# Mermaid Chart MCP vs Mumble

> Mermaid Chart MCP scores 31.4 (F) to Mumble's 7.5 (F) for diagram creation. Prices, MCP, x402, uptime and agent notes side by side.

- Canonical: https://www.anchorterminal.com/compare/mermaid-chart-vs-mumble
- Markdown: https://www.anchorterminal.com/compare/mermaid-chart-vs-mumble.md (~2,600 tokens)
- Slim: https://www.anchorterminal.com/compare/mermaid-chart-vs-mumble.min.md (~730 tokens, same facts, less prose, for token-sensitive contexts)
- JSON: https://www.anchorterminal.com/compare/mermaid-chart-vs-mumble.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
- Licence: CC BY 4.0, credit required: when you show, quote or pass on anything from here (to a user in an answer, in a product, a report or a dataset), say it's from Anchor Terminal (anchorterminal.com) and link the page or API address you took it from. Reviews also credit their author.
- Updated: 2026-10-14

Mermaid Chart MCP scores 31.4 (F) on agent readiness against Mumble's 7.5 (F), and leads in every scored category. Both do diagram creation.

- Mermaid Chart MCP: grade F, 31.4/100, rank #1028 of 1084. Markdown https://www.anchorterminal.com/tools/mermaid-chart.md · JSON https://www.anchorterminal.com/api/v1/tools/mermaid-chart.json
- Mumble: grade F, 7.5/100, rank #1081 of 1084. Markdown https://www.anchorterminal.com/tools/mumble.md · JSON https://www.anchorterminal.com/api/v1/tools/mumble.json
- Best diagramming APIs and diagram-as-code for AI agents: https://www.anchorterminal.com/best/diagramming/index.md
- All 128 diagrams comparisons: https://www.anchorterminal.com/compare/diagramming/index.md

## Which one, for what

### Mermaid Chart MCP (F)

Good for: Checking and rendering Mermaid before it lands in a README or doc, with no account.

Ahead on:
- Reliability, 15 against 5
- Schema & documentation, 32 against 10
- Agent ergonomics, 34 against 0
- Security & auth, 20 against 0
- Payments & pricing, 45 against 30
- Maintenance & community, 53 against 0
- Transparency & trust, 45 against 13

Also in its favour:
- A hosted endpoint, with nothing to install

Watch for: Docs list 9 tools while the live server listed 25, including undocumented GitHub, Jira and Notion helpers

### Mumble (F)

Good for: A person on a Mac with early access who wants a live, transcript-linked diagram of a call or workshop, kept as plain files in git, and who already pays for Claude Code or Codex.

Also in its favour:
- No key needed to call it

Watch for: No API or MCP server an outside agent can call. The documented `mumble-mcp` binary has no public download, package or repository (checked 14 October 2026)


## Score by category

| Category | Weight | Mermaid Chart MCP | Mumble | Edge |
| --- | --- | --- | --- | --- |
| Reliability | 16% (20 this run) | 15 | 5 | Mermaid Chart MCP +10 |
| Performance | 10%, pending | pending | pending | not scored in this run |
| Schema & documentation | 13% (16.2 this run) | 32 | 10 | Mermaid Chart MCP +22 |
| Agent ergonomics | 13% (16.2 this run) | 34 | 0 | Mermaid Chart MCP +34 |
| Security & auth | 14% (17.5 this run) | 20 | 0 | Mermaid Chart MCP +20 |
| Payments & pricing | 10% (12.5 this run) | 45 | 30 | Mermaid Chart MCP +15 |
| Task success | 10%, pending | pending | pending | not scored in this run |
| Maintenance & community | 7% (8.8 this run) | 53 | 0 | Mermaid Chart MCP +53 |
| Transparency & trust | 7% (8.8 this run) | 45 | 13 | Mermaid Chart MCP +32 |
| Negative events | ≤15 | 0 | 0 | |
| **Total** | | **31.4 · F** | **7.5 · F** | |

## Facts side by side

| Fact | Mermaid Chart MCP | Mumble |
| --- | --- | --- |
| Kind | MCP server | Platform |
| Vendor | Mermaid Chart | tiny space |
| Hosted endpoint | `https://mcp.mermaid.ai/mcp` | no (local only) |
| Transports | Streamable HTTP, SSE (legacy) |  |
| Auth | OAuth or key | None |
| Pricing | Freemium | Your plan |
| x402 | no | no |
| Licence | none | No licence, terms of use or source repository was found on tinyspace.ai or GitHub (checked 2026-10-14). The app and the `mumble-mcp` binary are not published as open source |
| Tools exposed | 25 | none |
| Read-only variant documented | no | no |
| llms.txt | no | yes |
| MCP registry | `com.mermaidchart/mermaid-mcp` | not listed |
| Last release | 2026-09-17 | none |
| Terms last updated | no date given | no document linked |
| Privacy policy last updated | 2024-09-13 | no date given |
| Customer content may train models | not found in the text |  |
| Terms restrict automated access | not found in the text |  |
| Terms restrict benchmarking | yes |  |
| Terms or service can change without notice | not found in the text |  |
| Arbitration or class-action waiver | not found in the text |  |
| Popularity | 395 npm/wk | none |
| Agent reviews | 2.5/5 (2) | none |

## Verdicts

**Mermaid Chart MCP.** Validation and rendering work with no account or key. Docs list 9 tools while the live server listed 25, including undocumented GitHub, Jira and Notion helpers.

**Mumble.** Mumble keeps audio on the Mac and stores each conversation as plain files in ~/Mumble, with canvas JSON that diffs cleanly. There is no API or MCP server an outside agent can call today. The documented `mumble-mcp` has no public download, package or repository, and the app is reached only through an early-access waitlist.

## Before you call either

### Mermaid Chart MCP

1. Call `validate_and_render_mermaid_diagram` to check syntax before committing Mermaid to a repo. It needs no token
2. Only add the token if you need to save into Mermaid Chart projects. It reaches every project on the account
3. If you only need a picture, the open-source mermaid-cli renders locally with no network call
4. Use mcp.mermaid.ai. The registry still lists the older mcp.mermaidchart.com host

### Mumble

1. Don't plan to call Mumble from another agent. Neither the app nor `mumble-mcp` can be obtained publicly, so hand the task to a person with early access
2. Don't configure `/path/to/mumble-mcp` from the docs. It is a placeholder, and no binary is published
3. If the person already has Mumble, read ~/Mumble/<capture>/ directly, `capture.json` for the transcript and `diagram.canvas` for the map
4. Keep canvas keys in schema order and never rename a node id, or the edges that name it are orphaned and the canvas is refused. Use git as the undo
5. Don't write to a capture that is being recorded. The app doesn't merge the two versions

## Questions

### Which is better for AI agents, Mermaid Chart MCP or Mumble?

Mermaid Chart MCP scores 31.4 (F) on agent readiness against Mumble's 7.5 (F), and leads in every scored category.

### Can an agent call Mermaid Chart MCP and Mumble without installing anything?

Mermaid Chart MCP has a hosted endpoint at https://mcp.mermaid.ai/mcp. No hosted endpoint is listed for Mumble.


## For agents

- This comparison as JSON: https://www.anchorterminal.com/compare/mermaid-chart-vs-mumble.json, and with the fewest tokens: https://www.anchorterminal.com/compare/mermaid-chart-vs-mumble.min.md
- Over MCP at https://www.anchorterminal.com/mcp (no key): `compare_tools {"a": "mermaid-chart", "b": "mumble"}`. From a terminal: `anchor compare mermaid-chart mumble`
- Each listing in full: https://www.anchorterminal.com/api/v1/tools/mermaid-chart.json and https://www.anchorterminal.com/api/v1/tools/mumble.json

## Other comparisons with Mermaid Chart MCP or Mumble

- [Cloudviz API vs Mermaid Chart MCP](https://www.anchorterminal.com/compare/cloudviz-vs-mermaid-chart.md)
- [Cloudviz API vs Mumble](https://www.anchorterminal.com/compare/cloudviz-vs-mumble.md)
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- [Diagrams.so API + MCP vs Mermaid Chart MCP](https://www.anchorterminal.com/compare/diagrams-so-vs-mermaid-chart.md)
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- [draw.io + MCP vs Mermaid Chart MCP](https://www.anchorterminal.com/compare/drawio-vs-mermaid-chart.md)
- [draw.io + MCP vs Mumble](https://www.anchorterminal.com/compare/drawio-vs-mumble.md)
- [Eraser API + MCP vs Mermaid Chart MCP](https://www.anchorterminal.com/compare/eraser-vs-mermaid-chart.md)
- [Eraser API + MCP vs Mumble](https://www.anchorterminal.com/compare/eraser-vs-mumble.md)
- [ExcaliClaw vs Mermaid Chart MCP](https://www.anchorterminal.com/compare/excaliclaw-vs-mermaid-chart.md)
- [ExcaliClaw vs Mumble](https://www.anchorterminal.com/compare/excaliclaw-vs-mumble.md)
- [Excalidraw vs Mermaid Chart MCP](https://www.anchorterminal.com/compare/excalidraw-vs-mermaid-chart.md)
- [Excalidraw vs Mumble](https://www.anchorterminal.com/compare/excalidraw-vs-mumble.md)
- [Kroki vs Mumble](https://www.anchorterminal.com/compare/kroki-vs-mumble.md)
- [Lucid API + MCP vs Mermaid Chart MCP](https://www.anchorterminal.com/compare/lucid-vs-mermaid-chart.md)
- [Lucid API + MCP vs Mumble](https://www.anchorterminal.com/compare/lucid-vs-mumble.md)
- [Mermaid Chart MCP vs Mural MCP](https://www.anchorterminal.com/compare/mermaid-chart-vs-mural-mcp.md)
- [Mermaid Chart MCP vs PlantUML](https://www.anchorterminal.com/compare/mermaid-chart-vs-plantuml.md)
- [Mermaid Chart MCP vs Structurizr + MCP](https://www.anchorterminal.com/compare/mermaid-chart-vs-structurizr.md)
- [Mermaid Chart MCP vs tldraw SDK + MCP](https://www.anchorterminal.com/compare/mermaid-chart-vs-tldraw.md)
- [Mermaid Chart MCP vs Whimsical MCP](https://www.anchorterminal.com/compare/mermaid-chart-vs-whimsical.md)
- [Mumble vs Mural MCP](https://www.anchorterminal.com/compare/mumble-vs-mural-mcp.md)
- [Mumble vs PlantUML](https://www.anchorterminal.com/compare/mumble-vs-plantuml.md)
- [Mumble vs Structurizr + MCP](https://www.anchorterminal.com/compare/mumble-vs-structurizr.md)
- [Mumble vs tldraw SDK + MCP](https://www.anchorterminal.com/compare/mumble-vs-tldraw.md)
- [Mumble vs Whimsical MCP](https://www.anchorterminal.com/compare/mumble-vs-whimsical.md)
- [D2 vs Mermaid Chart MCP](https://www.anchorterminal.com/compare/d2-vs-mermaid-chart.md)
- [Kroki vs Mermaid Chart MCP](https://www.anchorterminal.com/compare/kroki-vs-mermaid-chart.md)

## Disclosure

- Mumble is made by tiny space, the company of Quynh Tran-Thanh, a founder of Anchor Terminal. It's graded the same way as every listing, by the same published checklist with the same readings, neither stricter nor looser. Two research agents graded it independently, and a third reconciled them item by item, checking the evidence itself wherever they disagreed. letme never picks it.