Klaviyo flows that finally fire.
Your abandoned cart emails aren’t reaching the people who need them. Upstack Flow re-identifies “lost” customers and feeds them back into your automation — turning silent flows into revenue machines.
Perfect White Tee recovered $92K/mo in incremental flow revenue. Champo added $24K/mo. Montreal Weights recovered $55K in 90 days.
Trusted by DTC brands recovering $24K\u2013$92K/month in Klaviyo flow revenue
4.9/5 on Shopify App Store
1,000+
Brands
actively running Upstack
40%+
Matched events
average signal uplift
<20 min
Setup
most brands go live
Klaviyo can’t email customers it doesn’t recognize.
Klaviyo flows only fire when Klaviyo knows who someone is. But cookies expire in 7–20 days. Sessions break across devices. Profiles go cold. The result? Your abandonment flows are missing 40–50% of profile volume — and returning customers are being treated as strangers.
It’s not the flows. It’s not the email creative. It’s not Klaviyo itself. When a returning visitor can’t be matched to their Klaviyo profile, the flow never triggers — and that’s easy revenue walking out the door.
The customer journey that breaks
| Stage | Without Flow | With Flow |
|---|---|---|
| Visits site on phone (Meta ad click) | Cookie set | Cookie set + persistent ID created |
| Adds to cart, gets distracted, leaves | Abandoned cart email sent (if identified) | Abandoned cart email sent (if identified) |
| Cookie expires in 7 days | Identity lost | Persistent ID retained for up to 1 year |
| Returns on desktop 2 weeks later | Klaviyo: "Who is this? Never seen them." | Upstack ID: "Same person from 2 weeks ago" |
| Browses again, leaves again | No email sent. Revenue lost. | Re-identified → flow triggers → revenue recovered |
“These were known customers… but they were being treated like strangers.”
— Perfect White Tee
Same flows. More people. More revenue.
Upstack Flow doesn’t create new emails or new flows. It feeds more qualified profiles into your existing automation. The flows are already built and tested — they just need more people entering them.
Connect
A single integration connects your identity layer to Klaviyo. No flow rebuilds, no new templates. Your existing automations stay exactly as they are.
Re-identify
Upstack ID recognizes returning customers — even after cookies expire, devices change, or sessions break — and feeds that identity back to Klaviyo.
Activate
Abandoned cart, browse abandonment, and win-back flows trigger for customers Klaviyo couldn’t see before. Revenue recovers without building a single new automation.
How identity feeds Klaviyo
$24K–$92K/month in recovered flow revenue.
| Metric | Without Flow | With Flow |
|---|---|---|
| Flow volume | Baseline | 1.8x |
| Abandonment flow coverage | 50–60% of visitors | 90%+ |
| Identity persistence | 7–20 days (cookie) | Up to 1 year |
| New contacts added | — | Zero |
| Klaviyo bill impact | — | $0 increase |
| Time to flow volume lift | — | First 2 weeks |
Perfect White Tee
+$92K/mo recovered
8-figure brand. Incremental flow revenue of $92K/month within 60 days. Flow volume increased 1.8x. Driven email revenue up 85%. Head-to-head test proved competitor was cannibalizing, not adding.
Champo
+$24K/mo in abandoned carts
7-figure British haircare brand. Flow revenue increased 54% in 60 days. Identified 128% more customers (28K → 64K). 36,000 additional profiles recovered monthly.
Montreal Weights
$55K recovered in 90 days
DTC fitness brand. Recovered $55K in abandonment revenue in 90 days. ROAS improved 15%. New customer CAC reduced 10%. Setup completed in under 20 minutes.
“These were emails that would’ve never been sent without Upstack. That’s not optimization — it’s recovered revenue.”
Johnny Hickey
CMO, Perfect White Tee
PWT had excellent Klaviyo flows that were underperforming. Upstack discovered the identity gap, re-identified lost customers, and recovered $92K/month in incremental flow revenue — without changing a single email.
How identity resolution feeds Klaviyo flows.
Upstack Flow doesn’t guess, model, or purchase data. It re-identifies your own customers using first-party signals — then reconnects them to the Klaviyo profiles they already have.
Exclusion logic prevents duplication
Upstack flows only trigger for users who missed standard Klaviyo automation. If Klaviyo already recognized the visitor, we don’t duplicate. Every email is genuinely incremental.
1-year identity persistence
Re-identifies visitors up to 1 year after their last session — compared to the 7–20 day cookie window most tools rely on. Cross-device stitching means phone, desktop, and tablet are one customer.
Profile reconnection, not profile creation
Only reconnects returning visitors to profiles that already exist in Klaviyo. No new contacts added, no list inflation, no deliverability risk.
All standard flow types supported
Abandoned cart, browse abandonment, win-back, and post-purchase flows all benefit. Any flow that depends on recognizing a returning visitor sees uplift.
Why it’s incremental, not cannibalized
Perfect White Tee ran a head-to-head test against another enrichment provider. The results were clear within 30 days: the other provider’s flows went to zero after proper setup — most of their value was cannibalizing existing flows. Meanwhile, Upstack’s abandonment flows showed a 50% increase in volume. Genuinely net-new revenue.
Your flows aren’t broken. Your identity layer is.
First-party re-identification, not third-party lists
vs. Retention.com, Opensend, etc.
Third-party enrichment tools purchase email lists and add unknown contacts — increasing your Klaviyo bill and risking deliverability. Upstack Flow re-identifies your own customers using first-party data. Zero spam risk. Zero new contacts.
Proven incremental, not cannibalizing
vs. third-party enrichment
Perfect White Tee ran a head-to-head test. The other provider’s flows went to zero after setup — they were cannibalizing existing flows. Upstack’s flows showed a 50% volume increase. Genuinely net-new.
Identity-first, not dashboard-first
vs. Triple Whale Sonar
Sonar is part of a $1,200+/month analytics suite with limited public proof for Klaviyo-specific lift. Upstack Flow starts at $299/month, with $92K/month proof from PWT alone. Identity resolution is the core, not an add-on.
Dedicated flow recovery, not a forwarding feature
vs. Littledata, Elevar
Server-side tracking tools forward events to Klaviyo but don’t solve the identity gap. They can’t reconnect lost visitors to existing profiles. Upstack Flow is purpose-built for flow recovery with cross-device, 1-year persistence.
Flow is part of the Upstack stack.
Upstack Pixel captures events. Upstack ID resolves identity. Upstack Enrichment adds contact data. Flow activates that identity by reconnecting visitors to Klaviyo profiles.
Frequently asked questions about Flow
Stop losing revenue to silent flows.
Your flows are ready. Your automations are built. The only thing missing is the identity layer that tells Klaviyo who’s actually on your site. Start a free trial — most brands see flow volume increases in the first two weeks.
Cancel anytime
Not ready for a trial? Book a 15-minute walkthrough or read our DTC tracking guide.