Dia alternatives.

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, Split View, AI chat about pages, Chrome extensions, an ad blocker, a Windows version and a free price.

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.

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, Split View, AI chat about pages, Chrome extensions, a Windows version and a free price. Misses: an ad blocker.

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.

Tabbit is a free Chromium AI browser for Mac and Windows from Lumina Lab in Singapore, with chat, an agent mode and a choice of many vendors’ models.

Keeps: tabs down the side, folders in the sidebar, Split View, AI chat about pages, Chrome extensions, an ad blocker, a Windows version and a free price. Misses: spaces.

Pick it if you want a free agent browser with a wide choice of models, Chinese ones included. The catch: Top models and heavy agent use need Pro at $30 a month.

Comet is Perplexity’s free Chromium browser for Mac, Windows, iPhone and Android, with Perplexity’s search and an assistant that can act on pages for you.

Keeps: folders in the sidebar, Split View, AI chat about pages, Chrome extensions, an ad blocker, a Windows version and a free price. Misses: tabs down the side and spaces.

Pick it if you use Perplexity and want its search and agent in the browser. The catch: Free use of the assistant is limited; more agent use is Pro at $20 or Max at $200.

BrowserOS is an open-source Chromium agent browser for Mac, Windows and Linux. Its agent runs on the AI you connect: an API key, a ChatGPT or Copilot plan, Claude Code or Codex, or a local model.

Keeps: tabs down the side, folders in the sidebar, Split View, AI chat about pages, Chrome extensions, a Windows version and a free price. Misses: spaces and an ad blocker.

Pick it if you want an open-source agent browser on your own AI keys or local models. The catch: No built-in model since version 0.51: connect a provider before the agent works.

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, Split View, AI chat about pages, Chrome extensions, an ad blocker, a Windows version 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.

Opera Neon is Opera’s agent browser for Mac and Windows. Its own agents act in your live session on a $19.90 plan, and since August 2026 outside agents like Claude Code can use it free through its MCP Connector.

Keeps: spaces, AI chat about pages, an ad blocker, a Windows version and a free price. Misses: tabs down the side, folders in the sidebar, Split View and Chrome extensions.

Pick it if you want Claude Code or another MCP client to use a real signed-in browser, free. The catch: Opera’s own agents need the $19.90 a month plan.