More than 3.1 million homes had over-the-top skinny bundles as of April, according to new data from comScore.

At that point, Hulu’s live service and YouTube TV had not yet launched. Sling TV, the first skinny bundle to launch, was the biggest with more than 2 million subscribers, comScore said, followed by Sony’s PlayStation Vue and DirecTV Now, which became available at the end of 2016.

comScore found that skinny bundle customers were highly engaged with the services, watching for 5.3 hours on the average viewing day.

In those households, the programming available via the skinny bundle accounted for more than half of the OTT viewing time.

But there was still significant viewing of other OTT services in skinny bundle homes, including Netflix at 17%, Hulu at 9%, YouTube at 7.1% and Amazon at 3.2%.

In 91% of the homes, the skinny bundle was being streamed via either a streaming stick or box.

comScore gathered viewers on streaming content consumption using its comScore Total Home Panel, which is comprised of about 12,500 homes and 150,000 digital devices and measured 52 OTT services.

Overall, OTT viewing is going on in 51 million homes or about half of those with a WiFi connection. OTT viewing accounts for 1 hour and 40 minutes a day of viewing.

About 1/3 of OTT households are cordless, while 52% are streaming only.

comScore found that consumers identified as cord cutters watched bout 81 hours of programming per month, while cord nevers—more likely to be millennials with lower incomes and first jobs—watched 61 hours per month.

In those OTT homes, 10.1 million were watching programming via network TV apps, accounting for about 14% of OTT viewing. That compares to 29% of the viewing going to Netflix, 16% to Hulu, 14% to YouTube and 7% to Amazon.