CBS All Access rocketed to new heights with the premiere of “Star Trek: Discovery,” but it remains to be seen if the lift will be a lasting one.

On Sunday, Sept. 24, when the first episode in the new “Star Trek” franchise debuted, downloads of the CBS mobile app shot up 64% compared with the two previous Sundays, according to app-analytics firm Sensor Tower.

First-time installs of CBS’s full-episode and live TV app from Apple’s App Store and Google Play topped 46,000 on Sunday, versus about 28,000 for Sept. 10 and 17, Sensor Tower estimated.

That said, “Star Trek: Discovery” was no match for Westeros: HBO Now app had 171,000 new installs for the of “Game of Thrones” season 7 premiere July 16, according to Sensor Tower. Note, however, that the research firm’s estimates don’t include usage on connected-TV platforms and the web.

CBS doesn’t disclose subscriber figures for All Access, but it said “Star Trek: Discovery” set a record for subscriber signups in a single day, beating the previous one-day record for the 2017 Grammy Awards in February. In addition, the company said All Access had its biggest week — and month — ever for signups, crediting not only “Star Trek: Discovery” but also the kickoff of the NFL season and the season finale of “Big Brother” and the show’s 24-hour live feeds (available only on All Access).

CBS All Access costs $5.99 per month, after a one-week free trial, or $9.99 monthly without ads. At this point, it’s not clear from Sensor Tower’s initial estimates how many of the users who installed the CBS mobile app may convert into paying customers.

The first two episodes of “Star Trek: Discovery” are currently available to stream on CBS All Access, with new episodes available on-demand weekly after 8:30 p.m. ET on Sundays. Outside the U.S., Netflix has a deal with CBS to stream the series.

CBS chief Leslie Moonves last month said that together, All Access and Showtime standalone over-the-top services are expected to top 4 million subs by the end of the year — with the company targeting 8 million by 2020. Analysts believe Showtime has the larger share of that total, suggesting CBS All Access to account for around 1.5 million subs.