Upstack vs Aimerce

A durable ID is a longer-lived cookie. Identity resolution matches a visitor against a graph of known devices and identifiers. The first survives until the cookie is cleared or the device changes; the second survives both. That is the whole argument, and everything else on this page is a consequence of it.

Yes — Durable ID is their headline feature, a persistent first-party identifier they say lasts a year against Safari’s seven-day cap, with cross-device matching and express-checkout click ID relinking. It is a good product. We are comparing on how deep the resolution goes, not on whether the capability exists.

Upstack brands average a 45–55% revenue lift. Aimerce’s own published case study puts their figure at roughly 17%. The connector is not the difference — both push profiles and events into the same flows. How many visitors get identified before that happens is. A flow cannot convert a customer Klaviyo cannot recognise.

Yes, and they are unusually explicit about express-checkout loss, which most tools in this category do not mention at all. Ours are re-associated through identity rather than storage, which restores roughly 30% more of them in our testing — including when the customer changed device between the click and the purchase.

Theirs. Thirty days free plus a 30-day refund window, against our 21-day trial. We have a 60-day ROI guarantee on Scale and above, but on trial length alone they are ahead.

On Growth at $499/mo and Enterprise, yes. Their Essential tier at $299 covers signal delivery, Klaviyo revenue amplification and EMQ dashboards, but not attribution analytics, user journeys or custom events. Upstack includes attribution from $99, though identity resolution rather than reporting is the reason to switch.

Aimerce Essential is $299 for 1,000 orders, then $0.10 per order above that; Growth is $499 for 10,000. Upstack Signal starts at $149 and Attribution at $99. Overage is the same on every plan: $0.10 per extra order at 750, $0.08 at 3,000 and 10,000, then $0.05 from 15,000 orders up.

For a week or two, yes, and honestly you should — both install in about twenty minutes without a developer and neither requires DNS changes. Permanently, no: you would be paying twice for overlapping event forwarding and risking duplicate conversions. Most brands run 7–14 days in parallel, compare match rates on their own traffic, then cut over.