What is cross-device tracking?

Cross-device tracking is the process of recognizing or associating a user’s activity across multiple devices, such as smartphones, tablets, laptops, and desktop computers. It helps marketers understand how a person interacts with a brand across different devices and can be used for advertising, personalization, attribution, and measurement.

How Cross-Device Tracking Works

A user might:

1. See an advertisement on their smartphone.
2. Visit the brand’s website on their tablet.
3. Research the product on a laptop.
4. Complete the purchase on a desktop computer.

Cross-device technologies attempt to connect these interactions to understand the broader customer journey.

Common Methods

• Deterministic matching: Uses known identifiers, such as a logged-in account, to associate activity across devices.
• Probabilistic matching: Uses signals such as device characteristics, IP information, location, and behavioral patterns to estimate that multiple devices belong to the same person or household.
• Authenticated data: Login-based environments can provide a stronger way to connect activity across devices.
• Advertising and analytics platforms: Platforms may use their own permitted signals and identifiers for measurement and audience management.

Why Cross-Device Tracking Is Used

• Customer journey analysis: Understands interactions across multiple devices.
• Ad attribution: Helps determine whether advertising exposure contributed to a conversion.
• Frequency management: Helps advertisers avoid showing excessive ads across devices where supported.
• Personalization: Can support more consistent experiences across devices.
• Audience measurement: Helps estimate the reach and behavior of users across different devices.
• Campaign optimization: Provides additional insights for allocating advertising budgets.

Privacy Considerations

Cross-device tracking can raise privacy concerns because it involves linking activity across devices. Its use is therefore increasingly affected by privacy regulations, browser restrictions, platform policies, consent requirements, and user choices.

In short: Cross-device tracking connects or associates user activity across multiple devices to provide a more complete view of the customer journey and improve advertising measurement, targeting, and personalization.