Roku ’s low-cost streaming service, Howdy , has hit more than one million subscribers, according to research firm Antenna. After launching in August 2025, Antenna estimates that the $2.99 a month service added close to 300,000 subscribers in its first month, with an additional 100,000 or more added each subsequent month. The streaming research firm also estimates that 51 percent of subscribers that signed up for Howdy in August and September are still subscribed, giving it a higher retention rate than many other streaming platforms.  Roku itself has not released subscriber numbers for the streaming platform, but a spokesperson said the company has been “encouraged by the momentum.”  “We’re pleased with Howdy’s strong early performance.…