Press kit

Descriptions

The same facts in three lengths. Use whichever fits.

One line. Rio is a free, open-source browser for Mac with Arc's sidebar of spaces, built on Chromium.

Short. Rio is a free, open-source web browser for Mac, built on Chromium 158 and licensed under GPL-3.0. It puts your tabs in a sidebar split into spaces, each with its own pinned tabs, folders and logins, and it imports an Arc setup in one step. It runs Chrome Web Store extensions, needs no account, and is signed and notarized by Apple.

Long. Rio is a free, open-source web browser for Mac, made by Levon Adamyan. It is built on Chromium 158, licensed under GPL-3.0, and its code is on GitHub. Rio puts your tabs in a sidebar split into spaces: each space has its own pinned tabs, folders and Today tabs, its own colors, and can use its own profile so its logins stay separate. Rio imports an Arc setup in one step, reading Arc's files on the Mac: spaces, profiles, pinned tabs, folders, favorites, history, saved passwords and sign-ins. It runs Chrome Web Store extensions, including side panel extensions, blocks ads and trackers by default, and adds split view, Peek and a command bar that can ask ChatGPT, Claude or Grok. Rio needs no account, sends no analytics, and is signed with a Developer ID and notarized by Apple.

Key facts

• Name: Rio
• What it is: a web browser for Mac with tabs in a sidebar, grouped into spaces
• Made by: Levon Adamyan, as an independent project
• First release: November 10, 2026
• Releases: 8 from the first release to build 1474 on November 12, 2026; Rio updates itself
• Signed and notarized: signed with a Developer ID and notarized by Apple, since build 1446
• Engine: Chromium 158
• License: GPL-3.0, with the source on GitHub
• Price: free
• Account: none needed
• Analytics: none
• Requirements: a Mac with Apple silicon, macOS 13 or later, about 360 MB
• Imports from: Arc, in one step, and Google Chrome
• Extensions: Chrome Web Store, Manifest V3 and side panel extensions included
• Memory: with the same 10 sites open on one MacBook Pro, Rio added 3,573 MB of memory and Chrome 157 added 4,363 MB, each the mean of 3 runs on an empty test profile, November 11, 2026
• Website: riobrowser.app
• LinkedIn: Rio

The founder

Levon Adamyan built Rio. He ran his whole day in Arc, with 4 spaces, 38 pinned tabs and 29 favorites, and when Arc stopped getting new features he built a browser that kept that sidebar, then moved his whole setup into it in one click. Find him on LinkedIn.

Contact

• Press: [email protected]
• Bugs: GitHub issues
• Releases: github.com/Levivajan/rio-releases

Logo and screenshots

The logo, the app icon and six screenshots are listed at the top of this page. Click one to save the original file. The screenshots are full-resolution captures of Rio on a Mac, 2880 by 1800 pixels: Rio in light and dark mode, the command bar, split view, the Library and the theme editor.

Websites shown in the screenshots belong to their owners, who are not affiliated with and do not endorse Rio.

Names

Rio is an independent project. It contains none of Arc's code and is not affiliated with or endorsed by The Browser Company, Google or Apple. Arc is a trademark of The Browser Company of New York. Other names are trademarks of their owners.

Download Rio for Mac · Questions about Rio · Rio as an Arc alternative