DOOH is digital out-of-home advertising: ads shown on digital screens in public places, such as roadside billboards, transit stations, airports, malls and gym or office screens. Programmatic DOOH (pDOOH) is the same inventory bought through software. A demand-side platform (DSP) bids on individual ad plays through a supply-side platform (SSP), instead of a buyer negotiating a fixed schedule with a media owner.
The screen is the same in both cases. What differs is how you plan, buy, change and measure the campaign. This guide covers that difference, when each approach is the better fit, and what pDOOH cannot do. For the wider picture, see our guide to programmatic DOOH.
1What is DOOH (the traditional way of buying it)?
In a traditional DOOH buy, you or your agency work directly with a media owner such as a billboard operator or a transit network. You agree on specific screens or a network, a flight window, and a share of a loop. A loop is the repeating sequence of ads on a screen. If a loop is 60 seconds long and has six advertisers each running 10 seconds, your ad plays for 10 seconds out of every minute while the contract runs.
Price is usually a fixed fee or a CPM based on the owner's estimate of how many people pass the screen. Booking involves an insertion order, creative delivered to the owner, and often a lead time of days to weeks. Changing the plan mid-flight means going back to the seller.
2What is pDOOH?
Programmatic DOOH connects the same screens to the programmatic ecosystem. Media owners make their screens available through an SSP or exchange. A buyer sets up a campaign in a DSP with targeting, budget, a bid and creative. When a screen has a play available, the SSP sends an opportunity to the DSP. The DSP decides whether to bid and, if it wins, the creative is delivered to the screen.
Unlike web display, a DOOH impression is not one person seeing one ad on a personal device. Most platforms define an impression as an estimated number of people likely to see a screen during a play, using venue data, traffic counts or mobile location data. This is why two platforms can report different audience numbers for the same play. Ask every vendor how its impression multiplier is built.
In practice there are variations. Some pDOOH buys are programmatic guaranteed or private marketplace (PMP) deals with a specific owner. Others are open-exchange bidding. Many DOOH platforms combine both. Whichever route you use, ad operations work (deal setup, creative specs, QA and reporting) still applies.
3Who does what in the pDOOH chain
The pDOOH ecosystem uses a few terms that are easy to mix up. Roles below are described in general terms. Many vendors do more than one job and change their product mix over time, so check each vendor's current offering before you choose.
| Role | What it does | Examples (check current offering) |
|---|---|---|
| DSP | Lets the buyer plan, bid, set budgets and report across screens | Vistar Media, Hivestack, and DSPs that also buy DOOH inventory such as The Trade Desk, DV360 and Amazon DSP |
| SSP / supply platform | Connects screens to buyers, applies floors and manages deals | Place Exchange, Hivestack and Vistar Media each operate supply-side technology; Broadsign is best known as a CMS and supply-side provider |
| CMS (content management system) | Software that schedules and plays content on the screens themselves | Broadsign and similar screen-management systems |
| Media owner / operator | Owns or manages the physical screens and sells the space | Billboard, transit, street furniture and venue networks |
| Measurement provider | Estimates audiences and verifies plays and exposure | Mobile location data and venue traffic partners; proof-of-play from the CMS |
A common mistake is to call every platform a DSP. Broadsign, for example, sits on the supply and screen-management side, not on the buyer side. If you are comparing buying platforms, see our DOOH and pDOOH platform comparison for how the buy-side and supply-side tools differ.
4DOOH vs pDOOH: the practical differences
| Aspect | Traditional DOOH | Programmatic DOOH |
|---|---|---|
| How you buy | Negotiated with each media owner; insertion order | Through a DSP, using open exchange, PMP or programmatic guaranteed deals |
| Commitment | Usually a fixed flight on selected screens, sometimes with minimums | Budget-based; can often start, pause and shift without renegotiating, depending on the deal type |
| Targeting | By screen, venue type and market | Adds audience, location, time-of-day and trigger rules such as weather or events |
| Pricing | Rate card or negotiated CPM | Auction or fixed deal price; floors apply |
| Creative changes | Request a change from the owner; lead times vary | Swap creative in the DSP, subject to each screen network's approval process |
| Reporting | Owner-provided proof-of-play and estimated impressions | Play and impression logs through the platform, plus any third-party measurement you add |
| Setup work | Booking and creative delivery | Deals, floors, creative specs per network, screen-level QA, pixel or measurement setup |
5When each approach is the better fit
Direct buying still makes sense when
- You want one specific, high-profile location, such as a landmark billboard, a fixed airport takeover or a sole-sponsorship of a venue.
- The owner does not sell programmatically, or only part of its inventory is on an exchange.
- You want a guaranteed share of voice with a fixed creative sequence, which is easier to negotiate directly.
- You need a special format, for example a custom or interactive build that exchange specs do not support.
pDOOH is usually the better fit when
- You want to cover a market or several markets from one platform and shift budget between screens as results come in.
- You need audience or location rules, such as targeting near store locations or specific times of day.
- You plan to run DOOH alongside CTV, display and social, with shared budgets and reporting.
- Your campaign is smaller or shorter, and a negotiated contract would be hard to justify.
Many brands use both: a direct buy for a flagship placement and pDOOH for reach and flexibility. The goal is a plan that matches what you need, not a platform preference.
6Cost and minimums
Cost structures differ more than headline CPMs suggest. Direct buys often come with a negotiated rate and a minimum commitment per owner. pDOOH usually has no per-owner commitment, but platforms and managed-service teams set their own minimum budgets, and prices vary by market, venue type and time of day. Rather than comparing a single CPM figure, ask each seller for the cost per thousand plays and the assumed audience multiplier behind it. Our guide to how programmatic DOOH pricing works explains the fee layers: media cost, platform fee and any data or measurement fee.
7What pDOOH cannot do
pDOOH is more flexible than a fixed buy, but it has limits that are easy to overlook.
- It cannot count individuals. You do not get a per-person frequency cap as you would in online display. Audience figures are modeled from venue, traffic or mobile location data.
- It cannot guarantee that someone looked at the screen. Plays are logged, but attention is estimated.
- It does not remove the need for QA. A screen network may reject a creative file, play it at the wrong size or show a blank slot. Proof-of-play reports are how you catch this. See our proof-of-play guide.
- It does not give every owner's screens. Some inventory is available only through direct deals, and availability differs by country.
- Attribution is directional. Footfall and sales-lift studies compare exposed and unexposed groups. They are useful, but treat them as estimates and ask how the control group was built.
8What the operations work looks like
Whether you buy direct or programmatically, a DOOH campaign needs the same careful setup. In pDOOH, the checklist usually includes the following.
- Confirm the deal type (open exchange, PMP or programmatic guaranteed) and the deal IDs and floors for each supply source.
- Collect each screen network's creative specs: dimensions, file type, duration, file size and any content restrictions.
- Build the audience, venue and time-of-day rules in the DSP, and check that each rule actually matches inventory.
- Set up measurement: proof-of-play logs, any footfall or sales-lift study, and tracking for companion channels.
- Check delivery in the first days: are plays logging against the right deals, in the right venues and dayparts?
If you want help running this, our programmatic DOOH advertising service covers campaign setup, creative QA and reporting, and we can work with the platform you already use.
9Summary
DOOH and pDOOH use the same screens. Traditional buying gives you control over specific placements. Programmatic buying gives you flexibility, audience rules and shared reporting with other channels, at the cost of modeled audience figures and more setup. Choose the approach that suits each part of your plan, ask vendors how they measure impressions, and make sure someone owns the QA. If you would like to talk through a plan, get in touch.
