Community

An open community, federated by domain.

Zarr is built and stewarded in the open. The core community meets bi-weekly; sister communities like NGFF, GeoZarr, and Anndata build domain conventions on top with their own governance. Everyone is welcome.

📅

Meet

Bi-weekly community calls and ZEP meetings, open to all.

• Community calls — agenda, joining info, calendar
• ZEP meetings — proposal review and discussion
• Office hours — drop in with questions

📐

Build

Propose changes to the spec, ship implementations, contribute conventions.

• Zarr Enhancement Proposals (ZEPs) — how the spec evolves
• zarr-specs — issues, discussion, drafts
• Governance — steering council, voting

💬

Connect

Chat, share work, follow updates.

• Zulip — real-time chat with maintainers and users
• GitHub Discussions — Python usage questions
• Blog — updates and guest posts
• Bluesky · Mastodon · YouTube

Related communities

Several communities build domain conventions on top of the Zarr specification with their own meetings and governance. They are independent of zarr-developers — you are welcome in any of them.

NGFF / OME-Zarr →

Next-Generation File Format community for bio-imaging. Governed by the OME consortium with its own meetings and process.

GeoZarr OGC SWG →

An Open Geospatial Consortium Standards Working Group developing GeoZarr for Earth-observation data.

Anndata-Zarr →

Single-cell and genomics data on Zarr. Built and governed within the Scverse ecosystem.

We coordinate through shared ZEPs and the Zarr specification.

All community spaces follow the Zarr Code of Conduct.