Dia is a Chromium-based Mac browser from The Browser Company that answers questions across your tabs and work apps such as Slack, Notion and Teams. The browser itself is free; AI chat, Morning Brief, reports and decks need a $20 or $100 monthly plan.
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The Dia browser is a desktop web browser with an AI assistant built into the browsing window, aimed at people whose working day runs through web apps such as Slack, Notion, Google Workspace and Microsoft Teams. The company describes Dia as a modern, AI-native browser that helps teams work faster, built with strong security controls and enterprise-grade management in mind.
Dia's Terms of Use name The Browser Company of New York Inc. as the company you contract with. The Browser Company is part of Atlassian, and Dia now uses Atlassian's identity system for sign-in behind a Dia-branded login screen. Under the hood, Dia is built on Chromium, the open-source engine behind Chrome and Edge, so it inherits upstream Chromium security patches.
Two facts shape most decisions: every AI feature sits behind a paid monthly plan, and Dia currently has no public Windows release.
Dia's answers, briefs and reports draw on the tools you connect. Access is also opt-in: a Dia chat session starts with no access to other tabs and no ability to take write actions until you grant it.
Skills are saved prompt shortcuts that you call with a slash command. Student-oriented examples include /cite, which formats a source in APA, MLA and Chicago styles, /fact-check, described as a one-click fact-checker, and /job-fit, which checks a résumé against a job listing. A Skill can be shared through a link, and sharing one to the Skills Gallery makes certain Skills data publicly available.
Sync brings your profiles and bookmarks to a second Mac:
The recovery kit matters: if you lose both your machine and the recovery file, there is no way to recover the synced data.
Several of these depend on the Better Days plan.
The Morning Brief lays out your calendar, inbox and key links before the workday begins.
Each call is set up to start with the right meeting page, agenda, notes and related docs already open, plus a gentle countdown so you join on time.
Asking Dia for a deck turns scattered context into slides with headers, layout and flow that can be presented without a redesign.
For developers, Dia is pitched as a coding partner that helps you debug, review and get unstuck with feedback inside the browser.
Good fit
Less suitable
For now Dia is an AI browser for Mac, and the homepage download button reads "Available for macOS · Windows coming soon". Dia runs on Apple macOS 14+ with M1 chips or later.
Windows status differs between pages:
The download, Windows and student pages list no iPhone, iPad or Android app.
Dia releases every Thursday with the latest stable Chromium version that Google has shipped, and when Google patches a critical vulnerability, Dia ships that fix to production within 48 hours. The latest Mac release in the changelog, version 1.51.0, is dated October 1, 2026. That release upgraded the browser engine to Chromium M155.
Dia browser pricing has three self-serve tiers, each priced monthly; no annual price is shown.
| Plan | Monthly price | AI access | Also includes |
|---|---|---|---|
| Better Browser | Free | No AI features | Profiles and tab groups, split view and picture-in-picture video, built-in ad and tracking blocker, cross-device sync |
| Better Answers | $20/month | Ask Dia on any page, chat with context from all your tools, models that won't store your data | Everything in Better Browser |
| Better Days | $100/month | 6x the usage of Better Answers | Daily Morning Brief, reports, decks and recaps, prep and follow-up for every meeting; usage limits apply |
Usage on both paid plans is measured in Tasks, Dia's unit of effort: a simple request can use a fraction of a Task, while requests involving more tools, context or longer outputs use more. The monthly allowance resets at the start of each billing cycle and does not carry over; extra usage can be added in $20 credits, either as a one-time top-up or automatically through auto-reload. Auto-reload adds another block when you run low and charges you automatically for each extra credit block. Purchased credit blocks roll over until used, for up to three months from the date of purchase.
If you run out before the cycle resets, Dia does not bill an overage; AI features simply pause until the next billing date unless you add credits.
Paid plans began rolling out to most new Mac users on August 17. Existing users keep what they have for free for now and get at least 30 days' email notice before paid plans apply to their accounts. For enterprise AI security and privacy features, Dia asks companies to get in touch rather than listing a price.
Arc's own homepage introduces Dia as the next evolution of Arc. The Dia vs Arc choice largely comes down to platform support versus maintenance. Arc downloads are offered for both Windows and Mac, which matters while Dia remains Mac-only. However, Arc receives Chromium updates only, and its homepage directs users who want active security patches and enterprise-grade protection to Dia.
Gemini in Chrome adds an AI assistant to Google's browser rather than replacing the browser. It requires a Chromebook Plus, Mac or Windows computer running the latest version of Chrome, so it covers the Windows users Dia does not yet serve. On a computer, you can share up to 10 open tabs with Gemini. Google notes that Gemini in Chrome is not available to all users yet and is being released gradually.
By default, conversations, history, bookmarks and files are encrypted and stored locally on your device. When you make a request, the data needed to fulfil it, such as your question and relevant page context, passes through Dia's servers to AI partners that are contractually restricted from retaining it or using it to train their own models. The listed models and providers are GPT through OpenAI on Azure, Claude through Anthropic, Vertex and AWS, and Gemini through Vertex. Proactive features such as the Morning Brief also send page content you have viewed to a third-party model when they build a summary.
The browser is free on the Better Browser plan, but that plan has no AI features. AI chat needs Better Answers at $20 per month, and Morning Brief, reports and decks need Better Days at $100 per month.
Not as a public release yet: the Windows page promises a release this fall and offers a waitlist. On a Mac, Dia needs macOS 14 or later and an M1 chip or newer.
Dia is made by The Browser Company, which is part of Atlassian, and Dia uses Atlassian's identity system for sign-in. Arc's homepage presents Dia as the next evolution of Arc.
Dia's AI partners are contractually restricted from training their own models on your data. By default, Dia itself uses some content data to improve Dia and its small on-device models, and both can be switched off in settings.
