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I couldn’t figure out a way to install this.
It looks like it's only on Android/Windows/Blackberry
Does not work for iOS yet? Edit: "At this time, WhatsApp Web is available only for Android, Windows Phone, Nokia S60, BlackBerry and BB10 smartphones." https://www.whatsapp.com/faq/en/web/28080003
Apple's browser is probably lacking necessary features. They have been much slower adopting features than the competition.
It's not the browser ... the iOS app doesn't yet have the capability to scan the QR code to link your account to the website
That doesn't seem likely to me: what features does iOS not have right now, that this is likely to use? It seems more likely if they are targeting chrome only they did it to avoid the support overhead of making it work in multiple browsers.
> They have been much slower adopting features than the competition.

It's not a matter of speed. This seems to be using WebRTC for handling communications between the phone app and the browser. Safari has chosen not to implement WebRTC and so far it is still not a proper standard so I can see why. Google, as the developer of WebRTC, will obviously support it right away. Note that no browser other than Chrome can be used as well.

Wait, you know that WebKit is spearheaded by Apple? And that there's two completely unrelated problems here:

1. The frontend only works on Chrome for desktop (it appears only because it uses the non-standards track filesystem API)

2. The backend service and mobile app does not work with iOS (it appears because it uses background networking)

They may seem related, but they aren't.

<del>Assumption: WhatsApp for iOS is in the 5 business day App Store approval queue.</del>
"Unfortunately for now, we will not be able to provide web client to our iOS users due to Apple platform limitations."

And even if they could, I'd doubt that they'd make Facebook wait 5 days for their app to be aproved.

Assumption: the platform limitation is that it's not allowed to run an app (continuously) in the background, which is required for WhatsApp web
So what exactly is whatsapp web?

[edit] Found the answer at https://www.whatsapp.com/faq/en/web/28080003

> WhatsApp Web is a computer based extension of the WhatsApp account on your phone. The messages you send and receive are fully synced between your phone and your computer, and you can see all messages on both devices. Any action you take on the phone will apply to WhatsApp Web and vice versa.

I'm using Chromium, says it only supports Chrome. Can we shave some characters off the regex here?
As a temporary solution, you could spoof the user agent by running chromium from command line: chromium-browser --user-agent="Mozilla/5.0 (X11; Linux i686) AppleWebKit/535.2 (KHTML, like Gecko) Chrome/39.0.1132.47 Safari/536.11"
I thought that Whatsapp didn't store (or read) messages, and that was why it was so secure / awesome?

So how can they do this?

You're mistaken, they do store. And don't hide it.

Also they don't even encrypt, they send messages over the air in plain text. YAY $16 billion!

Didn't WhatsApp integrate TextSecure?
(comment deleted)
Ugh. This is why I was saying before that I'm quite worried that Whatsapp itself didn't come out and say publicly that it uses TextSecure's end-to-end protocol, and that we should stop praising them for "adopting end-to-end encryption" until they actually say they did (for which I got downvoted).
How is dropping a message to someone who is not online or cannot be reached at that instant because of network connectivity awesome?
I think they still don't store it, What there are doing here is syncing all messages from phone to web when paired. FAQ clearly mentions that web version connects with phone to sync data - https://www.whatsapp.com/faq/en/web/28080002
You must be mixing it with Snapchat.

Note that AFAIR the reason wasn't so that it was more secure, but to remind users that Snapchat is about the instant and so that users wouldn't expect it to store all of their lives, only the right now.

A cheap and easy way to keep your storage needs low, if you ask me.

So it seems to do some pairing between your phone and chrome? Not really what I call a web version. A real web version would run on, you know, any reasonably recent web browser.
I think the point of the pairing itself is more just to make sure people only have as many WhatsApp accounts as they have phone numbers. Not sure why it's Chrome only, though.
I suspect that pairing is needed only to not use an account other that phone number
Doesn't work, apparently you need to scan the code from your phone's WhatsApp which you can't due to lack of that functionality.
Doesn't work for iOS! Better not release it then! :)
iOS users should already be resigned that they'll always receive updates later
installed newest Android version. Does not work here. No option for scanning QR
Did you try:

Menu -> Whats App Web?

There's no option called 'WhatsApp Web". I'm on 2.11.491
My friend said it took a few seconds, then the option appeared. Sorry for the 2nd hand account. I'm on iOS.
This is sweet.

I like being able to chat with my friends while I am at work so I'm glad to see WhatsApp bringing web access.

Hopefully iOS support is around the corner, but given how often iOS gets preferential treatment over Android, I'm okay with my Droid friends getting first crack at it.

The title should more correctly say "Whatsapp for Google Chrome". You can't really say it's for "web" if Chrome is the only browser you support.
I like it. This was certainly needed; especially when I am working.
> WhatsApp Web only works in Google Chrome.

It's 2015, and we're still using browser compatibility checks.

What did they do in an add-on that won't work in Firefox? Chrome add-ons and Firefox add-ons are rather close; I have one that has about 80% common code.
This is truly useless, It needs your phone to stay on to access the web version. And why is it a web version if only Google Chrome is supported.
Its awesome, I can save my phone battery by switching it off and leaving only whatsapp on! boom!
No its not. Your phone needs to stay on the whole time.
Damn, you're right! That's a bit of a downer :(
Really.. I use a dumb feature phone and the only thing I want in is whatsapp..

Thought of signing in once with a smart phone and using it forever and continue using my dumb phone..

Which version of Android app do you use?

2.11.498 seems don't work for me. There isn't a WhatsappWeb option.

How did you even get 2.11.498 (which seems to be newer than mine but still not latest)? I'm trying to download and all I get is 2.11.491.
From Play Store. I think version varies with device.

On WhatsApp site there's still your version.

I think that version is for Nexus 5. I can't install 491, and 498 doesn't have the menu option :(
I'm running 2.11.498 (just updated) on my Android phone and the menu option is there. The new web.whatsapp.com just started working for me this morning.

(I'm on Chrome OS.)

I have been waiting for this move for a long time, but, badly, doesn't support iOS yet :-S
They should have waited with the announcement until they got more browsers supported. This is really frustrating.
Sure, but they gotta start somewhere.
Pleeeease don't hijack my back button
Heck of a roll-out, guys.

  - only works on one browser
  - requires interop with the mobile app
  - supporting mobile app version on Android only
  - supporting mobile app version not universally available on Android, presumably because of Google Play registry population or something.
Also works with mobile apps for WP, BB and BB10. Only iOS support is missing, really.
And every single other major browser.
This is apparently not available in my country (Brazil) ...

Whatsapp version 2.11.476 updated on 16 jan 2015

I guess it's only limited to US and other regions.

Used a US VPN to see whats the latest version and its 2.11.491, which is the same as installed version on mine (India). However, I still don't see the option to scan QR code.
I'm on WP8 which I imagine you probably aren't, so this may not be useful to you, but in case it's relevant across platforms, or in case there are any WP8 readers:

a.) I updated when I saw this HN submission, a 17mb update, to version 2.11.634 (it didn't updated automatically, but was available when I checked my app store)

b.) Opening whatsapp after the update showed it had updated (I could see some other features that had changed), but I couldn't find the web option. After killing whatsapp and restarting it, it then appeared on a menu where it hadn't been before

It's finally working for me, so i guess it will be available worldwide :D
I know everyone is complaining about Chrome only support, but the more important question we should be asking is what technology stack are they using for the web client?

It's well documented that Whatsapp is a Erlang shop.

Did they stay with using Erlang for the web as well ... or did they switch to another technology like Nodejs, etc?

They seem to be using React for the View rendering. Websockets for data. Bluebird for promises. Google's CryptoJS for end-to-end encryption. MomentJS for time formatting.

The code seems to be pretty modular There are some nice gems in it like EXIF format decoding etc. This is nice to reverse engineer :)