canvasprotocol.org

What It Is

Open Canvas Working Group (OCWG) is an open working group focused on interoperability for “infinite canvas” tools. Its goal is not to offer a single SaaS product, but to promote the Open Canvas Interchange Format (OCIF) as a common format that can be exchanged, synchronized, and verified across different canvas tools. The OCIF specification is currently at the Candidate Recommendation stage; according to the website, it has undergone broad review, meets technical requirements, and is now collecting implementation feedback.

Core Capabilities and Ecosystem

In terms of functionality and use cases, OCWG focuses on three areas: defining a minimum common file format for storage and serialization; demonstrating real-time synchronization between different tools; and building a testbed similar to CSS Acid Tests to validate standards compliance. Meeting notes show that its discussions go into considerable detail, covering nodes, relationships, resources, Schema structure, ID management, coordinate systems, arrows, Z-order, transclusion, nested canvases, resource packaging, extension mechanisms, and more.

As for supported languages/frameworks, the collected text does not list any official language SDKs, but frequently mentions JSON Schema, JSON Linked Data, converters, validators, libraries, and test suites. On the ecosystem side, OCWG has discussed interoperability with Obsidian Canvas, TLDraw, and Excalidraw. It also makes its main discussions and artifacts public on GitHub, while using Discord, email, and biweekly meetings to maintain community collaboration.

Pricing and Openness

The text does not mention commercial pricing, subscriptions, or payment methods. OCWG is more like an open standards community, with its main outputs being specifications, meeting materials, and future tooling. Its “open working group” model and public GitHub discussions are developer-friendly, but the collected text does not clearly specify a license, so it is not possible to definitively state the full scope of its open-source licensing.

Pros and Cons

Its strengths are a clear focus and a practical attempt to solve the long-standing fragmentation of file formats among canvas tools. The specification appears relatively mature and places emphasis on implementation feedback, validation, testing, and round-trip file fidelity. The drawbacks are that it is still largely in the standards-development stage rather than an out-of-the-box product; information on official SDKs, APIs, a stable 1.0 release, the number of independent implementations, and production use cases remains limited. While the documentation is transparent, there are many meeting materials and the concepts are complex, so the integration cost is not low.

Who It’s For and Access from China

OCWG is suitable for developers of infinite canvas, whiteboard, knowledge management, graphical editor, and flowchart tools, as well as teams looking to implement import/export and cross-tool synchronization. As for access from China, the status of the official website itself is unknown; however, collaboration and hosting channels such as GitHub, Discord, and Cloudflare Pages may be unstable or partially restricted in mainland China. It is advisable to prepare a proxy and consider local alternatives, such as directly adapting Excalidraw, tldraw, Obsidian Canvas, or a custom format-conversion layer.