It’s Mach based, so it has Mach ports, which are an IPC system that is fairly heavily used by macOS.
It has DriverKit, which is a C++ framework for drivers that’s got morecsuppirt than the usual Unix driver model.
Mach-O does more than ELF, and enables the two-layer namespacing that makes macOS able to manage dynamic linking dependencies better than ELF.
Nothing really earth-shattering but interesting enough. And far easier to build a macOS environment on than FreeBSD.
AFAIK all macos software only talks to the kernel via userland APIs - so there's no particular benefit to basing ravynOS on XNU anyway. (Just the opinion of a layman.)
It's been a stable foundation for several of the most successful operating systems in history though
New OS aims to provide (some) compatibility with macOS - https://news.ycombinator.com/item?id=45997212 - Nov 2025 (165 comments)
RavynOS Finesse of macOS. Freedom of FreeBSD - https://news.ycombinator.com/item?id=38485596 - Dec 2023 (176 comments)
RavynOS – Finesse of macOS, freedom of FreeBSD - https://news.ycombinator.com/item?id=32492514 - Aug 2022 (366 comments)
as far as i understand it, most companies don’t bother sending cease and desists to projects you’ve never heard of. the fact that the aforementioned projects have avoided the banhammer of Apple should not be an indication that a successful MacOS clone would receive the same treatment.
but on the other hand, maybe that’s a champagne problem. if you can make a macos clone good enough to get the attention of Apple, you’ve already done something incredible.
GitHub repo indicates they're working on basic, basic, bringup. Like, Objective-C works at all and CLI utilities work.
This is gutting, when combined with a prior post showing this dates back 3 years.
Looks great, so sad that it's yet another web framework. Kinda smacks of GNOME, though.
I wonder how big the actual gap between close to Cocoa App compatibility and full app compatibility is? Being able to run MacOS apps natively would unlock a huge barrier to adoption here.
I'm kinda on the opposite end of the spectrum. I love this world where 45 people try to race toward the same goal. Sometimes the best ideas win. Sometimes the fastest to the first goal wins. Sometimes everyone gives up. Sometimes we have competing standards we have to sift through. It's a mess, but it's a beautiful mess.
What has changed about Apple's ecosystem vis a vis openness, hardware, or the 'ecosystem'?
The macOS ecosystem is pretty much the same as it has been since 1997
Their goal was never to build a community around Darwin or get a bunch of people outside the company using Darwin sans Mac OS X's proprietary bits, or to get a bunch of people outside the company contributing to Darwin
> The problem was Darwin was a marketing ploy, and nothing more. Marketing thought that by throwing some source files over the wall, they could increase their market share and revenue. And they were right. You go to almost any technical conference these days, and there is an astonishing number of Mac laptops in the crowd. Prior to Mac OS X, people would have been laughed out of the building for having a Mac, but now, with Mac OS X and the magic of open source, it was suddenly OK or even cool. Managerially and culturally, Apple had no intention of becoming involved with any community outside its own walls. There were some well intentioned engineers and even a few low level managers that were duped by their own marketing department, and that was all. These people had given substantial amounts of their free time under the illusion they were doing something Right, something Good, but in the end were simply used by their own company's marketing department.
Open source software was used for the basis of macOS for Apple’s convenience, not because Apple intended to publish very much open source software.
BSD has a convenient license for these purposes and it’s why proprietary commercial products like the PlayStation 5 choose to use it.
The Mac GUI is closed source. You're not cloning it without being sued by Apple's turbo lawyers or at the very least receive a C&D. This is for console applications?
macOS will now be ARM-only. If you buy Apple hardware you already have a license for the real thing.
Why run a TBD meme OS when you could run Darwin, FreeBSD, Linux, etc. or real macOS to accomplish whatever unclear goals are presented here?
*sigh* This is for no one, there is no viable use case. The ReactOS team will be sending a fruit basket.
The question might then, "why not make this a DE instead?" to which the answer is that Mac users also like how the underpinnings of the OS work (or have worked in older releases) and would like to continue to use their favorite Mac apps, which isn't going to happen as long as any traditional Linux distribution is involved. Mac apps also have a design ethos that's rare among current native Linux apps, which drives demand for alternatives.
To do this properly it really needs to be a whole-OS endeavor.
I wonder if they have a GitHub...
That's what this is. Darwin isn't installable today. Apple just dumps a bunch of source code. Previous attempts at making Darwin bootable didn't go far and had no GUI.
There's also PureDarwin (?) which had been around forever but last I recall the lone developer was seriously ill and the project was not receiving help. I don't see how this would be any different.
To everyone here cheering this on: when will you be contributing? Or are you just waiting to download it, run it once for the lulz, and drag it to the Trash?
Who jammed a toe in your cheerios?
Besides accolades on HN of course.
I'm being real here and frankly blind, empty support of open-source projects does zero to support them.
Like seriously, what do you want here? Or are you just mad at everyone and lashing out?
With that mindset, everything is useless and nothing has a point. Have I made my point?
I regret to actually say this, and mean no controversy - but, I have been actually asking myself just that - and, not in the "workout or not" sense, alone. In the "does anything have a point", way. Apologies.-
PS. To indeed contribute something: I am a big fan of the "doing things because of the joy of doing things" itself theory of it all, which is, seemingly, an antidote.-
"This is a huge effort. Y'all must be crazy!
Yes. Here's to the crazy ones... because the people who are crazy enough to think they can change the world are the ones that do.
In all seriousness, though, it's not my first rodeo. I have no illusions about the scale of building an OS or how long projects like Haiku, ReactOS or GNUStep took to get usable. This is just something I like doing in my Copious Spare Time™ and that I hope will be useful someday.
I've always liked Apple's design and elegance, but am not thrilled with the direction of recent macOS® or how closed the hardware has become. And I'm a big believer in open source. So ... let's build something that feels as elegant, without all the lock-in, and maybe (just maybe) I can get it to a point that reasonably useful Mac apps build & run on it. And if not, we'll build a lot of cool pieces along the way and learn a ton. I'm OK with that."