Analog Canvas

Analog Canvas is a local-first, connectivity-aware schematic editor for the web. Draw and organize hierarchical circuits, import structural SPICE, export deterministic SPICE/Spectre netlists and vector SVG/PDF, publish selected work to the Community Gallery, and connect authorized Agents through the same typed edit model.

Browse the Gallery · Open the editor · Documentation · GitHub repository

• Connectivity-aware editing: place devices, route wires, distinguish Crossings from Junctions, label Nets, and make undoable multi-object edits without treating drawing geometry as electrical truth.
• Reusable hierarchy: author each schematic as a Cell, define independent Cell Pins, place reusable hierarchical blocks, and navigate between callers and child Cells.
• Projects and interchange: save a private Cloud Project, import/export canonical .icproj.json, import structural .cir, .sp, and .spi files, and export deterministic structural SPICE or Spectre. The Preview editor also provides a saved Testbench setup and a fixed ngspice/SKY130 environment for qualified OP, DC, AC, and TRAN runs; Production availability remains release-controlled.
• Publication-ready output: the web editor's SVG and PDF exports remain vector graphics; PNG is rendered at 3× raster scale.
• Community publishing: signed-in users can publish selected circuits with server-rendered previews, tags, likes, moderation, and bounded version history. Publishing is deliberate and is not a backup mechanism.
• Agent integration: the typed Snapshot and transaction API is available through a version-pinned stdio MCP adapter, an HTTP Agent Kit, and the published OpenAPI contract. See the Agent integration guide.

An explicit File / Save updates one private Cloud Project in place. Local .icproj.json files are portable import/export and backup artifacts; browser recovery is an origin-local crash-safety copy. Neither is confused with formal Cloud Save, and Community Gallery entries remain separate public publications. The hosted service keeps its visitor reporting first-party and honors browser Do Not Track instead of embedding a third-party analytics tracker.

Check and Save runs ERC and visual checks on demand, displays findings in Issues and the canvas, and saves through that same Cloud Project service. Findings do not block saving; editing invalidates the last check without automatically rerunning it. File / Save and Ctrl+S remain save-only.

• Use the hosted product: browse the Community Gallery or start a new circuit.
• Learn the editor: Getting started, schematic hierarchy, compatibility, and troubleshooting.
• Understand the product: current architecture and documentation map.
• Develop or contribute: working rules, current development reading set, and test system.

Requires Node.js 24 or newer and pnpm 11.16.0 or newer.

pnpm install --frozen-lockfile
pnpm dev

Open the displayed loopback URL and choose New Circuit, or open its /editor route directly. Create a circuit from the component palette, or import one .cir, .sp, or .spi entry together with its local include files.

• apps/editor/: React/SVG editor plus the Gallery, account, moderation, and analytics screens.
• apps/local-host/: loopback-only production host for the installable PWA.
• apps/mcp-server/: packaged stdio MCP adapter for authorized Agent sessions.
• packages/model/, packages/project-protocol/, and packages/edit-engine/: current persisted circuit model, bounded file compatibility, and atomic mutation boundary.
• packages/spice/, packages/devices/, packages/symbols/, and packages/netlist/: structural SPICE import, built-in device facts, symbol semantics, and deterministic design-netlist export.
• packages/exporters/ and packages/render-svg/: formal SVG, PNG, and PDF output.
• packages/agent-adapter/, packages/agent-client/, and packages/agent-routing/: shared Agent contract, client, and routing logic.
• worker/: Cloudflare Worker and Durable Objects for static hosting, Gallery, accounts, first-party analytics, and Agent relay sessions.
• docs/: current architecture, user guides, normative contracts, ADRs, and delivery plans.

The Razavi reference manifest is the sole visual authority. The production Worker is deployed from main by the Cloudflare workflow.

Copyright © 2026 Zengchun Chen and Zhishuai Zhang.

Except where otherwise noted, Analog Canvas is licensed under the GNU Affero General Public License v3.0 only (AGPL-3.0-only). Modified versions that are distributed or made available for remote network interaction must provide their Corresponding Source under the same license. Third-party dependencies, reference material, and assets retain their respective copyright and license terms.

If you use Analog Canvas in research, teaching, or another publication, cite:

Zengchun Chen and Zhishuai Zhang. Analog Canvas. 2026. Available at: https://analog-canvas.tokenzhang.com/ Source code: https://github.com/cascode-ai/analog-canvas

@software{chen2026analogcanvas,
  author = {Chen, Zengchun and Zhang, Zhishuai},
  title = {Analog Canvas},
  year = {2026},
  url = {https://analog-canvas.tokenzhang.com/},
  note = {Source code: https://github.com/cascode-ai/analog-canvas}
}