Upstack AudienceThird-party visitor identification
Audience matches anonymous visitors to verified contacts from our partner data network, then delivers them to Klaviyo, Omnisend and Meta.
An add-on to a Signal plan, on the same pixel. 14-day free trial.
Visitors on your store
Sample profile Anonymous visitor · 3 product views
Jordan M. Identified
Klaviyo
Added to the UpstackData list
Meta
Sent through the Conversions API
Delivers to
Klaviyo 
Omnisend Meta The gap
Browse and cart abandonment flows need a contact. A shopper who never signed up never gets one.
Browse abandonment flow
Viewed product Triggered
Send email No contact
Upper-funnel events arrive with too little identity to match, so Meta is slow to learn who your buyers are.
PageView
IP address, browser Sent
Email, phone
The click cost the same whether or not the shopper left a contact. Audience gets more from traffic you have already bought.
Example
Ad click
Product view, add to cart
Session ends No contact left
How it works
Anonymous visitors are matched against our partner data network. One match can carry a name, demographics and several emails or phone numbers.
Example
Anonymous visitor
1 match Name, demographics, 2 emails, 1 phone
Every email is verified before it goes anywhere, so only contacts that pass reach your lists.
Example
jor•••@gmail.com Verified
j.m•••@outlook.com Verified
jm•••@oldmail.net
New shoppers go to Klaviyo or Omnisend, and the same match goes to Meta through the Conversions API.
Klaviyo UpstackData
Klaviyo UpstackData Reactivate
Omnisend New contacts
Meta Conversions API
In Klaviyo, new shoppers land on a list called UpstackData. Shoppers already in your account go to UpstackData Reactivate instead of being duplicated.
What you get
Verified contacts for shoppers who never filled in a form.
Welcome and abandonment flows can fire for visitors who used to be anonymous.
Page views and add-to-carts reach Meta with verified identity, so it finds new buyers faster.
Shoppers already in Klaviyo go to a reactivation list instead of becoming second profiles.
Results
Pilot results from a Shopify apparel brand, September 2025.
Pricing
One identified visitor is one match, even when it carries several emails or phone numbers.
$0.025 per resolved match, falling as your volume grows
| Package | Matches a month | Per match | Billed monthly |
|---|---|---|---|
| Starter | 8,000 | $0.025 | $200 a month |
| Growth | 25,000 | $0.020 | $500 a month |
| Scale | 80,000 | $0.015 | $1,200 a month |
Billed monthly on a yearly plan. Unused matches roll over to the next month within your term. Above 80,000 matches a month is quoted.
Pick a monthly package of matches, billed monthly. The rate per match drops as the package grows.
Try it on your own traffic, then move to a yearly plan you can opt out of within 60 days.
Audience is an add-on to a Signal plan, on the same pixel.
Compare
| Feature | Upstack Audience | Retention.com | Opensend | Tie (formerly Revenue Roll) |
|---|---|---|---|---|
| Data source | Third-party partner data, opt-in basis | Opted-in partner marketing network | Opt-in consumer profiles | Consented graph, double opt-in |
| Delivers to | Klaviyo, Omnisend and Meta | Klaviyo, Attentive, Omnisend and 9 more ESPs | Klaviyo, Meta, Google, TikTok and more | Klaviyo, Attentive, Postscript, Meta, Google |
| Meta | Conversions API events at EMQ 8+ | Enriched Custom and lookalike audiences | Event data to ad platforms (Ignite) | Custom audiences from Tie IDs |
| Shoppers you already have | Reactivation list, never duplicated | Flows fire for known subscribers | Recognized across devices (Reconnect) | Recognized after a device or session change |
| Pricing | From $0.025 per resolved match, from $200 a month | Not published | From $400 a month billed annually ($500 monthly), $0.168–$0.25 per identity | From $9K a year prepaid; ID from $18K |
| Free trial | 14 days | 14 days | 14 days for $1 | 7–30 day proof of concept |
Competitor details are taken from each vendor’s own website, checked October 2026.
Signal and Audience
Signal · First-party
Signal links a returning shopper’s sessions, devices and identifiers to one person using your own data, matched against our 750M+ device graph. Identity persists for the life of the customer, not the life of a cookie.
Audience · Third-party
Audience matches anonymous visitors against external partner data to supply a contact you did not have. It is how you grow your email list, and give Meta better matches at the top of the funnel, from traffic you are already paying for.
Data and privacy
Matches come from external partners whose consumer data is collected on an opt-in basis.
California residents can opt out under the CCPA.
Every email is verified before it reaches your lists.
Common questions
The Upstack pixel sees the visit, and Audience looks the visitor up in our partner data network. When there is a match, the email is verified and the shopper becomes a known contact, even though they never filled in a form on your site.
Signal uses your own first-party data and our internal device graph to recognize customers you already have, across sessions and devices. Audience uses third-party data from outside partners to find shoppers you have never had a contact for. One recognizes; the other adds.
To your email platform and to Meta. New shoppers are added to Klaviyo or Omnisend so your flows can reach them; in Klaviyo they land on a list called UpstackData, and shoppers already in your account go to an UpstackData Reactivate list instead of being duplicated. The match is also sent to Meta through the Conversions API.
No. Before creating a profile, Audience checks whether the shopper is already in your Klaviyo account. If they are, they go to the reactivation list rather than becoming a second profile.
Most visitors reach Meta with little more than an IP address and a browser, so page views and add-to-carts match poorly. Audience adds verified emails and phone numbers to those upper-funnel events, which lifts their Event Match Quality into the 8+ range. Meta can then find and target new buyers earlier in the funnel, and faster.
Yes. Resolved matches include demographic data from our partner network alongside the contact details, so you can segment new contacts from the day they arrive.
From $0.025 per resolved match, falling as your volume grows. One identified visitor is one match, even when that match carries several emails or phone numbers. Packages start at $200 a month for 8,000 matches, billed monthly on a yearly plan.
Yes, 14 days. After the trial, Audience runs on a yearly plan, and you can opt out within the first 60 days.
Yes. Audience runs on the Upstack pixel and the identity Signal resolves, so it is sold as an add-on to a Signal plan.
From external data partners whose consumer data is collected on an opt-in basis. California residents can opt out under the CCPA.
Count the contacts it adds and the revenue your flows earn from them, then check Event Match Quality on your upper-funnel events in Meta Events Manager. Attribution shows whether new-customer CPA moved. We agree the measurement window with you before switching it on.
Request a demo and we will show you how many of your anonymous visitors Audience can identify before you commit to anything.
