The Browser Company, known for its design-centric Arc browser, has announced it will discontinue Arc on December 22, 2026, in order to focus exclusively on its AI-first browser, Dia. The company cited escalating security demands in the AI era as a driving factor for the transition, noting that Dia was built to meet modern security standards from the outset. Starting immediately, new Arc users cannot create accounts, and by November 23, Arc Search on mobile platforms will lose AI capabilities and sign-in features, with a full shutdown of Arc on Mac and Windows scheduled for late December. User data will be deleted within 30 days after the shutdown.

Dia is said to provide improvements over Arc in speed, stability, and security, carrying over several core features such as vertical tabs, profiles (formerly Spaces), and tab group management, now called Pinned Tab Groups. User data including passwords, bookmarks, extensions, and history will transfer seamlessly to Dia. Despite this, many Arc fans expressed disappointment on social media, renewing calls for the browser to be made open source. However, CEO Josh Miller explained that Arc is built on a proprietary internal SDK called the Arc Development Kit (ADK), which is essential intellectual property also powering Dia, making open-sourcing difficult.

The phase-out of Arc follows a strategic pivot that began in 2025 when The Browser Company paused active feature development on Arc to prioritize Dia, reflecting the company’s shift toward AI-centric products. This change coincided with the company’s acquisition by Atlassian for $610 million, with leadership conceding that while Arc was beloved by enthusiasts for its novel interface, it struggled to break into the mainstream market dominated by browsers like Chrome. The Browser Company aims to build on Dia as their flagship product to meet evolving user and security needs in the browser space.

With Dia, The Browser Company intends to maintain a free user experience and offer AI features as optional enhancements. The sunset of Arc marks the end of a bold but ultimately niche experiment in reimagining the web browser. The move to concentrate engineering and security efforts on Dia underscores the growing challenges browsers face in balancing innovation, user experience, and security amid rapid advancements in AI technology. Users transitioning from Arc to Dia can expect a familiar, though more secure and AI-equipped browsing environment moving forward.