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Best AI tools for e-commerce retention agencies (2026)

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26 October 2026 · Agency Brief

Most lists of the best AI tools for ecommerce agencies pile up thirty logos and a "game-changer" for each. If you run email and SMS retention for Shopify brands, you don't need thirty tools. You need to know which agents now do part of the work you bill for, what they cost, and how to test them on one client without putting the retainer at risk.

An owner of a small retention agency usually has three questions:

1. Can Klaviyo's new agent do the audits and monthly reviews I charge for? And if the client can run it too, what am I selling?
2. Which new tools are worth a test now, and which should I just watch?
3. Who is pitching my clients directly, and how do I explain the difference?

This post covers the three tools we've given a public verdict that matter to retention work: Klaviyo Composer, Marklo and Miracly. Every price comes from the vendor's own pricing page or website, checked on October 19, 2026, except where a line says it was checked on October 23, 2026. Prices are USD and exclude tax. Where a page didn't show something, we say so. Every verdict below links to the public page where we published it, and to its page in our AI tools directory.

Klaviyo Composer: TRY (if you run email/SMS for e-com clients)

Our verdict: TRY (if you run email/SMS for e-com clients), from Issue #2, which is also our free sample issue. Tool page: agencybrief.co/tools/klaviyo.

Price: Klaviyo's free plan includes $5 of Composer usage a month, alongside 250 profiles and 500 email sends. Klaviyo's FAQ says Composer is $20/month and includes everything in the free plan "with 4X more usage and the full set of Composer capabilities." Additional usage is bought in $10 increments. Once you hit the included usage, Klaviyo's "Flex" setting bills extra usage at $10 per 1,000 credits, unless you set the upgrade preference to None, in which case Composer pauses until the next billing period (Klaviyo pricing, checked October 19, 2026). Flag: from our location, Klaviyo served its UK English pricing page; the pricing-page figures above are the USD figures shown there. What an audit costs: Klaviyo's help center now publishes estimated costs per action, including $0.10–$4.50 per audit of a flow, form, or template. Klaviyo calls these "estimates only" and says actual usage "may vary, including above the upper limits shown" (Klaviyo Help Center: How your Composer plan works, checked October 23, 2026).

What matters for agencies: on October 13, 2026, Klaviyo made Composer available to every Klaviyo customer. Most retention agencies already work inside Klaviyo, so you can test it without buying another tool. Three features line up with billable work:

• Audits. One of Klaviyo's own example prompts audits live flows for expired coupons, broken links, out-of-stock products, draft messages inside live flows, and any email whose revenue per recipient is 25% below its 90-day average, then returns a ranked fix list (Klaviyo).
• Recurring checks. Scheduled tasks run in the cloud whether or not you're logged in. Klaviyo's example: "Every Monday, review our top flows and flag anything that's slipping" (Klaviyo).
• Skills. You teach Composer a process once, such as your weekly performance review, and it applies that process consistently (Klaviyo). For a small team, that's a way to keep quality the same across a client book.

Klaviyo also says answers come with visible citations, and that results can be compared against benchmarks collected across more than 205,000 customers. That's Klaviyo's figure (Klaviyo).

The catch: work that used to fill hours of a retainer can now come from a prompt, and any client on Klaviyo can run that prompt themselves. Usage is metered: Klaviyo says it varies "based on the type and complexity of the work," and its estimate for a single flow audit runs from $0.10 to $4.50, possibly more, with no exact cost shown before an action runs (Klaviyo Help Center). Decide who pays for Composer usage on each client account before you schedule anything, and set the overage preference so a busy month doesn't surprise anyone.

Marklo: WATCH (e-com campaign planning)

Our verdict: WATCH (e-com campaign planning), from our free sample issue (Issue #2). Tool page: agencybrief.co/tools/marklo.

Price: paid price not public. Marklo now offers a free trial: its homepage has "Start free trial" buttons that link to its Shopify App Store listing (Marklo, checked October 23, 2026), and the listing shows Pricing: Free (Shopify App Store: Marklo, checked October 23, 2026). Marklo still has no pricing page (marklo.ai/pricing returned "not found"), and neither page says what happens after the trial. Crunchbase News reported a subscription-plus-usage model is planned (Crunchbase News), but that isn't Marklo's own page, so we don't count it as a price.

What matters for agencies: Marklo connects a Shopify store and its marketing stack, shows past campaigns across sales, email, SMS, ads and social on one calendar, suggests campaigns to run next with revenue estimates from comparable campaigns, and can push draft emails to Klaviyo (Marklo). Promo-calendar planning for Shopify brands is core agency work, so this lands directly on your scope.

The catch: Marklo is built for the brand's team, not for agencies. Its homepage claims "$50K–$100K saved annually by replacing fragmented tools, contractor and agency time" (Marklo). That's Marklo's claim, not a result we've verified, but it tells you who the product is pitched against. It installs from the Shopify App Store, so the trial runs on a client's store and you'll need the client to install it. Nothing about agency or multi-brand access is listed on its homepage or Shopify listing.

Miracly: WATCH (it's pitching against you)

Our verdict: WATCH (it's pitching against you), from Issue #2, also in our free sample issue. Tool page: agencybrief.co/tools/miracly.

Price: For brands, Starter is $95/month billed monthly or $90/month billed annually, Pro is $395 or $375, and Scale is $895 or $850. Each brand plan covers "one business per subscription." On the agency tab, Agency Growth is $1,095/month billed monthly or $1,040 annually for 5 client brands under one login with white-label reports. Agency Enterprise is custom, with reseller billing (Miracly pricing, checked October 19, 2026). Miracly says no card is needed to start and you can cancel any time.

What matters for agencies: Miracly isn't an email tool. It's an AI-visibility (GEO) and content platform. It's in this post because of how it sells. At launch, co-founder Bjorn Bergstrom said brands "kept being pitched by agencies that wanted $10,000 just to run an audit of our SEO and GEO," and described Miracly as going "from audit, to ongoing monitoring and actual execution" as "a one-stop-shop on autopilot" (Miracly). Swap "SEO and GEO" for "flows and segments" and you can see how the same pitch could be made against retention retainers.

The catch: the threat isn't Miracly itself, it's the pattern. Retainers built on routine audits and monitoring are the easiest thing for an agent to undercut. That's why we call it the audit-retainer risk.

The audit-retainer risk: how to choose the best AI tools for ecommerce agencies without undercutting yourself

Put Composer and Miracly's pitch side by side and the picture is clear. Finding problems (expired coupons, broken links, slipping flows) is becoming a prompt the client can run. Deciding what to do about them and actually fixing them is still work.

So the question for each tool isn't only "does it save us time?" It's also "does it make a deliverable we sell look like a free feature?" In practice:

• Re-describe the retainer before the client does it for you. Our line in Issue #2: the agent finds problems, your team decides and fixes.
• Sell the follow-through. Miracly's founder is selling against audits that end in recommendations. Make sure your deliverable includes the fixes and the results, not just a list.
• Use the agent on your side of the table. If Composer runs the Monday check, your team's hours go into the fixes and the next campaign, and the report shows both.

Side by side

Sources: the vendor pages linked in each section. Prices exclude tax and are USD.

How to test: one client, one week

1. Pick one e-com client you audited recently. Before running anything, set Composer's overage preference to None so usage pauses instead of billing.
2. Run Klaviyo's flow-audit prompt and put the output next to your last manual audit. Make three columns: what it caught, what it missed, and what it got wrong.
3. If it holds up, write one Skill for your standard monthly review and schedule a weekly check. Compare the usage it shows with Klaviyo's estimate ($0.10–$4.50 per flow audit), and track how much Composer usage that uses on the Billing tab before you roll it out to other clients.
4. If a client is on Shopify and Klaviyo, ask them to start Marklo's free trial, run its suggestions alongside your holiday promo plan and compare. Don't replace your plan with it yet.
5. Rewrite the retainer description for that client: what the agent checks, what your team decides and fixes, and what gets reported.

Verdict

If you run retention on Klaviyo, try Composer on one client this week. It's included in an account you already work in, and you can start on the included free usage. Watch Marklo until it publishes a paid price and agency terms; it now has a free trial, so a Shopify client can test it. Watch Miracly for what its pitch tells you, not for what it does: any part of your retainer that is "we check and send a list" needs a rewrite before a client hears that pitch from someone else.

What we couldn't verify

• What a real audit costs. Klaviyo publishes estimates ($0.10–$4.50 per flow, form or template audit) but says actual usage can run above them. We haven't run an audit to measure one, and Klaviyo gives no estimate for a scheduled check.
• Klaviyo's paid email and SMS plan prices. These depend on profile count and are shown through a calculator. We didn't confirm the figures, so we've left them out.
• Agency terms for Composer. Whether Skills can be shared across separate client accounts, and whether agency or partner accounts get anything different, isn't stated on the pricing page.
• Marklo's paid price and what happens after the free trial. There's no public pricing page, and the Shopify listing says only Free.
• Vendor claims: Marklo's "$50K–$100K saved annually," and Klaviyo's 205,000-customer benchmark figure. We report them as claims.

We'll update this page when the vendors publish clearer terms.

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