When Atlassian closed its purchase of The Browser Company on October 21, 2025, we half expected Dia to turn into a work tool, something that would file the Jira ticket for you. Almost a year later, with version 1.49.0 out on September 16, 2026, it’s still mostly a browser you talk to: chat and skills across your open tabs, not page automation.
It also still needs an Apple Silicon Mac on macOS 14 or later. Windows is in beta and due “this fall”, and for a lot of people searching for a Dia alternative that’s the whole story, so if you’re on a Windows PC, the rest of this is background reading.
What you’d use each one for
Chatting with your tabs is a nice way to read, especially with ten tabs open on one question and no patience left for any of them. We go back and forth on how much people want beyond that from a browser. The people who leave Dia often say they wanted it to do things for them, and we built dassi on the bet that they’re right, but we don’t think that argument is settled, and a lot of browsing really is just reading. Dia is free with capped AI and Dia Pro is $20 a month, and whether Pro is worth $20 is the other thing former users tend to bring up.
Invoices at eleven at night
Take a month-end routine: copy invoice totals out of three supplier portals, paste them into your expense tool, submit the claim. Dia could help you read those invoices once they’re open in tabs. Getting the numbers across is still your evening.
dassi is meant for that part. You describe the routine in plain English, or do it once while dassi follows along, and it’s saved as a workflow you can run whenever you like or put on a schedule (in your own browser, which has to be open when a run is due, so if you pictured the claim going in on the first Saturday of the month while you’re at the park, leave the laptop awake). Anything it can’t decide gets turned into a question for you, and submitting the claim can be a flagged action that waits for your OK. You choose the model, a local one included, and pay $10 a month with your own key or $25 to $300 a month on a plan with credits.
Logging in
Because dassi works in the Chrome, Edge or Brave you already use, those three portals are probably signed in already, whereas Dia, being its own browser, needs you signed in to each site inside Dia first. When a session has lapsed, dassi signs in with whatever Chrome’s password manager autofills, which keeps the password in your password manager instead of pasted into a chat or into dassi’s settings. 2FA codes go to your phone, and dassi waits for you to enter them.
When to choose Dia
If you have an Apple Silicon Mac, you wanted a new browser anyway, and what you mostly want from AI is help reading, we’d try Dia first. The free tier is enough to find out whether Pro earns its $20.
When to choose dassi
When the invoices are the problem rather than the reading, or when a Mac-only browser won’t work for you or your team. The agent runs locally, and the instructions and page content it needs go to your chosen AI provider, through dassi’s relay if you use included credits.
Whether Dia on Windows will do anything on pages when it leaves beta, we have no idea, and as far as we know The Browser Company hasn’t said.