Klaviyo flows, list growth and deliverability
The only channelthat gets cheaper
Every other line in our ecommerce practice costs more each year as auctions get more crowded. Email does the opposite. The list you built last year sends for the same near-zero cost this year, and it is where the second order comes from, which is the order that decides whether paid acquisition works at all.
★★★★★ 4.9 across 312 client reviews
Flows against campaigns
Five percent of your sendsare doing all the work
Most brands treat email as a calendar. Something goes out Tuesday and Thursday, someone argues about the subject line, and the report at the end of the month shows an open rate. Meanwhile the automated flows, which almost nobody looks at, are quietly carrying the revenue.
Klaviyo's 2026 benchmark data across more than 183,000 brands puts the gap in stark terms.
Automated flows
- Share of all sends
- 5.3%
- Share of email revenue
- ~41%
- Click rate
- 5.58%
- Placed-order rate
- 2.11%
- Revenue from first-time buyers
- ~48%
Campaigns
- Share of all sends
- 94.7%
- Share of email revenue
- ~59%
- Click rate
- 1.69%
- Placed-order rate
- 0.16%
- Revenue from first-time buyers
- ~16%
Revenue per recipient on flows runs close to eighteen times campaigns. The placed-order rate is roughly thirteen times higher. And nearly half of flow revenue comes from people buying for the first time, against about a sixth of campaign revenue, which means flows are not only a retention tool. They are finishing the job your ads started.
A campaign is a decision you make every week. A flow is a decision you make once.
That is the whole argument for build order. Flows compound, campaigns do not. Mature programmes run flows at 50 to 60 percent of email revenue, and the working rule is that if campaigns account for more than 70 percent of your email revenue, the flow architecture is underbuilt regardless of how good the campaigns are.
The timing data explains why it matters so much for the rest of the account. Half of all second orders land within 30 days of the first, three quarters within 90, and 77 percent of them are a reorder of the same product rather than a cross-sell. Most brands spend that entire window silent, then wonder why paid acquisition never pays back.
Email is also the cheapest customer you will ever touch again. Published acquisition costs for the channel run in the $8 to $15 range against $130 or more on paid social, and the marginal cost of the next send is effectively nothing.
Free, no email required
Put a price onthe flows you don't run
Tick off what is actually live in your account. This sizes what a benchmark flow programme would be worth at your revenue, splits it across the six flows that matter, and shows what the missing ones are costing you every month in contribution.
Your programme
Last 30 days, from Shopify and your email platform.
Which flows are live and working
Live means built, sending, and reviewed in the last quarter. A welcome flow written two years ago that still offers a discontinued product is not live. Contribution margin comes from the map on the hub, not your gross margin.
What it is worth
Updates as you type. Nothing is sent anywhere.
How this is calculated, so you can argue with it. The size of the prize comes from published bands: email at 27% of revenue on average, flows at 50 to 60% of email revenue in mature programmes. Splitting that total across the six flows is our allocation, not a published benchmark, and the weight is printed on each row so you can adjust it in your head. Nobody publishes a universally agreed per-flow split, and any page that gives you one to two decimal places is making it up.
The six that matter
What each flow does,and what good looks like
Published benchmarks where they exist, stated plainly. Build them in this order, because each one catches people the previous one missed.
| Flow | Fires when | Benchmark | The part people get wrong |
|---|---|---|---|
| Welcome | Someone signs up and has not bought | 8–12% conversion 40–60% open rate |
The first email carries 60 to 90 percent of the whole series' revenue, so the strongest offer belongs there rather than saved for email four. |
| Cart & checkout | Items added or checkout started, no order | 8–12% recovery multi-step |
A single reminder email recovers only 2 to 3 percent. The recovery rate is a function of the number of steps, not the copy in any one of them. |
| Browse abandonment | Product viewed, nothing added | Lower volume, very low cost |
Usually skipped because the conversion rate looks unimpressive next to cart. It runs on far more traffic, so the absolute revenue is often larger. |
| Post-purchase | Immediately after an order ships | Half of second orders land within 30 days |
Treated as a receipt. It is the highest-attention message you will ever send, and it is where the post-purchase survey that fixes your attribution belongs. |
| Winback & replenishment | At the category's natural reorder point | 77% of second orders are the same product |
Brands send "you might also like" when the data says "ready for another?" wins in most categories. Timing beats creative here. |
| Sunset & re-engagement | No engagement for 90 to 180 days | Protects the other five | It looks like deleting revenue. It is buying deliverability, and without it the other five flows land in spam. |
Sources: Klaviyo's 2026 ecommerce benchmark report across 183,000+ brands, agency benchmark compilations for Klaviyo-powered brands, and a February 2026 analysis of 156,110 DTC customers for the second-order timing figures. Conversion ranges are targets for a well-built flow, not averages across all brands.
The two things that break it
A list that stops growing,or stops arriving
Flows are the engine. These two decide whether it has fuel and whether the exhaust is connected. Both are unglamorous, both are measurable, and both are where a programme quietly dies.
List growth
Ecommerce lists typically grow 2 to 5 percent a month, and a mature list holding 1 to 3 percent net of churn is doing fine. The lever is almost always the signup form rather than the traffic.
- Under 1.5%Signup rate of sessions. Something structural is broken: timing, offer or targeting.
- 1.5–3%Average. Capturing, but there is real room. Most stores sit here.
- 3–8%Well optimised. Ecommerce as a category averages around 6.9% on popups.
- 8%+Top tier. Usually multi-step or gamified forms with a genuine offer.
Standard discount popups convert around 3 to 5 percent and gamified spin-to-win forms 8 to 15 percent, though the second-page trigger consistently beats both. Ask for the email first and the phone number later, since collecting both at once suppresses the signup rate and SMS consent has its own rules.
Deliverability
Since February 2024 this stopped being best practice and became an entry requirement. Roughly one in six commercial emails already misses the inbox, and about 30 percent of senders remain partly non-compliant.
- SPF + DKIMMandatory for everyone. Bulk senders also need a DMARC record and a From domain that aligns.
- One-clickRFC 8058 unsubscribe headers, honoured within two days. Not a link in the footer.
- Under 0.1%Spam complaint rate to actually stay safe. This is the target, not the limit.
- 0.3%Where Gmail and Yahoo enforcement begins. Sustained, it triggers bulk filtering that takes weeks of clean sending to undo.
Two traps worth knowing. Yahoo measures complaints against inbox-delivered mail only, so identical behaviour scores worse there than at Gmail. And Microsoft applies its rules from 1,000 messages a day rather than Google's 5,000, with outright rejection since late 2025. Watch Google Postmaster Tools and Yahoo's dashboard separately, and treat open rate as unreliable, since Apple's privacy protection inflates a large share of reported opens.
You've got questions
We've got
straight answers
What share of revenue should email be driving?
Around 27 percent is the platform average across Klaviyo's ecommerce base, and mature programmes run 30 to 40 percent on email and SMS combined. Under 25 percent usually means the flow architecture is thin rather than the campaigns being bad.
The more diagnostic number is the split. If campaigns are producing more than 70 percent of your email revenue, flows are underbuilt, and that is fixable in weeks rather than quarters.
Our open rates dropped. Should we be worried?
Probably not, and you should mostly stop watching that number. Apple's Mail Privacy Protection auto-loads tracking pixels for Apple Mail users, which inflates a large share of reported opens and makes the metric unstable in ways that have nothing to do with your email.
Watch click rate, placed-order rate and revenue per recipient instead. Those cannot be faked by a privacy proxy, and they are what the flows are actually being judged on.
Should we buy or rent a list?
No, and it is not a philosophical answer. People who did not sign up complain, complaints are measured against a 0.3 percent enforcement threshold, and a sustained breach triggers bulk filtering that takes weeks of clean sending to recover from.
Buying a list does not add revenue, it puts the revenue you already had at risk. The same logic applies to importing an old list from a previous platform without re-permissioning it.
Do we need Klaviyo specifically?
It is what we default to for Shopify brands, because the ecommerce data model and the flow triggers are built for it and most of the published benchmark data comes from that platform, which makes comparison honest.
Omnisend and others are perfectly capable. The platform is rarely the constraint. Six flows built properly on a cheaper tool beats two flows on the best tool on the market.
How long does a flow build take?
The first three flows, welcome and cart and checkout, are usually live inside two to three weeks and start producing immediately because they run on traffic you already have. The full six-flow architecture plus segmentation takes six to eight weeks.
Deliverability work runs alongside it, and if authentication is not in place that goes first. There is no point building flows that land in spam.
Will more email annoy our customers?
Badly targeted email will. Flows are the opposite of a blast, since they fire on something the person actually did and go to one recipient at a time, which is why they convert at roughly thirteen times the rate of campaigns.
The complaint rate tells you the truth here, and it is a number we watch weekly rather than a matter of opinion. If it moves toward 0.1 percent we slow down, whatever the revenue is doing.
The rest of the system
Retention is one of five
Email is what makes the expensive channels affordable. Every point of repeat rate it adds raises what you can pay for a customer everywhere else, which is why it is built early rather than last in the whole ecommerce practice.
Next step
Thirty minutes.
Open your flows tab.
We will look at what is live, what is switched off, and what your complaint rate has been doing, then tell you the three-flow build order that is worth the most at your revenue.
No obligation · Usually booked 1-2 days out