1zero Browser 2.0

2.0 is the biggest update we've shipped. The browser now has an AI you can talk to beside any page, a place to write, and a side panel that holds both. Links from other apps stop yanking you out of what you were doing. And the tab dialog learned a few new words.

If you already use 1zero Browser, it updates on its own. Restart and you're on 2.0. If you don't, download it here.

AI chat in the side panel

The AI is off until you want it. Turn it on in Settings → AI, then press ⌘CtrlE on any page to open the chat beside it.

Ask about the page you're on. It can read the page, and if you let it, click, type and scroll for you. Ask it to find the cheapest lamp on a shop's page and put it in your cart, and it will. It asks before it does anything, and you approve each step.

We didn't want to lock you into one model. If you already have Claude Code, Codex, Gemini or Cursor installed, the chat uses them, with no new account and no new bill. If you have none of those, sign in and use 1zero AI, which needs no setup. Switch between them from the model picker, ⌘Ctrl/ while you're in the chat.

A few more things the chat does:

• Talk instead of typing with ⌘Ctrl⇧ShiftD. The speech model runs on your computer, so what you say never leaves it.
• Attach files, paste pictures, or mention another tab with @ to bring it into the conversation.
• Send a message to the Dynamic Island, the pill at the top of the window, and the conversation carries on there while the panel stays closed. Choose where messages go in Settings → AI → Send messages to.
• Share a chat as a private, read-only link.
• Right-click any message to copy, edit, retry or fork it.

An AI that remembers, and runs on time

The AI can keep facts between chats, like where you live or which airline you fly. It asks before it saves anything, every time. You can see everything it knows, and forget any of it, in Settings → AI → Memory.

You can also give it prompts to run at set times. A morning summary of the news you follow, or a check on a price you're waiting to drop. Set them up at onezero://schedules. They run in a hidden tab on your computer and report back when they're done.

And if you'd rather drive the browser from somewhere else, 2.0 has an MCP server. Claude Code, Codex, Cursor and other apps can use the same tools the side chat has, with you approving what they do. In Settings → AI → MCP server, press Connect next to an app and the browser sets it up.

Notes

Go to onezero://notes, or type notes in the tab dialog, and start writing. Notes are Markdown, but you don't have to look at the symbols: type # and a space, and the line turns into a heading as you type. Or type / for a menu of everything a note can hold: headings, lists, to-dos, quotes, code, tables, today's date, a link to one of your tabs, or Ask AI.

The AI can write with you. Ask it to draft a note, turn your rough list into something readable, or pull facts from the page you're on into a note. When you want to send one to someone, ⌘Ctrl⇧ShiftS shares it as an encrypted link.

A side panel for everything

The AI chat, the sites you pin and your extensions' panels now share one panel. Press ⌘Ctrl⌥AltS to open it, switch between them from its bar, and pick which side each one opens on in Settings → Side panel. Choose the sites it holds in Settings → Side panel → Sites.

It has a glass design that shows your actual desktop behind it. Sites you hide in the panel go to sleep, so a pinned Spotify or Discord doesn't eat memory while you're not looking at it.

A small window for links

Click a link in Slack, Discord or your mail app, and it opens in a small window over that app instead of pulling you into the browser. Read it, close it, and you're back where you were. If it turns out you want to keep it, press Open (⌘CtrlO) and it moves into a tab as it is, without loading again. It's on from the start, and Settings → General → Small window has a key you can turn on, ⌘Ctrl⌥AltN, that opens an empty one over any app.

You can also send a site's links straight to one of your folders instead, so everything from your work tools lands in the same place. Press ⌘Ctrl⌥AltO in a small window and pick Always open in a folder.

More from the tab dialog

The tab dialog, ⌘CtrlT, does more than find tabs now. Type history, downloads, chat, notes or closed and the cards turn into a list, with details for whatever you pick shown beside it.

Some smaller additions:

• Pick a layout for its cards in Settings → Tab dialog.
• Search finds folders by name.
• Undo and redo moving tabs with ⌘CtrlZ and ⌘CtrlY.
• Type speed test to measure your connection.
• Type define and a word to get its meaning.

New plugin: YouTube

The YouTube plugin puts your own YouTube feed on the home page, and shows video results in the search box when you type YouTube. Install it from the plugin marketplace at onezero://plugins.

Everything else

• Put any tab to sleep by hand from its card or its menu, or give Sleep tab keys of your own in Settings → Keyboard shortcuts.
• Find in page opens in the media island, and ⌘CtrlF again goes to the next match.
• Mute a tab with ⌃CtrlM. A tab playing sound shows a speaker on its pill.
• Close Tab on a pinned tab takes it back to the page it was pinned at.
• Choose which title bar buttons show, and arrange the tab dialog's bottom bar.
• Close tabs you haven't used when you come back, with Undo if you change your mind.
• Gmail codes now finds Notion's login codes.
• With Fade site title on, a loading page shows a spinner and its title.
• Extensions without an options page open their popup in a window of its own.
• Reddit Enhancement Suite and DeArrow start again.
• The browser no longer crashes when the window regains focus after a tab crashed.
• The window drags from anywhere on the title bar.

The full list is in the changelog. If something breaks, or you want something we haven't built, tell us on Discord.