Nielsen Launches Co-Viewing Pilot With Wearables as Tubi Deal Signals Streaming Measurement Arms Race

Nielsen kicked off one of its most significant methodological changes in years when it launched a co-viewing pilot program on Super Bowl Sunday, February 8, 2026. The pilot uses proprietary wearable devices — resembling smartwatches and worn on panelists' wrists — to passively capture audio from TV events and identify who in a household is actually watching. If it works as planned, the methodology will be folded into currency measurement by the 2026/2027 broadcast season.

How the Wearables Work

Traditional TV measurement has always struggled with co-viewing — the gap between the number of TVs tuned in and the number of people actually watching. Nielsen's existing panel methodology requires formal log-in processes that miss casual co-viewers: the roommate on the couch, the kid watching over a parent's shoulder, the guests at a Super Bowl party.

The new wearable devices solve this by capturing audio passively, matching it to programming without requiring any active input from panelists. Nielsen CEO Karthik Rao framed the initiative as essential for live events: "Our clients produce live TV events that get the world watching. It's our job to make sure we are accurately counting the audiences."

The pilot will continue through high-profile sports and entertainment events in the first half of 2026. Initial co-viewing estimates will be released separately from Big Data + Panel ratings — they won't be considered "currency" yet — with full integration targeted for the 2026/2027 season.

Why This Matters for CTV

The co-viewing gap affects streaming and linear TV differently, but it matters for both. For ad-supported streaming, undercounting co-viewers means undercounting ad impressions delivered — which directly impacts CPM calculations and the perceived value of streaming inventory. For live events on linear, it means the biggest audience moments in television may be systematically undermeasured.

As Variety reported, accurately counting live event audiences could meaningfully boost ratings for sports, news, and specials — programming categories where co-viewing is highest.

Tubi's Expanded Nielsen Deal

Days before the Super Bowl pilot, Tubi announced a major expansion of its own Nielsen partnership. The Fox-owned free streamer added Nielsen's Audience Measurement, Streaming Platform Ratings, National TV research, and Ad Intel services to its existing Digital Ad Ratings and Nielsen ONE Ads integrations.

The numbers behind the deal tell an important story. According to Nielsen data revealed in the announcement, Tubi now commands 6.2% of total ad-supported streaming — positioning it ahead of Netflix, Peacock, Pluto TV, and Paramount+ in ad-supported viewing. Its audience has grown 973% among adults 18-49 over the past five years, and it outperforms all major broadcast and cable networks in ad-supported minutes watched in that demo.

The Measurement Arms Race

These moves signal a broader pattern: as streaming captures a larger share of total TV — 47.5% of all viewing in December 2025, a new record — the fight over how to measure it is intensifying. Platforms want credit for every viewer they deliver. Advertisers want deduplicated reach and transparent frequency data. And Nielsen is trying to modernize its methodology fast enough to remain the industry's primary measurement backbone.

What to Watch

Two things will determine whether the co-viewing pilot reshapes the market. First, how large is the actual co-viewing adjustment? If the wearable data shows that live events are being undercounted by 10-20%, that's a material change in the economics of live TV advertising. Second, will the industry accept the new methodology as currency? The transition from panels to Big Data + Panel was contentious enough. Adding a wearable-derived co-viewing layer introduces another variable for buyers and sellers to debate.

For measurement teams, the immediate action is straightforward: watch the pilot results when Nielsen releases them later this year, and prepare for the possibility that audience estimates for your CTV and live TV campaigns may shift meaningfully once co-viewing adjustments are incorporated.