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Opensend x Klaviyo: Power Real-Time Identity Inside Your ESP

Francesco Gatti

September 3, 2025

We're thrilled to officially announce Opensend’s partnership with Klaviyo, making Opensend the first and only identity resolution provider in Klaviyo’s App Marketplace that supports third-party data.

Klaviyo merchants can now access Opensend directly from their dashboards and start converting anonymous traffic into actionable customer profiles, getting deeper value from your ESP.

Why This Partnership Matters

For marketing leaders and CRM managers, turning anonymous site visitors into known customers is a constant challenge. With this new partnership, you can now access Opensend directly from your Klaviyo account, allowing you to capture and convert more anonymous traffic effortlessly.

Turn Anonymous Traffic into Klaviyo Profiles

Identify who’s on your site and act on it instantly, all from your Klaviyo dashboard:

  • Capture and resolve anonymous traffic in real-time.
  • Enhance audience segmentation directly within Klaviyo’s platform.
  • Trigger high-converting flows the moment intent appears

Build smarter segments. Launch faster campaigns. Maximize the value of every visitor, without complexity.

Who Benefits?

  • Marketing leaders and CRM managers: Achieve higher ROI through targeted campaigns.
  • Ecommerce brands: Gain real-time intelligence to elevate customer experience.
  • Partner managers and tech decision-makers: Streamline data strategies and automation efforts.

What marketers are saying

[Josh-Testimonial]

Your Tech Stack Just Got Smarter

With Opensend and Klaviyo working together, brands can tap into real-time identity, richer customer insights, and smarter activation, all from inside their ESP.

Let’s make the most of your data, together.

[get-your-personas]

Get The Ultimate Guide to Identity Resolution

Discover how first-party identity resolution can transform anonymous site visitors into actionable revenue, without relying on third-party cookies.
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7B+

Event Daily

In our network, we see the traffic for 100k+ US-based sites

180M

US Shoppers in Network

We have a 73% USA shoppers match rate

100%

Legally Compliant

We follow all the laws and regulations to always comply

End-to-end encryption

and consent-based partnerships
"Opensend has helped us grow our sales month over month ever since we started using their platform. The best part is that it's very easy to integrate with your Shopify and Klavyio account!"
Josh Colley
Co Founder, Track Barn

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Exclusive, blog only offer: Identify hidden visitors and boost conversions for only a dollar.
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Francesco Gatti

September 3, 2025

Before iOS 14: The rollout of ITP

Apple’s attempts to protect privacy and limit 3rd-party tracking scripts started way before iOS 14 was released in September 2020. 
In 2017, Apple began tightening cross-site tracking via the debut of Intelligent Tracking Prevention (ITP)—blocking 3rd-party cookies, shortening lifetimes for some 1st-party cookies, and generally sanding down “free” identifiers marketers had taken for granted.
If you felt your cookie windows shrinking in 2019, that was ITP 2.1 capping many JavaScript-set cookies to 7 days.

iOS 14: The mobile ID reset

With the release of iOS 14 in September 2020, App Tracking Transparency (ATT) made device-level ad identifiers opt-in, and Apple shipped privacy-preserving attribution options (e.g., Private Click Measurement on web/app-to-web).
In response, Google added WBRAID/GBRAID tracking parameters to keep some campaign measurement working in iOS flows where gclid was no longer viable.
Much more notably, seeing the writing on the wall for 3rd-party tracking pixels, Facebook released its Conversions API (CAPI) in 2020 to help advertisers track campaign engagement without complete dependence on Facebook Pixels.
References:

iOS 17: The link parameter squeeze & further limiting of cookie lifespans

With the release of iOS 17 in September 2023, Link Tracking Protection (LTP) started stripping known tracking parameters (think gclid, fbclid, msclkid) in Mail, Messages, and Safari Private Browsing.
UTM parameters typically continued to pass for aggregate reporting, but click-ID-only pipelines got shakier in these contexts.
References:
Perhaps more importantly, with the release of iOS 17, all Safari WebKit browsers (including desktop browsers) started deleting all tracking cookies set with 3rd-party JavaScript after 7 days of inactivity on a website.
References:

iOS 26/Safari 26: “Default-on” tightening

Now, in the fall of 2025, we are of course confronted by further tightening of 3rd-party tracking pixels with these default changes to click IDs.

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