first segmented campaigns, sent to engaged subscribers rather than the whole list. Month three adds win-back, replenishment for consumables and two-way replies where the platform supports them, and the first full report: revenue per message by flow and campaign, opt-out rate per send, and list growth net of opt-outs.

If, at the end of the quarter, revenue per message is rising and opt-outs per send are flat or falling, the program is compounding. If revenue is rising only because volume is rising, it is renting the list.

In-house or agency for SMS?

In-house works when one person owns both email and SMS, has the time to write and test texts every week, and can approve offers without a committee. It fails when SMS becomes a second job for the email marketer, because the channel punishes slow reactions: a back in stock text sent a day late earns little, and a campaign sent at the wrong hour costs subscribers. An agency is worth its fee when it brings the flows, the testing rhythm and the compliance discipline on day one, and when it runs SMS with email rather than beside it.

What an SMS agency costs

Three costs stack: the platform subscription, carrier fees per message segment, and the agency retainer. The first two are yours regardless of who runs the program, which is why revenue per message decides whether the channel pays. None of the agencies above publish an SMS rate card on the pages read for this list; most scope a monthly retainer to the flows, campaigns and channels in scope. Our SMS marketing best practices guide covers how to keep the carrier side efficient, and our SMS list growth guide covers compliant capture.

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