Indigo: A New App That Bridges Bluesky and Mastodon

Aaron Vegh and Ben McCarthy have launched Indigo, a social media client that lets you use Bluesky and Mastodon from a single app. The application, available on the Apple App Store, combines your feeds from both platforms and lets you post to either or both at the same time.

What Indigo Does

Indigo's main feature is simple: it pulls your posts from Bluesky and Mastodon into one unified feed, sorted by time. You can log into multiple accounts across both platforms without switching between apps or browser tabs.

The cross-posting feature is the real convenience. Instead of writing the same post twice—once for Bluesky, once for Mastodon—you write it once in Indigo and send it to both platforms at the click of a button. For people trying to build an audience across multiple social networks, this removes a real friction point that has kept some users from adopting decentralized social platforms in the first place.

Recent updates also added support for filtering and exploring content from Threads, Meta's social platform. This expands Indigo beyond just the two decentralized networks it launched with, positioning it as a bridge across several different social platforms rather than a tool for one specific community.

How It Works Behind the Scenes

Bluesky and Mastodon work on different technical foundations—Bluesky uses something called AT Protocol, while Mastodon uses ActivityPub. Think of them as different languages for how social networks talk to each other. Indigo translates between them, so you don't have to think about the difference.

For Mastodon, Indigo connects to the standard protocols that power not just Mastodon but a whole ecosystem of federated (decentralized) services—platforms like Pixelfed for photos and PeerTube for video can all talk to Mastodon through the same technical standard.

With Bluesky, Indigo taps into that platform's infrastructure. One advantage Bluesky emphasizes: even though you're using their servers today, the protocol is designed so that in theory your identity and data could move to a different Bluesky-compatible server someday if you wanted to. That's the idea behind "portability" in decentralized networks.

Why This Matters Right Now

Both Bluesky and Mastodon have grown significantly as people have left or reduced their use of Twitter following Elon Musk's acquisition. Bluesky, which started as a research project inside Twitter itself, appeals to people who liked how Twitter worked but want it to be decentralized. Mastodon, which has been around longer, attracts people who care about having choices in which server they use and how their network is governed.

The underlying pattern here is worth noting. We saw something similar in the early 2000s with RSS readers—applications that let you read feeds from many different sources in one place. Later came tools like Hootsuite and Buffer, which let marketers post to Facebook, Twitter, and other platforms simultaneously. In both cases, successful aggregation tools emerged after the underlying technologies had stabilized but before any single dominant platform had locked everyone in through sheer size and convenience.

Managing Multiple Accounts

Indigo's ability to let you customize which content goes where is practical. Mastodon, for instance, lets you add content warnings to posts, and Bluesky is working on algorithms that users can customize. You might want to take advantage of those features on each platform without forcing every post to work the same way everywhere.

This design choice reflects an understanding that Bluesky and Mastodon aren't really direct competitors—they serve different communities and use cases. Indigo treats them as complementary, not interchangeable.

How It's Built and Distributed

Indigo is available through Apple's App Store, which is the conventional route. The creators could have tried to distribute it through alternative app stores or built it as a web app to align more closely with decentralized principles, but they chose the mainstream option instead. That's a practical choice: the App Store is how most people install apps, and it keeps friction low.

It's also worth noting that two people can build something this functional for multiple decentralized social platforms. Both Bluesky's and Mastodon's technical specifications are open and accessible enough that third-party developers can connect to them without needing special permission or massive resources. That's by design—one of the core ideas behind decentralized social networks is that anyone should be able to build client applications on top of them.

Looking ahead, the app will likely add better notification handling, more advanced filtering options, and potentially support for new decentralized social protocols as they emerge. The underlying architecture suggests the developers built it with flexibility in mind, so it can grow as the landscape changes.

The bigger lesson from Indigo may be this: decentralized social networks might succeed not because any single platform becomes huge, but because tools like this make it easier and cheaper to use multiple platforms together. By reducing the friction of jumping between networks, apps like Indigo could help multiple decentralized communities grow in parallel, rather than everyone converging on one winner.