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Cosmik Updates: September 2026

Introducing Aster and MOSAIC, Semble gets a reader mode and Lea integration

Ronen Tamari
Oct 5, 20264 min read1 read
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he leaves are turning color, the last of the holidays is over and we’re back in full swing!

Cosmik

September was a big month for ecosystem initiatives - weaving the shared networks, identity and funding that apps like @semble.so and the rest of @atproto.science depend on.

  • We supported @roomy.space 's work on federated channels, which let a group chat space share selected channels with other spaces so people can join in from either side. The first use case is the @atproto.science chat, which over time could gather channels from projects across the ATScience ecosystem in one place. Thanks to @meri.garden for the development work!
  • We used the Roomy chat to coordinate the @aster.id launch! Aster is a new not-for-profit offering Atmosphere account hosting for researchers: an identity you own (@you.aster.id) that works across Bluesky and the 30+ ATScience apps. It grew out of the atproto.science community and opens as an invite-only beta at IOSP.

Semble

  • Semble Reader: an in-app reading view designed for focus and link foraging. Hover over any link in an article (long press on mobile) to save or connect it, or pull up a list of every link in the piece.
  • A redesigned Explore page for finding content and curators across the network: cards you haven't seen yet, active collections close to what you've been saving, and people who share your interests or whom you already know from Bluesky.
  • Tags and @mentions now work in card notes, connection notes and collection descriptions. Every tag gets its own page listing everything tagged with it, filterable by user.
  • An initial integration with Lea, the Bluesky client for researchers. Switch it on in Lea's settings and Bluesky posts with link embeds get enhanced with the same context you’d see in Semble: library, collection, note and connection counts for that link; all link embeds get a "More like this" dropdown, surfacing content recommended by Semble; and Semble collections appear as a tab on profiles. Thanks to @eugenevinitsky.bsky.social for building it with @wesleyfinck.org!

Community

  • @chive.pub, the atproto preprint service, added an Atmosphere tab to papers that collects records from across the network that refer to them - including Semble collections and connections, alongside Leaflet posts, Margin annotations and more. Where traditional science flattens this kind of engagement into a "mentions" counter, interfaces like this let us start recognizing these as diverse contributions in their own right.
  • @paperpilot.dev inspired us with a creative new use of Semble: he synced his digital garden so that every page is a card and every reference a connection, which means people already holding those links get notified about his writing. We wrote up the pattern - a novel way for writing to find its readers without having to go viral - in the second post of our Patterns of Sensemaking series:

Article

  • @there-hugo.dev shipped social graph sync on @airglow.run: tick the apps you use (Bluesky, Tangled, Sifa, Grain and Semble) and your follows stay the same across all of them. It also remembers who you're waiting for, so when someone you follow elsewhere joins Semble, you follow them there automatically!
  • Hot on the heels of tags landing in Semble, @chrisshank.com added settings to Zemble, the Zotero plugin for Semble, that sync your tags and connections from Zotero to Semble.
  • Skyreader launched Reading Rooms, an experimental feature for reading together: a room is a Semble or @margin.at collection you can join, showing who else is reading and how far along everyone has gotten. @disnetdev.com 's aim is to eventually recreate the feel of a book club or journal club.

On our Radar

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