Upstack vs Instant

An AI email and SMS suite with an identity layer, or tracking and identity infrastructure for every channel you run.

Choose Instant if

you want one platform that identifies shoppers and sends the email and SMS, which Upstack does not: it suits brands above $250k a month in revenue, and lists email at $1,000 a month.

Choose Upstack if

you keep Klaviyo and want measurement across every channel: Signal is $249 a month at 3,000 orders, or $349 with Attribution.

By Michael Alt, Founder & CEO Instant’s prices and features checked against its own pricing pages on October 24, 2026

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What it costs

Priced on different units.

These are not priced on the same unit, so this is an orientation rather than a like-for-like comparison.

Your stack today

Instant

Instant AI (ESP) $1,000 listed
Instant Audiences (identity) not published
Cross-channel attribution not the product
Email and SMS sending email included; SMS from $0.009 a message

$1,000 / month listed for email

Instant prices by store revenue and confirms the price on a demo; $1,000 is its listed email plan. Month to month, no setup fee. If you have a quote from them, bring it to the call and we will compare honestly.

With Upstack

Upstack Signal

Signal, 1,000 orders $149
Identity resolution Included
Klaviyo enrichment Included
Email and SMS sending not included

$149 / month

Upstack Signal, the tracking plan: tracking, identity resolution and Klaviyo enrichment for every channel you spend on. Add Attribution for reporting.

How they differ

Three differences between infrastructure and a marketing suite.

Instant and Upstack are not really alternatives. They built a retention marketing system with an identity layer; we built measurement and delivery infrastructure. Here is where that distinction actually bites.

Instant sends the email; Upstack doesn’t

Instant AI is an ESP with flows, campaigns and send-time optimization; Instant Audiences is the identity layer that feeds it or Klaviyo. If you want a system that identifies a shopper and then emails them, that is what they built. Upstack identifies the shopper and makes every channel measurable. We do not send the email.

Reporting on every channel, Instant’s included

Instant’s reporting is oriented around the revenue its own flows generated. Upstack reports across every channel you spend on, with three attribution models, contribution margin and cohorts. That includes the revenue Instant would attribute to itself.

Both do server-side delivery. Only one reports on all of it

Instant does send server-side, identity-enriched events to Meta’s Conversions API with deduplication, and we are not going to pretend otherwise. The difference is what happens after: their events feed retention, ours feed retention, prospecting, and the reporting you make budget decisions from.

Feature by feature

Instant vs Upstack: features and pricing compared

Feature

Instant

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Reviews

What brands say about Upstack

From the Shopify App Store and X, quoted in whole paragraphs, with a link to each one.

Read all reviews

Maelove Skincare United States · 3 months using the app

After testing out and surveying a number of platforms in this space, we onboarded with UpStack based on a strong recommendation. It's been a few a months now and absolutely no regrets.
We've seen Event Quality Match scores in meta increase, adding reliable NC purchase, NC CPA and NC ROAS metrics in ad manager is massively helpful as we're very focused on optimizing for NC, Klaviyo abandon flows are picking up significantly more revenue outside of our standard abandon flows (this alone generates a very solid ROI on using UpStack).

Shopify App Store · 5 out of 5 · Aug 23, 2024
Johnny Hickey @johnhickey1970

i use upstack. wouldn't do without it and I tested much of the competition

X · Jun 25, 2026
James Lee @jameshyujinlee

Bily broke down during BFCM one time. It broke again for one of our accounts and they were not able to fix the issue. Talked to Michael the next day and migrated over to Upstack. Everything went back to normal.

X · Jan 5, 2025

Common questions

Instant vs Upstack: identity, tracking and running both

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 sends events to Meta’s Conversions API with a de-duplication ID shared with the Pixel. 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: three attribution models, contribution margin, cohorts, and enrichment that feeds the Klaviyo you already run instead of replacing it.