Comparison
Upstack vs Instant
Instant is a retention marketing suite — an AI email and SMS platform with an identity layer feeding it. Upstack is measurement and delivery infrastructure. The overlap is that both recover shoppers your tools lost; the difference is that Instant then sends the email itself, and we make every channel you already run measurable.
15 minutes · no credit card · no commitment
By the numbers
Why Brands choose Upstack Data
Infrastructure
not an email platform
Attribution
included at $249
Every channel
not just retention
Feature by feature
Instant vs Upstack Identity Resolution Feature Comparison
| Feature |  | Instant |
|---|---|---|
| Category | ||
| What it is | Tracking, identity and attribution infrastructure | Retention marketing suite — AI ESP, identity layer, agents |
| Sends email and SMS | Nowe feed Klaviyo | YesInstant AI is a full ESP |
| Works alongside Klaviyo | Yespurpose-built enrichment | YesAudiences can feed Klaviyo |
| Replaces your ESP | No | Optionally, yes |
| Identity & delivery | ||
| Identity resolution | Native cross-device lifetime ID | Persists identity for opted-in shoppers who identified themselves on your site |
| Basis | First-party, consented | First-party, opted-in — per their documentation |
| Server-side Conversions API | Yes | YesInstant Targeting, with deduplication |
| Cross-device | Yes | Yes |
| Klaviyo flow enrichment | Yes | Yes |
| Reporting | ||
| Attribution across all channels | Yesfour models | Reporting oriented to their own flows |
| Contribution margin (CM1–CM4) | Yes | Not publicly documented |
| LTV, payback and cohorts | Yes | Not publicly documented |
| Prospecting and upper-funnel measurement | Yes | Not the product’s focus |
| Pricing & terms | ||
| Model | Per order | [per contact / per plan — confirm] |
| Published pricing | Signal $149 · Attribution $249, by order band | Published from [$99] |
| Attribution included at | Attribution, from $249 | Not an attribution product |
| Company | Founder-led, US-based | Australian, venture-backed |
From brands who switched
What they said after moving.
“We have extended experience with other options out there. This is the best experience and the steadiest results I have seen across any other software we have worked with.”
HEALiX Infraredpreviously ran four tracking tools “Setup took one call. The thing I did not expect was someone actually looking at our subscription app and our checkout extensions before switching it on.”
Shopify App Storeverified review “We looked at several competitors and talked to some of their customers. From our research, Upstack was by far the clear winner in terms of data accuracy, customer service and pricing.”
Shopify App Storeverified review
Sources for the Instant figures on this page
Common questions
Upstack vs Instant, answered.
Does Instant share data between brands?
We have no evidence that it does, and their documentation describes the opposite: identity is persisted for shoppers who identified themselves on your own site through a newsletter form, a checkout or a log-in. An earlier version of this page claimed otherwise and we have removed it. If you are evaluating both, ask them directly rather than taking a competitor’s word for it — including ours.
Does Instant do server-side tracking?
Yes. Instant Targeting sends identity-enriched events to Meta’s Conversions API with deduplication against browser events. That part of their product does the same job as ours.
Then when would I choose Upstack?
When you want measurement across everything you spend on rather than a retention engine — four attribution models, contribution margin, cohorts, and enrichment that feeds the Klaviyo you already run instead of replacing it.
When would I choose Instant?
When you want one system that identifies the shopper and sends the email. We do not do the second half at all.
Can I run both?
Yes, and it is a reasonable setup: Upstack for collection, resolution and measurement, Instant for retention execution.
See it on your own data.
Start a free 21-day trial. Setup takes under 20 minutes, and the 60-day ROI guarantee on Scale and above means the downside is your time.