Pour one out for the sidebar. The Arc browser shutdown is official: The Browser Company announced on October 22 that Arc, the browser that convinced a few hundred thousand design nerds (me included, for about six months) that tabs belonged on the left, is being switched off for good. Not “maintenance mode”. Off.
And the suggested replacement is, you guessed it, the AI browser they built instead of fixing Arc.
Arc browser shutdown: the dates that matter
The timeline is short and brutal. New Arc accounts are already closed. On November 23, Arc dies on iOS and Android, sync sign-in goes away, and several of the AI features get pulled. On December 22, the desktop apps on macOS and Windows stop working entirely. Accounts are deactivated and your data is wiped within 30 days after that.
So if you’ve got three years of Spaces, pinned tabs and Easels in there, you have roughly two months. Export now, cry later.
CEO Josh Miller says the team has “so much pride and love for what we made alongside the Arc community.” I believe him. I also remember May 2025, when the company announced it was pivoting to Dia and quietly parking Arc, followed by Atlassian buying the whole outfit later that year. From that moment, Arc’s fate was a matter of when, not if.
Why they won’t just open-source it
This is the part that stings. Arc is Chromium-based, so the obvious ask was: hand the code to the community and let people keep it alive. Miller shot that down back in 2025, explaining that Arc “runs on custom infrastructure we call ADK”, the Arc Development Kit, and that Dia depends on the same plumbing. Open-sourcing Arc would mean open-sourcing the guts of their new product. So, no.
I get the business logic. I also think it’s a lousy outcome. A browser that people genuinely loved, with ideas Chrome and Edge later borrowed (vertical tabs, anyone?), gets erased because it shares a few libraries with a chatbot wrapper. If you ever needed a reminder that a closed-source browser is a loan and not a purchase, here it is.
Where Arc users should go now
The official pitch is Dia, the “AI-native” browser, which can import your Arc profile. Fair enough if you want an assistant reading every page you open. Personally, Dia solves a problem I don’t have and creates several I do.
A lot of the Arc diaspora already landed on Zen, a Firefox-based browser that cloned the sidebar-and-workspaces layout and is open source, so this exact story can’t happen to it. Vivaldi remains the power-user choice with more settings than you’ll ever touch. There’s also Strawberry, an agent-driven browser still in beta, if you enjoy living on the bleeding edge.
What I’d do: install Zen this weekend, import bookmarks straight from Arc (it works), rebuild your workspaces over a coffee, and be done before the November 23 mobile cutoff forces your hand. Treat the Dia import as a trap unless you were already sold on the AI thing.
Turns out the most innovative browser of the decade had a feature nobody asked for: a self-destruct timer.
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