Arc browser sunset: Zen Mac downloads jumped 59%. Dia isn't the winner

Short answer: Arc stops working on December 22, 2026, and The Browser Company wants every Arc user to move to Dia. The users are not listening. In the week Arc announced its sunset, Zen's Mac installer downloads hit 9,149 a day, 59% above its usual 5,750 and the best rate of any Zen release since at least November 2025, while Atlassian's own 10-K shows it valued the browser tech it bought at $80M on a three-year clock.

TL;DR: Atlassian's books put the purchase price at $488.3M, and 77% of that ($376.9M) is goodwill, mostly "assembled workforce", plus $97.0M in stock for key staff. In the 252-comment Hacker News farewell thread, 23 people said what they use now: 7 picked Zen and 4 picked Dia, so 19 of 23 went somewhere other than the browser Arc is pushing. Arc will have lived 3.41 years after its public launch, shorter than 61.7% of the 308 products in the Killed by Google graveyard, so if you are on Arc, export now and pick a browser nobody can switch off.

Key numbers

What	Number	Source, checked Oct 25 2026
Arc stops working on macOS and Windows	Dec 22, 2026 (new accounts blocked Oct 22, mobile AI and sync off Nov 23)	arc.net farewell page
Atlassian purchase price for The Browser Company	$488.3M ($481.5M cash + $6.8M shares)	Atlassian 10-K FY2026, Note 7
Goodwill in that price	$376.9M (77%)	Atlassian 10-K
Stock grants to Browser Company staff	$97.0M to key employees + $8.2M replacement RSUs	Atlassian 10-K
Value Atlassian put on the browser tech	$80.0M, 3-year useful life	Atlassian 10-K
Zen Mac installer downloads per day, Arc week	9,149 vs 5,750 median (+59%)	GitHub releases API, our math
Zen Windows installer downloads per day, Arc week	7,160 vs 7,345 median (-2.5%)	GitHub releases API, our math
HN commenters naming their new browser	23: Zen 7, Dia 4, Helium 4, Brave 3	HN farewell thread, our hand count
Arc Wikipedia views, day after the news	1,921 vs 178 median (10.8x)	Wikimedia pageviews API
Dia paid plans	$20 and $100 a month (browser itself free)	diabrowser.com/plans

Arc dies on December 22, and the clock already started

The Browser Company posted "A farewell to Arc" on October 22. The shutdown comes in three steps, straight from its own timeline.

• October 22: no new Arc accounts. The latest build adds an export button and a smoother import into Dia.
• November 23: on iOS and Android, Browse for Me and the other AI features go dark, and you can no longer sign in or sync tabs.
• December 22: Arc stops working on macOS and Windows. Accounts are deactivated and personal data is deleted within 30 days. Arc Search leaves Google Play.

The stated reason is security: "Keeping a browser secure takes constant, dedicated work that is only increasing in the age of AI." Translation: the security team is moving to Dia, and Arc was never getting the next decade of patches.

This did not come out of nowhere. Arc stopped getting new features in May 2025, when the team pivoted to Dia, and Atlassian announced it was buying the company in September 2025 for a widely reported $610 million. The sunset post is just the paperwork.

Follow the money: Atlassian bought a team and an enterprise pitch, not Arc

Here is what nobody quoting the $610M headline read. Atlassian's fiscal 2026 10-K says the deal closed October 20, 2025 at a purchase price of $488.3 million. On top of that sit $97.0M of restricted stock for "certain key BCNY employees" and $8.2M of replacement awards. Add those and you get $593.5M, which is about where the headline number lives.

Now look at what the $488.3M bought:

• $376.9M goodwill (77%). Goodwill is the leftover after you price everything you can actually name. Atlassian says it is "primarily attributed to the assembled workforce and expanded market opportunities."
• $80.0M developed technology, described as "BCNY's AI-enabled browser technology," with a three-year useful life.
• $22.2M cash sitting in the company's bank account.
• $11.0M trade name, also on a three-year life.

The 10-K describes the purchase as "a browser for enterprises designed for knowledge workers using SaaS applications in the AI-era." The word Arc appears exactly once in the whole filing, inside the phrase "the Dia and Arc browsers." Rovo, Atlassian's AI product, appears 18 times. Jira, 25.

So the receipts say it out loud. Arc's fans were never the asset. The people who built it were, and the asset Atlassian booked is an AI browser it plans to sell to companies that already pay for Jira and Confluence. Arc's tab hoarders were the warm-up act.

Where Arc users are actually going: Zen, by a mile on the Mac

The Browser Company built a slick importer and made Dia's core browser free. If its users were moving to Dia, you would not see a stampede into a volunteer-run Firefox fork. We pulled every Zen release from the GitHub releases API and split the downloads by file.

Zen ships a new build every few days, and a fresh install grabs whatever build is newest, so the installer count on each release works as a meter of new installs while that release was current. We divided each release's installer downloads by the days it was the newest one.

• Mac (.dmg): release 1.23.4, current through the Arc news, did 9,149 downloads a day. The median across 41 releases that were current for 3+ days since November 2025 is 5,750. That is +59%, and the previous best of the 41 was 8,561.
• Windows (.exe): 7,160 a day against a 7,345 median. Flat, even a hair down.

That split is the whole story. Arc was a Mac-first product that shipped on Windows in 2024. If Zen were just having a good week, both platforms would rise. Only the Mac moved, right when Mac users were told their browser has 61 days left.

One honest caveat: the 1.23.4 window started October 21, about a day before the farewell post, and Homebrew updates also fetch the .dmg. Both effects push in the same direction every release, which is why we compare against Zen's own history rather than an absolute number. A fair read is that a few thousand extra Mac installs a day are landing on Zen, and that is a lower bound, since plenty of switchers download from mirrors or already had Zen installed.

The HN farewell thread voted with its tabs

The Hacker News thread on Arc's farewell hit 282 points and 252 comments. We read all 252 and counted every commenter who said, in the first person, what browser they use now. 23 people did.

• Zen: 7. "Just migrated to Zen this afternoon [...] it's ok so far," wrote thiht. Constantlm called it "a near drop-in replacement for Arc."
• Dia: 4. The fans exist. Piazz said "You can just turn off / ignore the AI crap and it's great; just like Arc."
• Helium: 4, Brave: 3, Vivaldi: 2, Safari, Orion and Chrome: 1 each.

That is 19 of 23, or 83%, choosing something other than the browser Arc's own makers built as its replacement. Three more people said they tried Dia and bailed. "I've tried switching from Arc to Dia several times over the past year and Dia was always significantly worse," wrote jhaile, naming Peek, Air Traffic Control and nested folders as the missing pieces.

By raw mentions, Dia does lead: 42 comments name it versus 35 for Zen and 33 for Firefox. Read them and most of those Dia mentions are complaints, which is the funniest possible outcome for a product launch. HN skews technical, so treat this as a signal from Arc's loudest power users, not a census.

The attention spike went to Arc's grave, then to the exits

Wikipedia is a decent proxy for "people trying to figure out what just happened." The English article on Arc averaged 178 views a day from September 1 to October 21. It did 1,864 on October 22 and 1,921 on October 23, more than 10x normal.

The Zen Browser article went from a 285 median to 550, 719 and 502 over the same three days, about 2.5x. We could not find an English Wikipedia article for Dia at all as of today. Make of that what you will. Lowkey, it says a lot about which browser the internet thinks is the story.

Why people don't trust Dia: the pricing page answers it

Dia's core browser is free and, per The Browser Company, "the AI is optional." Fair. But the plans page shows where the business lives: Better Answers at $20 a month in the FAQ (the plan card shows $10) and Better Days at $100 a month for "6x the usage" plus a daily briefing, with extra usage sold in $20 credits.

That is the subtext of half the HN comments. "I don't want to be pushed towards a $100 per month plan where the key feature is an AI morning brief," wrote kvam. Our read: Arc users were the free tier of a company whose acquirer books its value as an enterprise AI product. When the free tier stops paying for itself, it gets a farewell page.

And they will not open source it. A May 2025 TechCrunch report said the company was weighing that option. The sunset page offers an export button instead.

Arc died younger than most Google products

Arc's public launch was July 25, 2023, per The Verge. Shutdown is December 22, 2026. That is a 3.41-year life.

We ran it against the Killed by Google graveyard, the internet's favorite list of products a giant gave up on. Of its 308 entries, 61.7% lived longer than Arc. The median dead Google product made it 4.13 years. Google, the company everyone roasts for killing things, has been more patient than Atlassian was with a browser people genuinely loved.

The bigger pattern is not Atlassian being evil. It is that anything you rent from a venture-backed or acquired company has a business model you do not control. We saw the same thing this morning with Google killing Nest thermostats, and with Europe's slow-motion dependence on Microsoft. Open source forks like Zen exist because the community got burned once and decided not to again. Our bet: Zen crosses 50,000 GitHub stars (45,255 today) before Arc goes dark on December 22.

What this means for you

If you use Arc, do these three things this week, not on December 21.

1. Update Arc and export. The latest Arc build added a full data export. Run it now and keep the file somewhere that is not Arc's cloud, because accounts and data get deleted within 30 days of December 22.
2. Pick a browser on purpose. Want the closest Arc feel and open source code nobody can sunset? Zen, with the community arc-to-zen importer. Want Chromium and Chrome extensions without the extras? Helium or Brave. Want the official path and do not mind the AI upsell? Dia imports everything in a few clicks.
3. Move your mobile setup before November 23. That is when sign-in and tab sync die on iOS and Android, a month before the desktop app.

The deeper move is to own the tools your work depends on. That is why we build offline, local-first tools at Tensorust: nothing a server can switch off. Our AI Builder Kit is five offline apps that keep your AI building what you meant, and if it does not, we keep working with you at no extra cost until it does.

More from us: Tensorust news, AI industry coverage, and the raw numbers behind this piece in the download below. Not financial advice.

Sources

• The Browser Company, A farewell to Arc, Oct 22 2026 (checked Oct 25 2026)
• Atlassian, Form 10-K for fiscal 2026, Note 7 Business Combinations, filed Aug 14 2026
• zen-browser/desktop releases, GitHub API, pulled Oct 25 2026
• Hacker News, A farewell to Arc browser, Oct 22 2026, all 252 comments read Oct 25 2026
• Wikimedia pageviews API, Arc (web browser) and Zen Browser, Sep 1 to Oct 24 2026
• Dia, Plans, checked Oct 25 2026
• The Verge, Jay Peters, Arc browser is shutting down, Oct 22 2026
• Thurrott, Laurent Giret, The Browser Company retires its Arc browser, Oct 22 2026
• The Verge, Atlassian buys The Browser Company for $610 million, Sep 2025
• TechCrunch, The Browser Company mulls open sourcing Arc, May 27 2025
• The Verge, Arc is now available for anyone to download, Jul 25 2023
• Killed by Google, graveyard.json, pulled Oct 25 2026