Arc rebuilds the browser as an app platform — sidebar tabs and Spaces replace the tab bar

The Browser Company started with a simple observation: the people who do knowledge work on laptops live inside their web browser. Files became URLs, apps became websites, and the tab bar became the de facto desktop — but browsers were still designed as document viewers for the early web. In 2019 the company set out to rebuild the browser for what it had actually become: an application platform.

The result, Arc, kept Chromium under the hood so the entire web still works, and redesigned everything around it. Tabs moved from a row on top into a collapsible sidebar that works like an app switcher, with pinned and ephemeral tabs. Spaces split browsing into rooms — one for work, one for personal, one per project. A command bar replaced the address bar as the way to navigate and search, and split view, Little Arc and Peek handled the small tasks of daily browsing. The company shipped weekly, an unusual cadence for a browser.

The bet paid off in attention if not in scale. Arc launched to a waitlist in 2022, hit 1.0 in July 2023, and Wired reported the launch "was a hit, with positive reviews and influential users like Marques Brownlee." When the company added AI features as Arc Max in late 2023, users created over a million summaries in the first week and blew past the company's data limits so fast it had to ask OpenAI and Anthropic for more capacity. ZDNet, reviewing a year later, called Spaces the best tab management on the market and said Arc "made browsing fun again."

The idea also exposed its own limit: every new metaphor — sidebar, Spaces, Boosts — was a concept users had to learn. CEO Josh Miller later admitted on Decoder that he regretted how many new words Arc introduced. The design thesis — treat the browser as an operating system for the internet — had created a devoted minority rather than a mass market.