Arc Browser Dies December 22 as Browser Company Bets on Dia

The Browser Company will kill its Arc browser on December 22, 2026, ending a product that was once its flagship and redirecting all engineering firepower to Dia, its AI-first successor. The shutdown timeline began Thursday, when the company stopped allowing new Arc accounts.

The decision came down to money and security. Maintaining a browser's defenses now demands more resources than ever, the company said.

"Keeping a browser secure takes constant, dedicated work that is only increasing in the age of AI," The Browser Company wrote in its announcement. "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."

What happens and when?

The wind-down runs in three stages, and each one removes functionality from a product that still has paying attention from a devoted user base.

• Now: New Arc accounts can no longer be created.
• November 23: Arc Search on iOS and Android loses its AI features, including "Browse for Me." Users can no longer sign in or sync tabs, though the app keeps working as a basic local browser.
• December 22: Arc stops working entirely on Mac and Windows. Accounts are deactivated, personal data is deleted within 30 days, and Arc Search is pulled from the Google Play Store.

Why won't Arc go open source?

User reaction on social media skewed disappointed, and many commenters revived a familiar demand: make Arc open source. CEO Josh Miller has already explained why that won't happen.

Arc runs on the Arc Development Kit, or ADK—a proprietary internal SDK that also serves as the core engine powering Dia. Handing Arc's code to the public would mean handing over Dia's intellectual property too.

"While we'd love to open-source Arc someday, we can't do that meaningfully without also open-sourcing ADK," Miller previously noted. "And ADK is still core to our company's value."

What survives in Dia?

Migrating users won't lose everything. Dia carries over equivalents of several core Arc features, and the company claims its new browser now beats Arc on speed, stability, and security benchmarks.

• Profiles (formerly Arc's Spaces) let users swipe between work and personal environments.
• Arc's signature vertical tabs remain available as an optional sidebar layout.
• Folders return rebranded as "Pinned Tab Groups."
• Passwords, bookmarks, extensions, and history transfer automatically to Dia.

Arc features stay free in Dia, with AI capability offered as an option rather than a requirement.

How did Arc end up here?

The December date formally closes a chapter that started winding down in 2025, when the startup halted active feature development on Arc. At the time, the company conceded that while early adopters loved the browser's novel interface, the "novelty tax" and its complexity limited mainstream adoption.

Arc earned fierce loyalty from a dedicated group of enthusiasts. It never became the mass-market Chrome alternative its makers envisioned.

The corporate backdrop shifted too. Atlassian acquired The Browser Company in 2025 for $610 million, and the Dia-first strategy now defines what that purchase bought.

For the enthusiasts still holding out, the math is unforgiving: 30 days after December 22, their data is gone, and the code they want preserved stays locked inside a $610 million acquisition's most valuable asset.