Who is behind the cart.
Matched against 289 million plus US consumers and billions of shopping signals, then written into Klaviyo as a real, permission-based profile. Segments fill in. Deliverability climbs.
New for Klaviyo K:BOS 2026
Every cart has a name.
CartID gives the anonymous carts on your Shopify store a name, a consent record and a live signal inside Klaviyo, in under a minute. Then it stops your ads chasing people who already bought.
- Works with every Klaviyo account
- Consent built in, ours or yours
- Live in minutes, no flow edits
- Pairs with IntentWave
Anonymous is expensive.
Out of every hundred carts, about 97 leave without telling Klaviyo who they were. Your retargeting follows them anyway. Then it keeps following the ones who already paid.
- carts leave without telling Klaviyo who they are
- 97 of 100
- of retargeting spend reaches people who already bought
- 8 to 12%
- a buyer can keep seeing your ads after checkout
- 48 hrs
- is what it takes to give every cart a name and a consent record
- 1 pixel
At a typical 2 to 3 percent conversion rate. The suppression-lag range is our estimate across the Shopify Plus accounts we have modeled.
The same three carts. Only one can talk to Klaviyo today. CartID changes that for the other two.
One cart. Three things Klaviyo never knew.
Install once. CartID reads the cart, matches it against the Persistent ID graph, captures consent, and hands Klaviyo a shopper instead of a session. Live, in the same minute.
- Shopify cartanonymous session
- CartIDidentity + consent, under 60 seconds
- Klaviyonamed, consented profile
- IntentWavelive signal out
- Meta · Google · TikTokbuyer suppressed, budget moved
Whether they said yes.
Captured the moment it is given, through ConsentWave or the CMP you already run, and carried with the profile. Every name that reaches Klaviyo is defensible and auditable on demand.
What they just did.
Added, abandoned or bought, the signal lands in under 60 seconds. Your Klaviyo flows react in the same minute. With IntentWave connected, so does your ad spend.
Stop paying for the sale you already made.
Take a Shopify Plus brand moving $1M a month in GMV and spending $150,000 a month on Meta and TikTok. An estimated 8 to 12 percent of retargeting spend goes to shoppers who already checked out, because the platforms hear about the sale a day or two late.
With CartID, the buyer has a name the moment the order lands. Paired with IntentWave, that name leaves your retargeting in the same session. That is roughly $12,000 to $18,000 a month back in spend that already works, before a dollar of new budget.
Illustrative model, not an audited result. Assumptions available on request.
Run your own numbersWhat a 12 percent lift does to your ROAS.
Set your monthly paid media, enter the ROAS you see today, and CartID shows the lift at a 12 percent improvement, the top of the modeled range. Then check whether your store qualifies.
$30,000$5,000 a day$300,000
x
$
Added revenue per month, same budget
$54,000
That is $648,000 a year, or the same revenue for $16,071 less. ROAS moves from 3.00x to 3.36x.
You qualify at these numbers. Confirm eligibility and we route you to merchant review.
Confirm eligibilityCartID and IntentWave.
Two products, one pixel, one graph. CartID gives every cart a name inside Klaviyo. IntentWave carries that name, and the consent behind it, to Meta, Google and TikTok, where the money is actually spent.
- Shopify cartanonymous
- CartIDidentity + consent
- Klaviyoidentified profile
- IntentWavelive signal to Meta, Google, TikTok
- Same minuteconverted buyer suppressed, budget redirected
Built for Klaviyo. Live in minutes.
Klaviyo opened its platform this month: 260 plus tools and 490 APIs. CartID uses them to make every account perform better without touching a single flow. Pick your door.
Script tag
One line in the theme
<script src="…/cartid.js" async></script>Drops into the Shopify theme like any other tag. No developer ticket.
Live in minutesApp install
One click, no theme edits
Shopify or Klaviyo app listing. Install, authorize, done. Consent and profile sync start on the first cart.
Live in minutesHeadless APIs
Straight into K:BOS 2026
Profiles and consent sync through the APIs Klaviyo just opened. No middleware, no CDP in between.
Live in minutesThe graph underneath.
Persistent Shopper Intelligence. The same identity spine behind work with Constant Contact, Deluxe Corporation, Microsoft and Shopify.
- US consumers in the Persistent ID graph
- 289M+
- Emails resolved and hygiened
- 4B+
- Shopping and intent signals
- 5B+
- Revenue growth across the active book, Jan to Jul 2026, on a flat customer count
- 79.7%
Growth figure from the active account base. Case files shared under NDA.
Run Klaviyo for a book of merchants?
One install per store. Every account you manage performs better on the channel you already own, plus a new revenue line with zero delivery burden. Your merchants keep everything they pay you for. Klaviyo's own scorecard goes up, in your hands.
Agency partner program
Full book rollout, day one.
- Platform access priced to your client count, not per store.
- Revenue share only on accounts that opt into paid social management.
- Founding partners lock a founding rate.
Built for merchants already past $1M a month.
CartID early access is a qualification-first program, not a generic lead funnel. Confirm eligibility and we route you to merchant review.
- Shopify or Shopify Plus merchant on Klaviyo, live and processing orders
- At least $1M in Shopify GMV per month
- At least $1,000 a day in paid media on Meta, Google or TikTok
- Klaviyo agencies welcome, with the accounts they run
You are in review.
We will reach out from persistent.id within two business days with next steps and an install window.