These two terms get thrown around interchangeably. Even people in the industry mix them up. But they mean different things, and the distinction matters when you’re spending real money on streaming advertising. Our deep dive on connected TV vs OTT advertising covers the full buying implications.
Here’s the short version. Then we’ll get into why it matters for your ad buying.
The Two-Word Distinction
CTV is the device. OTT is the delivery.
That’s it. Everything else is context.
CTV (Connected TV) refers to a television connected to the internet. Smart TVs, Roku, Fire TV, Apple TV, gaming consoles. If it’s a TV screen that streams, it’s CTV.
OTT (Over-The-Top) refers to content delivered via the internet, bypassing traditional cable or satellite infrastructure. The name comes from going “over the top” of the cable box. OTT happens on any screen. Phone, tablet, laptop, TV.
The overlap: all CTV viewing is OTT (it’s streaming). Not all OTT is CTV (some happens on phones and laptops).
The Simple Test
Ask one question: is it on a television?
Watching Hulu on your smart TV? CTV and OTT. Watching Hulu on your phone during lunch? OTT only. Same platform. Same content. Same ad. Different device, different classification.
The device is the dividing line. Not the platform, not the content, not the subscription model.
Why Ad Buyers Care
For PI firms placing media, the CTV vs OTT distinction drives three decisions that affect performance.
CTV (Television Screen)
- Living room environment with lean-back viewing
- 90%+ ad completion rates because ads aren't skippable
- Household-level reach, often multiple viewers per impression
- Higher attention and recall than any other digital format
- CPMs run $25-65 for legal, reflecting premium placement
OTT Mobile/Desktop
- On-the-go or desk viewing, smaller screens
- Lower completion rates due to scrolling and multitasking
- Individual-level targeting via mobile ad IDs
- Lower attention but useful for sequential messaging
- CPMs run $15-35, reflecting smaller screen format
The attention gap is the big one. Someone watching your 30-second spot on a 65-inch TV in their living room is having a fundamentally different experience than someone seeing it on their phone while waiting for coffee. Both count as impressions. Only one builds the kind of recall that drives branded search.
Household vs Individual
CTV reaches households. Multiple people watch together. For PI firms, that matters. Accidents affect families. The injured person and their spouse are often making legal decisions together. A CTV impression in the living room reaches both of them.
Mobile OTT reaches individuals. One person, one phone. Different context, different value.
Targeting Differences
CTV targeting works at the household level via IP addresses and device graphs. Mobile OTT targets individuals via mobile ad IDs. Both have value, but they answer different questions.
CTV asks: which households should see this ad? Mobile OTT asks: which person should see this ad?
For brand building and awareness, household reach (CTV) is the play. For retargeting someone who already visited your site, individual targeting (mobile OTT) fills the gap.
How Most PI Firms Should Buy
The 80/20 rule applies here.
Most of your streaming budget should go to CTV. That’s the TV screen, the living room, the high-attention environment that mimics broadcast but with better targeting. It’s where your message sticks. It’s where someone remembers your name three weeks later when they actually need a lawyer.
The remaining budget goes to mobile/desktop OTT for frequency extension and retargeting. Someone saw your CTV spot at home, then sees a shorter version on their phone the next day. That sequential exposure reinforces the message.
A typical split: 80-90% CTV, 10-20% mobile/desktop OTT. Some campaigns run 100% CTV, especially at lower budgets where concentration matters more than coverage.
When the Terms Don’t Matter
Here’s the honest truth: most of the time, the CTV/OTT distinction is academic.
When you buy through a programmatic platform, you’re typically buying across devices. The platform optimizes delivery between TV screens and mobile based on performance. Your reporting shows CTV vs mobile breakdowns, but the buying happens as one campaign.
The distinction matters when you’re reviewing reports, setting device preferences, or comparing vendor proposals. If a vendor says “OTT campaign” and means mostly mobile inventory at $15 CPM, that’s a different product than a CTV campaign on television screens at $35 CPM. Same term, very different value.
Ask your vendor or agency: what percentage of impressions will be delivered to television screens specifically? That’s the number that matters. We track streaming adoption across all 210 DMAs, and in markets like Atlanta, 48% of legal ad spend now goes to streaming. The firms winning that shift are buying CTV, not just “OTT.”