The standalone app, built on the AT Protocol and powered by Anthropic’s Claude, was unveiled at the ATmosphere conference by Jay Graber, who stepped back from Bluesky’s CEO role specifically to build it. It’s currently invite-only, with a waitlist open.
Bluesky’s best-known differentiator from X and Threads has always been its custom feed system, the ability to subscribe to algorithmically curated streams built by anyone, not just the platform. The problem has been that building those feeds required knowing how to write code.
Attie, a new standalone app unveiled at Bluesky’s ATmosphere developer conference over the weekend, is designed to close that gap entirely. Attie lets users build personalised social feeds by describing what they want in plain language, the same way they would talk to any other AI assistant.
Examples on the app’s website include prompts like “Show me electronic music and experimental sound from people in my network” or “Builders working on agent infrastructure and open protocol design.”
The app translates those descriptions into working feeds, which can then be used within Bluesky or any other application built on the AT Protocol.
It runs on Anthropic’s Claude under the hood. At launch, Attie is invite-only and available initially to ATmosphere conference attendees; a public waitlist is open.
The app was built by Jay Graber and a newly formed team called the Exploration team. Graber, who co-founded and was Bluesky’s CEO, stepped back from the operational role a few months ago to return to building.
Toni Schneider, a partner at True Ventures, one of Bluesky’s backers, has taken over as interim CEO. Graber presented Attie at ATmosphere alongside Bluesky CTO Paul Frazee.
Attie is a standalone product, not a feature of the Bluesky app, and it is built on the AT Protocol, the open-source decentralised framework that underpins Bluesky and a growing ecosystem of other applications, collectively referred to as the Atmosphere.
Users sign in with their Atmosphere login, which means their existing Bluesky account works. Because the AT Protocol is an open data system, Attie can immediately understand a user’s interests and social context across the whole ecosystem, not just Bluesky itself.
The longer-term roadmap for Attie goes further: the plan is to allow users to vibe-code their own social applications from scratch, not just customise feeds. Schneider described it as “the beginning of just having a lot more people be able to build on top of the Atmosphere.”
Bluesky’s Jay Graber was explicit about the philosophy behind the product. In a blog post accompanying the launch, she wrote that major platforms “aren’t trying to fix” the problem of AI-driven signal degradation on social media: “They’re using AI to increase the time users spend on-platform, to harvest training data, and to shape what users see and believe through systems they can’t inspect and didn’t choose.”
Attie is framed as the inverse: AI that gives users control over their own algorithmic environment rather than removing it. The company, which recently raised $100 million and counts more than 43 million users, has positioned Attie as its dedicated sandbox for agentic social experimentation, separate from the main Bluesky app that those users rely on.
