Pennant

Spec sheet

Product

Pennant is an open-source computational notebook for real-time collaboration and flexible code execution in Markdown, JavaScript, and Python.Read 12 Oct 2026 · github.com

License

Pennant Notebook is MIT licensed.Read 12 Oct 2026 · github.com

Code contributions

The README invites users to submit issues, feature requests, and pull requests.Read 12 Oct 2026 · github.com

Code editor

The README says CodeMirror 6 provides the coding environment and integrates with Yjs for collaborative editing.Read 12 Oct 2026 · github.com

Collaboration

The README says Yjs enables real-time collaboration and synchronization between users.Read 12 Oct 2026 · github.com

Deployment options

noneRead 22 Sep 2026 · trypennant.com

Documentation

The README links to preliminary documentation at docs.trypennant.com.Read 12 Oct 2026 · github.com

Execution

Users can run individual cells or a full notebook, with a shared execution context whose outputs update in real time for connected users.Read 12 Oct 2026 · github.com

Full-stack runtime

NoRead 22 Sep 2026 · trypennant.com

Interface

The repository contains the React application for the Pennant Notebook project.Read 12 Oct 2026 · github.com

Languages

The README describes JavaScript and Python support, and lists Go and Ruby as upcoming language support.Read 12 Oct 2026 · github.com

Markdown

The README lists BlockNote as the Markdown editing component.Read 12 Oct 2026 · github.com

Offline persistence

The README lists caching and offline capabilities through y-indexeddb.Read 12 Oct 2026 · github.com

Real-time collaboration

YesRead 22 Sep 2026 · trypennant.com

Setup

The README says the project uses a multi-repository structure and points to its contributing guide for setup across components.Read 12 Oct 2026 · github.com

Plans and prices

Every Pennant plan and price →

Where Specifiction places it

• Coding Playgrounds#104 of 1387.5