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 · Windows preview (ZIP) · Documentation · GitHub repository

Highlights

• Connectivity-aware editing: place devices, route wires, distinguish Crossings from Junctions, label Nets, and make undoable multi-object edits deriving physical networks from completed wire edits while keeping logical labels and unrouted import intent explicit.
• 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, .spi, and .scs files, and export deterministic structural SPICE or Spectre. Keep a Testbench and Specs beside the circuit and run the exported netlist with your own simulator and PDK.
• 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.
• Command line: draw a schematic and export its PNG, SVG and netlist with no browser, from one downloaded script. See the command-line guide.

Project ownership and privacy

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. Shelf cards offer Version history for the latest three earlier saves: compare component changes, restore with conflict protection, or create an independent private branch. Restoring a draft never updates its Gallery publication. Refreshing the editor restores that browser window’s open project tabs, including unsaved circuit content, the active tab, and view positions. This browser-local workspace does not replace Cloud Save or portable file backups; undo stacks and unfinished text-field edits are not restored. Hosted topology checks run against the clicked snapshot in a private background task. Refreshing or closing the page does not cancel it; reopen the editor to view progress/results. Results remain available for seven days. Comparisons use bounded search and explicitly mark incomplete coverage; the best 20 results are retained within an 8 MiB result budget. Vite without the hosted backend shows a local-only fallback that requires keeping its page open. 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.

Start here

• Use the hosted product: browse the Community Gallery or start a new circuit.
• Try the Windows desktop preview: download and run the preview.
• Learn the editor: Getting started, schematic hierarchy, Testbench and simulation, compatibility, and troubleshooting.
• Understand the product: current architecture and documentation map.
• Develop or contribute: development workflow, Agent entry, original skills and setup, current development reading set, and test system.

For Claude Code, run pnpm setup:skills once in each checkout or worktree before starting a session. Choose slash commands from the shared workflow stage entries. Both clients use the same checked-in original skills; setup and conflict recovery describe how the local registration works.

Windows desktop preview

Windows desktop PowerPoint users can optionally install the local PowerPoint integration to create circuit drawings and reopen their embedded Projects from slides. It is built and installed separately; hosted and standalone desktop use remain unchanged.

This is the beginning of the README. Read the rest at the original. Read the full README ↗