Browse like you always do. Then, in one click, see the same page the way an iPhone in Lisbon, an iPad in Tokyo or a laptop in Rome sees it: real device, real language, real time zone.
This is live: switch device, rotate, change language and theme. The site inside responds the way it would in Oblo.
Not a resized window
Shrinking a window only changes the width. Oblo changes everything the page can measure: in JavaScript, in CSS and in the headers your server reads.
What’s inside
Size, pixel density, touch, user agent and client hints of iPhone, Pixel, Galaxy and iPad. Breakpoints fire like on the phone.
Accept-Language, navigator.languages, Intl, time zone and location change together. Your server notices too.
Slow networks, throttled CPU, reduced motion, contrast, forced colors and vision deficiencies, from one menu.
Title, description, Open Graph, hreflang, canonical and image alt in one panel, with a share preview.
A badge counts exceptions, console.error and failed requests without opening the Console.
A QR code opens the page on your phone, with localhost already swapped for your LAN IP.
The same page on three devices side by side, every command one search away, and the fastest way to show someone what’s wrong.
First launch
On first launch a step-by-step tour lights up, one at a time, the buttons a regular browser doesn’t have, and puts them to work on real pages. Press Esc to skip it, and reopen it any time from Settings or the command palette.
The next two features we’re working on. They’ll arrive in an update, like everything else.
In development
Site passwords saved and filled in by Oblo itself, no extension needed.
In development
Bookmarks, history and settings, the same on every computer you use Oblo on.
Where it comes from
From a studio that uses it every day.
Oblo was born inside Line33, where we check client sites on phones, tablets and different markets every day. Resizing a window wasn’t enough anymore: we needed to see what people on the other side actually see.
It was an internal tool. It turned out so useful that we decided to give it away, and to make it the browser we use all day.
Who it’s for
Breakpoints, touch, language and network without opening DevTools on every page.
Make sure the layout holds on every screen before handing it off.
Show clients their site the way it will look on their own phone.
Multilingual sites, prices, dates and times checked country by country.
Questions
Yes. Oblo is freeware: use it for work too, with no subscription and no account.
Yes: tabs that come back, history autocomplete in the address bar, bookmarks and the search engine you like. When you’re not testing a site, it’s a fast Chromium browser. Extensions aren’t supported yet.
Oblo uses Chrome’s engine. Size, touch, language and user agent match the device, but for Safari’s exact rendering you still need a Mac or an iPhone. On Windows, Apple’s fonts are replaced with Inter, which has similar metrics.
No. There’s no account and no tracking of the sites you visit. The app only checks whether a newer version exists.
By itself: it downloads the new version in the background and installs it when you quit.
From oblò, Italian for porthole: the small round window you look through to see what’s on the other side. It used to be called Proteus.
Download
Apple Silicon and Intel, macOS 13 or later
Build: Apple Silicon · Intel
Installer for Windows 10 and 11, 64-bit
The installer isn’t signed yet: if Windows shows a warning, choose “More info” and then “Run anyway”.
deb package for Ubuntu and Debian, 64-bit
Open the .deb with the Software app or install it with sudo apt install ./oblo_*.deb. On other distributions use the AppImage (needs libfuse2).