One campaign, every screen: planning across web, in-app and CTV

Most campaigns now run across several screens, but many are still planned as separate buys stitched together at the end. The result is uneven frequency, creative that doesn’t fit the environment and reports that can’t be compared. This post offers a practical way to plan one campaign across desktop, mobile web, in-app and connected TV (CTV) so each screen does a clear job and the whole plan can be measured as one.

Give each screen a job

Screens differ in how people use them, and that should shape what you ask of each one. A useful starting point is to assign a primary role per screen, then check that the roles add up to your campaign objective.

• CTV is a lean-back, shared, sound-on environment. It’s strong for reach and storytelling at the top of the funnel, and it reaches audiences who watch less traditional TV.
• Desktop web suits considered attention: people researching, comparing and reading. It works well for detail, longer formats and driving site visits.
• Mobile web catches people in short moments between other activities. It’s effective for reinforcement and quick actions, especially with formats built for a phone held upright.
• In-app reaches people inside environments they return to often, such as news, games and utilities. It’s useful for frequency and engagement, and formats range from native units to full-screen video.

These roles aren’t rules. A retailer might lean on mobile for conversion while a streaming launch leans on CTV. The point is to decide deliberately rather than splitting budget evenly by habit.

Plan around audience and outcome, not channel

Cross-screen plans go wrong when each channel gets its own targeting, its own KPIs and its own team. Start instead from a single brief:

1. Who you want to reach, described the same way for every screen.
2. What you want them to think or do, with one primary outcome for the whole campaign.
3. How each screen contributes to that outcome, based on the roles above.
4. When each screen should carry more weight, for example CTV early in a flight and mobile closer to a purchase window.

With that brief in place, budget allocation becomes a discussion about which screens best serve each stage, not a negotiation between channel owners. Hold back part of the budget so you can shift spend once early results come in.

Manage frequency across devices

Frequency is where separate buys cause the most damage. Each channel may respect its own cap while the same household sees the ad far too often in total, and meanwhile a different part of the audience is barely reached.

Perfect cross-device frequency control isn’t realistic. Device IDs are restricted, cookies are fading and CTV is usually identified at the household rather than the individual level. You can still get much closer with a few practical steps:

• Set caps at campaign level first, then divide them across screens, instead of capping each channel independently.
• Reduce the number of buying paths. Every extra platform or reseller holding its own frequency counter makes overlap harder to see. Buying multiple screens through one access point keeps more of that logic in one place.
• Use sequencing where you can. Let CTV introduce the message and use web and in-app to follow up, rather than showing the same spot everywhere at once.
• Watch reach curves, not just impressions. If impressions keep rising while new reach flattens, frequency is probably piling up on the same people.

Adapt creative to the screen

The same video file rarely performs equally well on a TV, a laptop and a phone. Adapting creative doesn’t have to mean producing several campaigns. It means planning versions from the start.

• CTV: assume sound on and a distance from the screen. Use large text, a clear brand presence early and a call to action that doesn’t depend on clicking, such as a search term or a QR code.
• Desktop: there’s room for more detail and interactivity. Horizontal video and richer display units fit here.
• Mobile web and in-app: assume sound off and a vertical screen. Put the brand and message in the first moments, add captions and design for thumbs, not cursors.
• Native placements: match the tone of the surrounding content, with headlines and images that make sense without the video.

Plan the shoot or design work with these versions in mind. Framing a scene so it can be cropped to vertical costs little upfront and a lot to fix later.

Keep measurement consistent

Cross-screen reporting breaks down when each channel defines success differently. Before launch, agree on a shared measurement plan:

1. Common definitions. Decide what counts as a completed view, a viewable impression and a conversion, and apply those definitions everywhere possible. Where environments genuinely differ, such as CTV where clicks aren’t available, document how you’ll compare.
2. One naming taxonomy. Use the same campaign, creative and audience names across every platform so data can be combined without manual cleanup.
3. Outcome measures above channel metrics. Brand lift studies, site visits, search lift or sales data show whether the combined plan worked. Channel metrics explain why.
4. Holdout groups where possible. Comparing exposed and unexposed audiences is the most reliable way to see what the campaign actually caused.
5. Transparency on placement. Real-time insight into where ads run lets you tie results to specific environments rather than guessing.

Viewability and completion rates are useful signals across all of these screens, but they have limits of their own and shouldn’t be the only yardstick.

Vortex gives buyers one access point for desktop, mobile web, in-app and CTV, with curated inventory and transparent supply paths. To plan your next cross-screen campaign, explore Vortex for advertisers.