You don't have a "Bluesky account"

Today, we’ll be talking about what your “Bluesky account” is really capable of, what else you can do with it, and why you should stop calling it your “Bluesky account”. But first, let’s take a look at why you are calling it that!

In “classic” apps, you might have an account for each app. You might have a Discord account to chat with your friends, a Spotify account to listen to music, or a Google account to watch YouTube videos. If you think about it, this makes sense: each app needs its own way to get your information, so you have separate accounts, which allows for separate passwords and maybe even email addresses.

But if you think about it a little harder, one of the above makes a little less sense. Why don’t you have a YouTube account again?

You see, originally, users on YouTube did have “YouTube accounts”! That is until 2009, when Google, the new owners of YouTube, changed it so you could log in using your Google account. Isn’t that incredibly convenient? Well, for the users of the past, it probably wasn’t. But for us, it absolutely is! Now, your Google account has become this unified home for all things Google. Your email, your calendar, your web searching, your apps from the Play Store, your documents, your…

You know what, if I continue, this post will be enough to put even the most devoted readers to sleep. What I’m trying to say is: it’s kind of awesome you can use that single account to sign into so many apps, some that aren’t even made by Google themselves! We all know the “Sign in with Google” button that some websites offer.

I just mentioned Google as a prime example of the “Log in with” button. But they’re not the only ones, many other companies and platforms offer these buttons! Here’s a quick list:

Basically, there are a lot of options for the people making their apps to choose from. Yes, people making apps need to manually implement each and every one of them! But they all work the same way: you sign in using some other service, and that other service tells the app you want to log in with who you are. Developers call this standard way of signing into other apps using a specific account “OAuth”.

Now, I started this post out by mentioning that your Bluesky account isn’t just a “Bluesky account”. Maybe, while reading, you’ve already thought about the connection I’m trying to make here: you can use your “Bluesky account” to log into other apps as well! That’s not wrong, it is capable of that.

But it can do much, much more. That’s because your “Bluesky account” isn’t just an account for Bluesky. It’s the account you can use to log into a wealth of other apps, all of which (including Bluesky!) make up what we call The Atmosphere. And, just in case you ever hear the term AT Protocol (ATproto), that’s the technology the Atmosphere is built with!

With traditional accounts, your account is tied to a single platform or company. You might be able to log into other platforms using that account, if they support it, like Google does. But your precious data still stays with them.

Your “Bluesky account” may allow you to log into specific apps as well, but the data behind it actually isn’t owned by Bluesky! To understand why this is the case, we need to understand how Bluesky (and by extension, all other apps in the Atmosphere) work. And to understand what the difference to traditional apps is, we need to understand how they work, too!

A “normal” app works by storing all user data in a database. All user data lives in it. Take Twitter for an example: your posts, your account, your profile picture, everything lives in a single database operated by Twitter. If Twitter ever were to shut down or change owners (luckily, that’d never happen), that data still sits with them.

If you wanted to move to a different platform, for example, Bluesky, you’d have to leave all of this data behind and start from scratch. See the interactive example below: when Twitter shuts down, all data goes with it. Hit the button in the top right for a neat visualization!

AliceBobCharliePeterTwittergoneAliceBobCharliePeterEveryone's account and posts live on servers that Twitter ownsTwitter is gone, and everyone's posts went with it. Nobody can take them to another app now...

That’s where the Atmosphere is different.

Instead of a single big server operated by a single owner, the Atmosphere is made up of multiple, smaller servers, that all make up the Atmosphere together. There are two main pieces we should know about, PDSs and AppViews:

In the (interactive) diagram below, you can see that there are multiple PDSs and multiple AppViews. That’s because, in the Atmosphere, you’re not required to use any specific PDS or AppView, meaning you can mix and match them.

The thing that stores your data can interact with any app that would like to use this data. In turn, any app that would like to use data can ask any host, no matter who controls it.

This leads to a system where, no matter who hosts your account, you can use any app you like, and you can move between account hosts and apps without losing any data! That’s the reason we call our accounts Atmosphere accounts, not “Bluesky accounts”.

AliceBobCharliePeterAccount host(PDS)AliceBobAccount host(PDS)CharliePeterBlueskyofflineMu SocialofflineBoth apps show posts from both account hosts. Everyone's posts live with the host they picked.Bluesky is offline. Everyone's posts are still with their account host, and Mu Social still shows all of them.Mu Social is offline. No posts are lost, and Bluesky still shows all of them.Both apps are offline, and every post is still with its account host. Any new app can show them.

If an app ever prompts you for a “handle” and says to log in with your Atmosphere account or Bluesky account, that means it would like to connect to your PDS, so it asks you to allow it access to that data.

This is the “Log in with [APP]” experience! After you enter your handle (for example, alice.bsky.social), you’ll be redirected to your PDS to log in. Don’t be afraid to enter your password here, the app you want to use won’t be able to see it. That screen will look something like this:

Anyway, that was a lot of bold text for something fairly theoretical. Let’s take a look at how this looks in practice!

Imagine a user, say, “Alice”. Alice wants to use a Bluesky client to post about her daily meals to share these posts with the world! Alice signed up using the Bluesky app and used to like it, but she does not want to use Bluesky directly anymore because of personal reasons.

So, instead of the Bluesky app (bsky.app or the mobile app), she uses a different client, like Mu Social! She can log in there using her existing account and can continue using Bluesky, but via a European-based website and/or app.

Later, Alice notices that her PDS is still operated by Bluesky. She’d like to have her PDS be located in the EU, though! So, she finds a PDS host operating in the EU, like Eurosky, and uses a service like move.eurosky.tech to migrate her existing account.

Now, both her account data and the app she uses are from the EU! And if Alice ever decides to switch apps or account hosts again, no problem: moving is free and easy to do! See the (interactive) diagram below.

The app Alice usesHer account host (PDS)AliceBlueskyMu SocialBluesky, USAEurosky, EUAlice signs up through the Bluesky app. Her account and posts live with Bluesky's account host in the USA.Alice switches to Mu Social and logs in with the same account. Her posts show up right away, because they never moved!Alice moves her account to Eurosky, an account host in the EU. Her posts move with her, and Mu Social shows them from there!

Truth is, there are many, many Bluesky clients Alice and you can use. Here’s a small overview of some I know of:

And of course, there are a lot of Atmosphere apps that you can use with your existing account right now. Platforms like the ATstore make them easy to find! There’s a lot of variety, with apps for blogging, productivity, even video games. And yours truly is working on a Discord alternative built on the Atmosphere, called Colibri!

That was a lot of information! If you’re thinking about moving your Atmosphere account to a different account host that isn’t Eurosky, there are resources to help you. PDS MOOver is an amazing tool for both: it helps you find PDSs, then helps you migrate to them.

I hope your explorations of the Atmosphere will help you find many new apps you enjoy using! The developers making them are incredibly enthusiastic about getting a second chance at building a social internet. So, if you found this post to be helpful in any way, please do share it!

I believe the more people understand the significance of this network and the technology, the better it is going to get. And if you can, feel free to buy me a coffee using the button below. Help fuel my caffeine addiction and all that.