What is an interstitial?
Interstitial is a full-screen ad format served between screens or between stages of app usage. Unlike a banner embedded in content, it creates a separate contact moment, usually at a transition point.
It is one of the best-known full-screen variants and that is why it appears frequently in mobile campaign plans.
When does it work well?
Interstitial gives strong exposure and can work well when the brand needs a clear, visible contact moment. At the same time, it is one of the formats most sensitive to execution quality. A bad serving moment can quickly turn high visibility into user frustration.
That is why performance depends not only on creative, but also on placement and on frequency control.
How does it work in practice?
Most interstitials appear between screens, fill the whole screen, and show one primary message or CTA. A well-implemented interstitial does not block the user longer than necessary and does not interrupt the task at the most sensitive moment.
In practice, it should always be considered alongside full-screen logic and within the wider role of display advertising.
How should it be measured?
The usual measures are visibility, time in view, CTR, engagement, and the impact of frequency on both result and user acceptance. It is also useful to observe quality signals such as instant closes or rapid exits.
The best test of an interstitial is not only “was it seen?” but also “was it tolerated and did it support the campaign goal?”.
When evaluating an interstitial, check:
- whether it appears in a natural break between screens,
- whether frequency does not create user fatigue,
- whether the creative has a simple message and clear exit,
- whether visibility is considered together with user experience.
Common misunderstandings
- Interstitial is not automatically bad. Poor use is what creates the problem.
- High visibility does not remove the need to think about UX.
- The format needs a clear role and an appropriate creative concept.