Click-Through Attribution (CTA)

What is click-through attribution?

Click-through attribution, often simply called «last-click attribution,» is one of the most fundamental and widely used attribution models in mobile marketing. It operates on a straightforward principle: when a user converts, the MMP looks back in time to find the last ad click that originated from your campaign and assigns 100% of the credit for that conversion to that specific click and its source.

A singular focus of CTA on the final click makes it a simple and clear-cut method for measuring campaign performance.

How does click-through attribution work?

The model operates on a simple rule: it identifies the final clicked ad before a conversion and awards it 100% of the credit. This makes it exceptionally useful for businesses focused on measuring immediate campaign ROI in channels where a click is a primary performance indicator.

To illustrate how CTA works, consider a typical user journey with multiple touchpoints:

1. They view a display ad (no click).

2. They click a link in a marketing email but don’t convert.

3. They later click a paid search ad and complete a purchase.

In this scenario, the click-through model ignores the display view and the email click, attributing the sale entirely to the paid search ad. This provides a clean, actionable signal for which channel ultimately closed the deal.

Benefits of click-through attribution

• Clear signal of intent: a click is a proactive indicator of user interest, making the data highly actionable.

• Simplified optimization: it provides a clean, unambiguous signal by crediting a single touchpoint, allowing for straightforward campaign analysis and budget allocation.

• Ease of use: its simplicity makes it easy to implement, understand, and communicate across teams.

• Agile performance marketing: the model is ideal for fast-paced, iterative testing and scaling, as it offers a clear and direct measure of what finally drove a conversion.

Limitations of click-through attribution

Despite its ease of use, the click-through model carries inherent risks due to its limited scope:

• Incomplete customer journey: it ignores the reality that in some cases customers engage with multiple ads (views, clicks, etc.) across different channels before converting.

• Misallocated credit: by rewarding only the last click, it undervalues the critical role of upper-funnel marketing efforts (like brand awareness campaigns) that initiate customer interest.

• Channel incompatibility: the model is ineffective for modern, non-clickable channels. For instance, Connected TV (CTV) ads can never receive credit, as users cannot click them and are unlikely to take immediate action, rendering their impact invisible in this framework.