Orion alternatives.

Arc is The Browser Company’s Chromium browser for Mac and Windows that put tabs down the side, with spaces, folders and Split View. It has had no new features since May 2025; it still gets security fixes, and its makers point people to Dia.

Keeps: tabs down the side, spaces, folders in the sidebar, AI chat about pages, Chrome extensions and a free price. Misses: an ad blocker and a phone app that syncs.

Pick it if you use it today and want its sidebar, spaces and Split View exactly as they are. The catch: No new features since May 2025, only security updates.

Vivaldi is a Chromium browser with a setting for nearly everything, mail, calendar and feeds built in, a free Proton VPN and no AI by design, on every desktop and phone.

Keeps: tabs down the side (as a setting), spaces, folders in the sidebar, Chrome extensions, an ad blocker, a phone app that syncs and a free price. Misses: AI chat about pages.

Pick it if you want mail, calendar, feeds, notes and a VPN in the browser. The catch: No AI assistant or agent, by design.

Zen is a free, open-source browser built on Firefox that brings Arc’s layout, tabs down the side with spaces, folders and Split View, to Mac, Windows and Linux.

Keeps: tabs down the side, spaces, folders in the sidebar and a free price. Misses: AI chat about pages, Chrome extensions, an ad blocker and a phone app that syncs.

Pick it if you want Arc’s layout, free and open source. The catch: Releases are still labeled beta.

Aside is an AI agent browser from a Y Combinator startup, on Chromium, for Mac and Windows. Its agent does multi-step work in the sites you are signed in to, on Aside’s own models or your ChatGPT or Claude plan.

Keeps: tabs down the side, spaces, folders in the sidebar, AI chat about pages, Chrome extensions, an ad blocker and a free price. Misses: a phone app that syncs.

Pick it if you want an agent for multi-step work across your signed-in sites, on Mac or Windows. The catch: The free plan has 500 AI credits a month; more is Pro at $20 or Max at $200.

SigmaOS is a Mac browser on WebKit that treats tabs like a to-do list, in workspaces down the side, with an AI assistant called Airis.

Keeps: tabs down the side, spaces, AI chat about pages, Chrome extensions, an ad blocker and a free price. Misses: folders in the sidebar and a phone app that syncs.

Pick it if you want workspaces and tabs you mark done, on a Mac. The catch: Mac only.

Opera One is Opera’s free Chromium browser on every desktop and phone, with a free browser VPN, an ad blocker, messengers in the sidebar and Opera AI. Its agents are in a separate browser, Opera Neon.

Keeps: tabs down the side (as a setting), spaces, folders in the sidebar, AI chat about pages, Chrome extensions, an ad blocker, a phone app that syncs and a free price.

Pick it if you want a free browser VPN and an ad blocker built in. The catch: Opera AI only chats and sums up; agents need Opera Neon at $19.90 a month.

Edge is Microsoft’s Chromium browser on every desktop and phone, with Copilot built in. Since Copilot Mode was retired in May 2026, its agent, Browse with Copilot, comes with Microsoft 365 Premium in the US.

Keeps: tabs down the side (as a setting), spaces, folders in the sidebar, AI chat about pages, Chrome extensions, a phone app that syncs and a free price. Misses: an ad blocker.

Pick it if you use Microsoft 365 and want Copilot in the browser. The catch: Browse with Copilot needs Microsoft 365 Premium ($19.99 a month) and is US only.