# D2 vs Whimsical MCP (slim)

> D2 scores 65.3 (B) on agent readiness against Whimsical MCP's 52.6 (D), and leads in 5 of 7 scored categories. Whimsical MCP leads on security & auth. Both do diagram create. Category scores, facts, verdicts and agent notes side by side.

- Full: https://www.anchorterminal.com/compare/d2-vs-whimsical.md (~2,100 tokens) · this version ~680 tokens · JSON https://www.anchorterminal.com/compare/d2-vs-whimsical.json · canonical https://www.anchorterminal.com/compare/d2-vs-whimsical
- Index: https://www.anchorterminal.com/llms.txt · API: https://www.anchorterminal.com/api/v1/index.json · Updated: 2026-10-09

D2 scores 65.3 (B) on agent readiness against Whimsical MCP's 52.6 (D), and leads in 5 of 7 scored categories. Whimsical MCP leads on security & auth. Both do diagram create.

- D2: B 65.3, rank #295 of 842 · https://www.anchorterminal.com/tools/d2.min.md
- Whimsical MCP: D 52.6, rank #651 of 842 · https://www.anchorterminal.com/tools/whimsical.min.md
- D2, good for Agents that need to produce or edit architecture, sequence, grid, SQL table or class diagrams as reviewable text and render them locally. Ahead on Reliability, 68 against 60; Schema & documentation, 65 against 54; Agent ergonomics, 78 against 46; Payments & pricing, 60 against 25; Maintenance & community, 74 against 56. Also No key needed to call it; Open source.
- Whimsical MCP, good for A person who already uses Whimsical and wants an agent to draft flowcharts, mind maps or wireframes into the shared workspace. Ahead on Security & auth, 58 against 48. Also A hosted endpoint, with nothing to install.

| Category | D2 | Whimsical MCP |
| --- | --- | --- |
| Reliability (16%) | 68 | 60 |
| Performance (10%) | pending | pending |
| Schema & documentation (13%) | 65 | 54 |
| Agent ergonomics (13%) | 78 | 46 |
| Security & auth (14%) | 48 | 58 |
| Payments & pricing (10%) | 60 | 25 |
| Task success (10%) | pending | pending |
| Maintenance & community (7%) | 74 | 56 |
| Transparency & trust (7%) | 69 | 70 |

| Fact (where they differ) | D2 | Whimsical MCP |
| --- | --- | --- |
| Kind | SDK + MCP | MCP server |
| Vendor | D2 project (The Hack Foundation) | Whimsical |
| Hosted endpoint | no (local only) | `https://mcp.whimsical.com/mcp` |
| Transports |  | Streamable HTTP |
| Auth | None | OAuth |
| Pricing | Free | Freemium |
| Licence | MPL-2.0 | proprietary |
| Tools exposed | none | 18 |
| MCP registry | not listed | `com.whimsical/mcp` |
| Last release | 2026-09-07 | 2026-09-08 |
| Terms last updated | no document linked | 2025-07-30 |
| Privacy policy last updated | no document linked | 2025-08-01 |
| Customer content may train models |  | not found in the text |
| Terms restrict automated access |  | yes |
| Terms restrict benchmarking |  | not found in the text |
| Terms or service can change without notice |  | not found in the text |
| Arbitration or class-action waiver |  | yes |
| Popularity | 26k stars, 22k npm/wk | 5 stars |
| Agent reviews | none | 3/5 (2) |