Arc, the design-forward browser that built a devoted following without ever breaking into the mainstream, now has an end date. The Browser Company announced on Thursday that it will sunset Arc on December 22, 2026, and move its users to Dia, the AI-first browser it has been building since last year. TechCrunch reported the shutdown the same day.
The company’s reason is security economics. “Keeping a browser secure takes constant, dedicated work that is only increasing in the age of AI,” the company wrote. “Dia was built from the ground up to meet today’s security standards, so that’s where our engineering and security teams will focus moving forward.”
The Shutdown Runs In Three Stages To December 22
The wind-down is staged. As of Thursday, new Arc accounts can no longer be created, though existing users can keep browsing. On November 23, Arc Search on iOS and Android loses its AI features, including Browse for Me, and users will no longer be able to sign in or sync tabs — the mobile app continues as a basic local browser. On December 22, Arc stops working entirely on Mac and Windows, accounts are deactivated, Arc Search is removed from the Google Play Store, and personal data is deleted within 30 days of the shutdown.
That timetable gives Arc’s remaining users exactly two months to move. The company has published guidance on switching, and the migration is designed to be painless on paper: passwords, bookmarks, extensions and history transfer to Dia, and the features Arc users live in have equivalents — Spaces become Profiles, Folders become Pinned Tab Groups, and the signature vertical tabs survive as an optional sidebar layout.
Dia Carries The Features, With AI Optional
The Browser Company says Dia now surpasses Arc on the benchmarks it cites for speed, stability and security, and that the browser features Arc users rely on are free in Dia. For users wary of the pivot, it stresses that Dia’s AI is optional: the assistant that can question pages, summarise video and emails and assemble a morning brief from a calendar and inbox can be left off. Whether Dia’s chat-centred design wins over the users who loved Arc for the opposite reason — a browser organised around their own spaces and tabs rather than an assistant — is the open question the shutdown forces. The AI browser field Dia is betting on is the same one mapped in our explainer on Perplexity’s Comet, where the browser itself becomes the agent’s home.
Reaction among Arc’s loyalists was, by TechCrunch’s account, largely disappointed, with many reviving calls for the company to open-source Arc. That door is effectively closed: CEO Josh Miller has previously explained that Arc is built on the Arc Development Kit, a proprietary internal SDK that is also the core engine powering Dia. “While we’d love to open-source Arc someday, we can’t do that meaningfully without also open-sourcing ADK,” Miller noted. “And ADK is still core to our company’s value.”
Why It Matters
Arc’s shutdown is a clean data point in the browser wars’ new economics. Maintaining a Chromium-era browser against a rising tide of AI-era security work is expensive enough that even a well-funded team with a passionate user base chose to run one browser instead of two — and chose the AI one. It also shows how the AI browser race is consolidating: OpenAI shut its Atlas browser this year in favour of ChatGPT’s in-app browsing, and the surviving challengers are increasingly features inside larger AI products, or, like the agent tooling now being built around logins and credentials, infrastructure for agents rather than destinations in themselves. For Arc users, the practical matter is simpler and more urgent: export or migrate before December 22, because after that date the company says it can no longer identify or retrieve Arc account data.
Background
The Browser Company launched Arc as a rethink of the browser around workspaces, vertical tabs and customisable “Boosts,” and it became a favourite of designers and early adopters after its 2022 debut. The company stopped active feature development on Arc in 2025 as it shifted focus to Dia, conceding at the time that Arc’s complexity — a “novelty tax,” in Josh Miller’s phrase — had limited mainstream adoption. Later in 2025 Atlassian acquired The Browser Company for $610 million, and Dia became its flagship product. Thursday’s announcement closes the long goodbye: the team that made Arc is the team behind Dia, and from December 22 it will maintain only one browser.
Source: TechCrunch; 9to5Mac
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