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 homepage customer results range from 14% to 188% for individual stores. 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 recognize.

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: 30 days free against our 21. We have a 60-day 4x ROI guarantee, but on trial length alone they are ahead.

Some, on Growth and up: Aimerce lists attribution analytics and user journeys, but publishes no attribution models, margin or LTV reporting. Its core is server-side tracking: signal delivery, Durable ID and Klaviyo revenue amplification. Upstack Signal is the comparable plan, and identity resolution rather than reporting is the reason to switch; add Upstack Attribution from $99 if you also want reporting.

Aimerce Essential is $299 for 1,000 orders, then $0.10 per order above that; Growth is $499 for 10,000, then $0.05. Upstack Signal, the plan to compare, is $149 up to 1,000 orders, $249 up to 3,000 and $399 up to 10,000. Overage is the same on every plan: $0.10 per extra order up to 1,000, $0.08 up to 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.