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Click-through vs view-through attribution: what's the difference and which counts?

Reviewed by Visprisca Ad Tech Engineering Team•Last updated: October 2026
Direct Answer

Click-through attribution (CTA) credits conversions to the last ad the user intentionally clicked. View-through attribution (VTA) credits conversions when an ad was displayed but not clicked, provided the conversion occurred within a set lookback window. You should separate CTA and VTA reporting to avoid overvaluing passive ad impressions.

Detailed Explanation

In digital advertising, attribution determines which ad exposure receives credit for a customer purchase or app installation. Click-through attribution is high-intent: the user physically tapped the banner or video.

View-through attribution acknowledges that advertising has branding value: a user sees an interstitial ad, does not click it at that moment, but searches for and downloads the app three hours later on their home Wi-Fi.

However, unconstrained VTA can be easily abused by unscrupulous ad networks buying cheap, low-viewability background banners to claim credit for users who were already going to convert organically. Bidding engines should treat CTA and VTA with different valuation multipliers.

Technical Definition: Lookback Window

The configured time span (e.g. 7 days for click, 24 hours for view) during which an ad impression or click is eligible to claim attribution for a conversion.

Illustrative Worked Example*Clearly labeled illustrative per Accuracy Rule

Weighing CTA vs VTA in Programmatic Bidding

A campaign records 100 conversions: 60 from CTA (7-day window) and 40 from VTA (24-hour window). Target CPA is $20.00.

›Unweighted Attribution: 100 conversions × $20.00 = $2,000 spend justified.
›Discounted VTA Policy (50% weight on views): Effective conversions = 60 + (40 × 0.50) = 80 conversions.
›Adjusted Budget Ceiling: 80 conversions × $20.00 = $1,600 maximum allowable media spend.
›Result: Bidding algorithm scales back aggressive bidding on high-frequency view-only ad formats that do not generate active clicks.

Applying a discount to view-through conversions prevents media waste on passive inventory.

What to Do Next

  • 1Audit your MMP settings and ensure VTA windows are capped at 24 hours (never 7 or 30 days).
  • 2Review your DSP reporting breakdown to inspect pure CTA CPA vs blended CPA.
  • 3Configure Rule Engine constraints to discount or exclude placements with high VTA but zero CTA.

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