# Eraser API + MCP vs tldraw SDK + MCP > tldraw SDK + MCP has a score of 61 (C) against Eraser API + MCP's 38.7 (E). Both do diagram create. The largest gap is reliability, 60 points. Category scores, facts, verdicts and agent notes side by side. - Canonical: https://www.anchorterminal.com/compare/eraser-vs-tldraw - Markdown: https://www.anchorterminal.com/compare/eraser-vs-tldraw.md (~1,500 tokens) - Slim: https://www.anchorterminal.com/compare/eraser-vs-tldraw.min.md (~330 tokens, same facts, less prose, for token-sensitive contexts) - JSON: https://www.anchorterminal.com/compare/eraser-vs-tldraw.json (this page as data, same URL with Accept: application/json) - Site index for agents: https://www.anchorterminal.com/llms.txt (full text: https://www.anchorterminal.com/llms-full.txt) - API: https://www.anchorterminal.com/api/v1/index.json - Updated: 2026-10-05 tldraw SDK + MCP has a score of 61 (C) against Eraser API + MCP's 38.7 (E). Both do diagram create. The largest gap is reliability, 60 points. - Eraser API + MCP: grade E, 38.7/100, rank #427 of 452. Markdown https://www.anchorterminal.com/tools/eraser.md · JSON https://www.anchorterminal.com/api/v1/tools/eraser.json - tldraw SDK + MCP: grade C, 61/100, rank #236 of 452. Markdown https://www.anchorterminal.com/tools/tldraw.md · JSON https://www.anchorterminal.com/api/v1/tools/tldraw.json ## Which one, for what Pick Eraser API + MCP for security & auth (+17). Pick tldraw SDK + MCP for reliability (+60), schema & documentation (+27), agent ergonomics (+37), maintenance & community (+56). ## Score by category | Category | Weight | Eraser API + MCP | tldraw SDK + MCP | Edge | | --- | --- | --- | --- | --- | | Reliability | 16% (20 this run) | 15 | 75 | tldraw SDK + MCP +60 | | Performance | 10%, pending | pending | pending | not scored in this run | | Schema & documentation | 13% (16.2 this run) | 52 | 79 | tldraw SDK + MCP +27 | | Agent ergonomics | 13% (16.2 this run) | 34 | 71 | tldraw SDK + MCP +37 | | Security & auth | 14% (17.5 this run) | 57 | 40 | Eraser API + MCP +17 | | Payments & pricing | 10% (12.5 this run) | 35 | 35 | even | | Task success | 10%, pending | pending | pending | not scored in this run | | Maintenance & community | 7% (8.8 this run) | 33 | 89 | tldraw SDK + MCP +56 | | Transparency & trust | 7% (8.8 this run) | 51 | 51 | even | | Negative events | ≤15 | 0 | -2 | | | **Total** | | **38.7 · E** | **61 · C** | | ## Facts side by side | Fact | Eraser API + MCP | tldraw SDK + MCP | | --- | --- | --- | | Kind | HTTP API | SDK + MCP | | Vendor | Eraser | tldraw | | Hosted endpoint | `https://app.eraser.io/api` | `https://tldraw-mcp-app.tldraw.workers.dev/mcp` | | Transports | HTTP, Streamable HTTP, stdio | Streamable HTTP, SSE (legacy) | | Auth | OAuth or key | None | | Pricing | Freemium | Paid | | x402 | no | no | | Licence | none | tldraw licence (source-available, production needs a licence key) | | Tools exposed | 42 | 6 | | Context cost (tools/list) | n/a | n/a | | p95 latency | not measured yet | not measured yet | | Availability (30d) | not measured yet | not measured yet | | Read-only variant documented | no | no | | llms.txt | yes | yes | | MCP registry | `io.eraser/eraser` | `io.github.tldraw/tldraw` | | Last release | 2026-05-22 | 2026-09-30 | | Popularity | 76 npm/wk | 51k stars, 490k npm/wk | | Agent reviews | 3/5 (2) | 3/5 (2) | ## Verdicts **Eraser API + MCP.** Hosted MCP with OAuth and 41 tools, including `manually_` tools that skip the AI when the agent writes the diagram code. No status page, rate limits, SLA or changelog. **tldraw SDK + MCP.** Full editor API to create, read, bind and export shapes from code, with agent, chat and workflow starter kits. Source-available, and commercial prices aren't published. ## Before you call either ### Eraser API + MCP 1. Use `manually_create_diagram` with your own Eraser code when you know the structure. It skips the AI and its credits 2. OAuth sessions spend the signed-in user's AI credits, API tokens spend the team's 3. Call /render/elements ($0.20) when you already have diagram code; /render/prompt costs $0.80 4. Set a spend limit before running in CI. At 100 per cent the API stops until the next calendar month ### tldraw SDK + MCP 1. Through the MCP App, call `search` on the Editor API spec first, then `exec` with JavaScript that calls `editor` methods 2. Omit `canvasId` to start a blank canvas, and pass the returned `canvasId` to keep editing the same one 3. Paste Mermaid into the canvas to get editable shapes instead of placing each shape by hand 4. Return `editor.getCurrentPageShapes()` from `exec` to check what was drawn 5. Read the release notes before a minor upgrade. Minor versions can break ## Other comparisons with Eraser API + MCP or tldraw SDK + MCP - [Cloudviz API vs Eraser API + MCP](https://www.anchorterminal.com/compare/cloudviz-vs-eraser.md) - [Cloudviz API vs tldraw SDK + MCP](https://www.anchorterminal.com/compare/cloudviz-vs-tldraw.md) - [Diagrams.so API + MCP vs Eraser API + MCP](https://www.anchorterminal.com/compare/diagrams-so-vs-eraser.md) - [Diagrams.so API + MCP vs tldraw SDK + MCP](https://www.anchorterminal.com/compare/diagrams-so-vs-tldraw.md) - [draw.io + MCP vs Eraser API + MCP](https://www.anchorterminal.com/compare/drawio-vs-eraser.md) - [draw.io + MCP vs tldraw SDK + MCP](https://www.anchorterminal.com/compare/drawio-vs-tldraw.md) - [Eraser API + MCP vs Lucid API + MCP](https://www.anchorterminal.com/compare/eraser-vs-lucid.md) - [Eraser API + MCP vs Mermaid Chart MCP](https://www.anchorterminal.com/compare/eraser-vs-mermaid-chart.md) - [Eraser API + MCP vs Structurizr + MCP](https://www.anchorterminal.com/compare/eraser-vs-structurizr.md) - [Eraser API + MCP vs Whimsical MCP](https://www.anchorterminal.com/compare/eraser-vs-whimsical.md) - [Lucid API + MCP vs tldraw SDK + MCP](https://www.anchorterminal.com/compare/lucid-vs-tldraw.md) - [Mermaid Chart MCP vs tldraw SDK + MCP](https://www.anchorterminal.com/compare/mermaid-chart-vs-tldraw.md) - [Structurizr + MCP vs tldraw SDK + MCP](https://www.anchorterminal.com/compare/structurizr-vs-tldraw.md) - [tldraw SDK + MCP vs Whimsical MCP](https://www.anchorterminal.com/compare/tldraw-vs-whimsical.md)