Arc has 61 days left. The Browser Company plans to shut the browser down on Dec. 22, when the Mac and Windows apps stop working and every Arc account is deactivated, and it is pointing people to Dia, its newer AI browser.

Security is the reason the company gave. “Keeping a browser secure takes constant, dedicated work that is only increasing in the age of AI,” it wrote on a farewell page at arc.net , adding that its engineering and security teams will focus on Dia from here. The Arc help center was blunter, saying “we can no longer keep Arc as safe and secure as it needs to be.”

Mobile goes first, then the desktop apps

Nobody can open a new Arc account as of Thursday. Existing members on Mac and Windows keep getting basic fixes until the cutoff. Arc Search on iOS and Android loses Browse for Me and its other AI features on Nov. 23, along with sign-in and tab sync. On Dec.…