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Note: Over the past couple of years it's been impossible for me to keep working on Stainless and thus the source code for Stainless is now available under the MIT License for those who might be interested in continuing the project.

Thanks to all for your support!...

Stainless is a multi-process browser for OS X Leopard and Snow Leopard.

Although Stainless started out as a technology demo to showcase our own multi-processing architecture in response to Google Chrome, we've been inspired by our growing more...

What's New

Version 0.8:
  • new: OS X 10.7 compatibility
  • new: 64-bit build
  • added: ability to stop downloads in progress
  • added: tab from autocomplete row selects URL for editing
  • added: 3 finger swipe gesture left/right for back/forward (use with option key under Lion)
  • optimized: faster multi-process manager
  • fixed: backward and forward more...


Mac OS X 10.5 or later

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Stainless User Discussion

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Tanner1294 Member IconReview+7

This is definitely a wonderful browser that runs very well even on old PPC Mac's. I love the interface and simplicity of it.

I will say thought that it is definitely under development still. It hasn't reached version 1 yet as the developer (like in the description) intended it as a demo and not a total project. He has however told me via Twitter that this app IS still under active development.

He's also stated that he's still in the process of making Stainless open source and that he's going to keep the PPC binary alive.

Reply0 replies
Version 0.8
Theothertim Member IconReview+86

Stainless has a lot of potential. As mentioned already, it handles Flash better than any other browser I've tried. Why can't Chrome or other browsers run this efficiently?

It does lack many features, which makes it a poor choice for daily use, but as a light browser or for viewing YouTube, it is one of the better options.

Reply0 replies
Version 0.8
El-Duderino Member IconReview+41

This browser could be promising but needs:

• An ad-blocker. And a serious one that blocks as much as the add-ons available with the major browsers, so look at AdBlock, ABP etc and be good as those for blocking all ads everywhere and have way of blocking the 1 or 2 that get through manually too with a right-click function

• 1password support

• Gestures. Can't even do a swipe for forward and back with BTT because for some reason it won't work, the only application I can think of that BTT has not worked with when I have tried it

• Ability to set desired precise search engine string for location bar

• Also seems to have issues with History

• Can I just say ad blocker a 2nd time. And if you can't make it very effective indeed should be a way to add a blocking CSS to improve it

Reply0 replies
Version 0.8
Edgarcabrera Member IconReview+74

This is one of the unsung heroes. This browser has got the best flash player performance and the best processor management. This is a gem... of course lacks of many goodies as FF, Chrome or Safari, but if you are looking for something slim with a fast performance, this is the one.

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Version 0.7.5
Macjudge Member IconReview+38

Stainless is an excellent, light browser that really gives me what I need. I love that, unlike Safari, I can close a tab and recover all memory associated with it.

Unfortunately I haven't seen any development since 2009. What I'm missing the most is a more elegant way to organize bookmarks and a 1password integration.

I would really like to help getting this project back on track!

Reply0 replies
Version 0.7.5
Jazzyguy Member IconReview+3667

Excellent Browser. It is fast and smooth running.

Reply0 replies
Version 0.7.5
Shock-J Member IconReview+259

Glad to see this is becoming a full fledged project. The parallel session technology that "allows you to log into a site using different credentials in separate tabs at the same time" is super cool, especially for Web developers. And Stainless already passes the Acid 3 test. Firfefox 3.5 doesn't even do this yet. Certainly it's missing a lot of features that would make it useful as you daily browser, but it's of to a really good start.

Reply0 replies
Version 0.6.5
itistoday Member IconComment+89

I love innovative ideas like this, but what results is that each tab is a process that on average takes around 39MB of RAM. If I were to use this browser as I use Firefox, with 4 windows open, each with about 8 tabs, I'd be out over a gig of RAM, where Firefox manages to keep the memory usage below 300MB, with more features and several plugins installed.

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Version 0.6
Dr.-Girlfriend Member IconComment+517

This browser sounds really exciting! I'm a long time Firefox user (since the days when it was called Phoenix) and I'm truly disappointed in how bloated, buggy, and memory-intensive Firefox has become. It all boils down to leadership and the Mozilla Foundation has been operating like a beast with too many heads for years now. I want my lean, mean privacy-conscious browser back -- not this gargantuan, crash-prone imposter who shares a bed with Google.

As soon as this browser implements 1Password and a decent ad-blocking program, Firefox's days are numbered.

Reply1 reply
Version 0.6

What she said.

raptor01 Member IconReview+2

This is a great browser! Its missing a few features of a full browser but even so I have been using it as my main portal to the intertubes. The bookmark shelf is genius and the load times seem to beat Safari 4. Also biggest plus it doesn't eat memory like safari! And running youtube on a separate task speeds that up immensely. Can't wait for the full release! O and no crashes or hang ups yet...

Reply0 replies
Version 0.5.4
user icon+0
Version 0.8
user icon+3
Version 0.8
user icon+2
Version 0.8
user icon+7
Version 0.7.5
> 4 21


Current Version (0.x)


Downloads 23,454
Version Downloads 6,655
License Free
Date 25 Jul 2011
Platform OS X / PPC 32 / Intel 32
Price Free
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