TikTok will appear before the Supreme Court on Friday in a final attempt to prevent a national ban on the app. The social media site, which 170 million Americans use, is fighting the ban after U.S. courts ruled it had to be split from its Chinese owner, Bytedance, by January 19.

RedNote, which is known in China as Xiaohongshu, the Mandarin term for “little red book,” is the most downloaded free app on the Apple App Store.