What is DOOH (Digital Out-of-Home)?
Also known as: DOOH advertising, Programmatic DOOH
What is DOOH?
Digital out-of-home (DOOH) is advertising delivered to internet-connected digital screens in public spaces. The screens sit on roadside billboards, transit shelters, mall directories, gas station pumps, elevator panels, and stadium concourses. Per the OAAA 2024 OOH revenue report, US OOH spend hit $9.1 billion in 2024, with DOOH contributing 35.5 percent of total revenue and growing 7.4 percent year over year.
DOOH is OOH with software. The panel runs a content management system. Creative swaps in seconds. Pricing moves from a four-week poster buy to a one-second play that gets counted, capped, and optimized like any other digital impression.
The channel sits between connected TV and traditional outdoor in the media plan. It carries the reach and big-screen impact of TV. It carries the targeting and programmatic plumbing of digital. The two halves are what pushed DOOH from a static-panel sideline into a $3.2 billion programmatic line item in 2024.
[CITATION CAPSULE] DOOH is digital out-of-home advertising on internet-connected screens in public spaces. Per the OAAA, DOOH made up 35.5 percent of US OOH revenue in 2024, with total OOH at $9.1 billion. Inventory spans billboards, transit, malls, gas stations, and place-based networks, transacted through DSPs, direct deals, or the IAB OpenRTB DOOH extension.
DOOH vs traditional OOH
Both buy attention in the physical world. The mechanics underneath split sharply.
| Attribute | Traditional OOH | DOOH |
|---|---|---|
| Format | Printed vinyl, paper, painted | Digital LED, LCD |
| Creative swap | Manual install, days to weeks | Software, seconds |
| Buying unit | 4-week flight | Play (10 to 15 seconds) |
| Pricing | Flat rate per panel per period | CPM, multiplier per play |
| Targeting | Location only | Location, daypart, weather, audience triggers |
| Programmatic | No | Yes, via OpenRTB DOOH extension |
| Measurement | Geopath audience estimates | Geopath plus mobile attribution |
| Creative versioning | One per flight | Unlimited per flight, dynamic |
The shift matters. A static board commits a brand to one creative for a month. A DOOH panel can rotate four creative variants by daypart, then swap a fifth in the morning if rain is forecast. Buyers treat DOOH less like outdoor and more like a paid media channel that happens to render on a screen the size of a building.
Where DOOH inventory lives
DOOH inventory splits into five environments. Each has its own audience, creative spec, and pricing logic.
| Environment | Examples | Typical CPM | Best fit |
|---|---|---|---|
| Roadside billboards | Highway LEDs, urban spectaculars | $5 to $20 | Reach, brand launches, market saturation |
| Transit | Bus shelters, subway platforms, airport gates | $8 to $25 | Commuter dwell time, premium urban audiences |
| Place-based retail | Mall directories, grocery aisles, convenience checkout | $10 to $30 | Path-to-purchase moments, CPG, QSR |
| Gas station and fueling | Pump-top screens, c-store networks | $12 to $35 | Captive 3 to 5 minute dwell, high frequency |
| Office and residential | Elevator panels, building lobbies, gyms | $15 to $40 | White-collar audiences, B2B, premium consumer |
The trio of GSTV (gas pumps), Captivate (elevators), and ReachTV (airports) cover roughly half of the US place-based DOOH market by impression volume. Roadside still leads on absolute reach. Place-based wins on attention quality because the viewer is captive and the screen sits within arm's reach.
A DOOH plan rarely picks one environment. The smarter buys layer two or three, using roadside for top-of-funnel reach and place-based for proximity to the purchase decision.
Programmatic DOOH (pDOOH) and how it works
Programmatic DOOH (pDOOH) is the slice of DOOH bought through real-time auctions instead of direct insertion orders. Per Vistar Media's 2024 pDOOH industry report, pDOOH transacted roughly $3.2 billion globally in 2024, up 28 percent year over year, with the US accounting for the largest single share.
The mechanics differ from display in one important way. There is no individual user. The bid is on a screen, a daypart, and an estimated audience exposed during the play.
The flow:
- A play opportunity opens. The screen's CMS signals it has an open slot in 30 seconds.
- The supply-side platform broadcasts a bid request. The request carries screen ID, location, daypart, surrounding audience, and the impression multiplier for that moment.
- DSPs receive the request and bid. The buyer's targeting filters check the request against geo, audience, weather, time, and contextual triggers.
- The auction clears. The winning creative ships to the panel and renders during the next play.
- The play is logged. Impression count equals the multiplier for that play. Reporting flows back through the DSP.
The end-to-end loop runs in milliseconds. The same DSP a brand uses for connected TV often handles its DOOH buying through a separate inventory tab. The Trade Desk, Yahoo DSP, Vistar Media, and Hivestack are the four main pDOOH-capable DSPs in 2026.
Buying DOOH
Three paths cover most DOOH spend. They map to control, scale, and budget.
Programmatic via DSPs
The default path for any buyer running multi-market or multi-screen-network campaigns. A demand-side platform (DSP) connects to dozens of supply networks and lets the buyer set targeting, frequency caps, dayparting, and bid logic in one place.
Best fit: brands running national or multi-city DOOH alongside other digital channels. Minimums start around $1,000 to $5,000 per campaign on self-serve DSPs.
Direct deals with screen networks
The legacy path. Buyer signs an IO with Clear Channel Outdoor, Lamar, Outfront, or a place-based network like GSTV. Negotiated rate, fixed flight dates, hand-built reporting.
Best fit: brands targeting iconic panels (Times Square, Sunset Strip), national upfronts, or sponsorship-style takeovers. Minimums commonly $25,000 to $250,000.
OpenRTB DOOH extension
The technical layer underneath programmatic. Per the IAB Tech Lab OpenRTB 2.6 specification, the DOOH extension adds fields to the standard bid request to handle multi-viewer screens, including dooh.venuetypetax, screen ID, and the impression multiplier. Every pDOOH transaction in 2026 rides on top of this spec or its supply-side equivalent.
Most buyers never touch the OpenRTB layer directly. The DSP handles it. The spec matters because it is what made DOOH inventory portable across DSPs and what brought the pricing parity DOOH now enjoys with display and CTV in unified plans.
Measurement: impression multiplier and mobile-DOOH attribution
DOOH measurement runs on two layers. The first counts who saw the screen. The second proves what they did next.
The audience layer uses an impression multiplier per play. A single render to a Times Square panel does not count as one impression. It counts as the estimated number of people in the screen's viewing zone during that play, often 800 to 2,500. Per Geopath's 2024 audience methodology, the multiplier draws from cell-tower data, traffic counts, dwell time studies, and panel-based travel diaries. The multiplier shifts by daypart, day of week, and weather.
The conversion layer uses mobile-DOOH attribution. The flow:
- A device ID enters the screen's geofence during a play window.
- The device ID is hashed and added to an exposed audience cohort.
- Later web visits, app installs, or store visits from that device link back to the exposure.
- A control cohort of unexposed devices in similar geos sets the lift baseline.
Per the OAAA and Comscore Benchmarketing 2023 cross-channel study, DOOH exposure lifts mobile search activity by 46 percent and online engagement by 38 percent on average across the brands measured. The lift is incremental to other channels, not duplicative, which is why DOOH increasingly shows up in performance plans rather than brand-only budgets.
Two pitfalls trip up first-time DOOH measurement:
- Last-click attribution undercounts the channel. The conversion happens hours or days later on a phone or laptop. Last-click rarely catches it. Geo-holdout tests and incrementality studies are the honest read.
- Frequency drift. Without a frequency cap across screens, a commuter can hit the same creative 20 times in a day. The DSP's cross-screen frequency cap is the only fix.
Real-world example with numbers
A regional QSR chain runs a 30-day DOOH flight to drive lunchtime traffic across 24 stores in three metros.
The setup:
- DSP. Vistar Media.
- Inventory. Roadside LEDs within 2 miles of each store, gas station pump-tops, urban transit shelters.
- Geofence. 2-mile radius around each store.
- Daypart. 10 a.m. to 1 p.m. weekdays, 11 a.m. to 2 p.m. weekends.
- Creative. Three 10-second cuts. Two product-led, one offer-led.
- Frequency cap. 4 plays per device per day across all screens.
- Mobile attribution partner. Foursquare for store-visit lift.
Results after 30 days:
- Spend: $84,500.
- Plays delivered: 38,200.
- Impressions (multiplier-weighted): 11.4 million.
- Blended CPM: $7.41.
- Devices exposed in geofence: 612,000.
- Incremental store visits versus control geos: 9,840.
- Cost per incremental visit: $8.59.
- Same-day mobile search lift on branded queries: 31 percent.
The blended CPM came in at the low end of roadside DOOH benchmarks because place-based and transit screens rotated in at lower clearing prices during off-peak slots. The incremental store-visit number, not the impression total, was what got the campaign renewed for the following quarter at double the budget.
[INTERNAL-LINK: geo-targeting → /glossary/geo-targeting] is the single setting that made the math work. Drop the radius from 2 miles to 5 and the cost per incremental visit doubles. DOOH performance lives or dies on the geofence.
Related terms
Frequently asked questions
What is the difference between DOOH and OOH?
OOH is the broad category of out-of-home advertising, including static billboards, posters, and transit wraps. DOOH is the digital subset, screens connected to a content management system that can swap creative on demand. Per the OAAA, DOOH revenue accounted for 35.5 percent of total US OOH spend in 2024, up from 31 percent in 2022.
How much does DOOH advertising cost in 2026?
CPMs typically run $5 to $15 for roadside and transit inventory and $20 to $50 for premium urban panels in markets like Times Square, per Vistar Media's 2024 pDOOH benchmark report. Programmatic minimums start at $1,000 to $5,000 per campaign through DSPs. Direct deals on iconic boards often require $25,000 or more per flight.
Can DOOH be bought programmatically?
Yes. Programmatic DOOH (pDOOH) trades through DSPs like The Trade Desk, Yahoo DSP, and Vistar Media. Inventory clears via the IAB Tech Lab's OpenRTB DOOH extension, which adapts the standard ad request schema to screens that play to crowds rather than individuals. Most major US screen networks now sell at least part of their inventory programmatically.
How are DOOH impressions measured?
DOOH uses an impression multiplier per play. A single ad render to a Times Square panel might count as 1,200 impressions, the estimated audience exposed during that play. Geopath, Nielsen, and panel-based audience data feed the multiplier. Mobile-DOOH attribution then matches device IDs in the screen's geofence to later web visits or app installs.
Does DOOH work for performance brands?
Yes, when paired with mobile attribution. A geo-fenced DOOH flight exposes phones in the screen's catchment, then DSPs match those devices against later conversions. Per the OAAA and Comscore Benchmarketing 2023 study, DOOH lifts mobile search activity by an average of 46 percent across exposed audiences. The channel earns a place in performance plans, not just brand budgets.