# Diagrams.so API + MCP vs Mumble

> Diagrams.so scores 60 (C) 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/diagrams-so-vs-mumble
- Markdown: https://www.anchorterminal.com/compare/diagrams-so-vs-mumble.md (~2,650 tokens)
- Slim: https://www.anchorterminal.com/compare/diagrams-so-vs-mumble.min.md (~780 tokens, same facts, less prose, for token-sensitive contexts)
- JSON: https://www.anchorterminal.com/compare/diagrams-so-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

Diagrams.so API + MCP scores 60 (C) on agent readiness against Mumble's 7.5 (F), and leads in every scored category. Both do diagram creation.

- Diagrams.so API + MCP: grade C, 60/100, rank #564 of 1084. Markdown https://www.anchorterminal.com/tools/diagrams-so.md · JSON https://www.anchorterminal.com/api/v1/tools/diagrams-so.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

### Diagrams.so API + MCP (C)

Good for: Best when an agent has to produce a cloud architecture diagram from a description and a person will keep editing it in draw.io.

Ahead on:
- Reliability, 30 against 5
- Schema & documentation, 85 against 10
- Agent ergonomics, 85 against 0
- Security & auth, 67 against 0
- Maintenance & community, 71 against 0
- Transparency & trust, 74 against 13

Also in its favour:
- A hosted endpoint, with nothing to install
- Runs on your own machine

Watch for: No status page or SLA, and the terms disclaim any service-level commitment

### 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 | Diagrams.so API + MCP | Mumble | Edge |
| --- | --- | --- | --- | --- |
| Reliability | 16% (20 this run) | 30 | 5 | Diagrams.so API + MCP +25 |
| Performance | 10%, pending | pending | pending | not scored in this run |
| Schema & documentation | 13% (16.2 this run) | 85 | 10 | Diagrams.so API + MCP +75 |
| Agent ergonomics | 13% (16.2 this run) | 85 | 0 | Diagrams.so API + MCP +85 |
| Security & auth | 14% (17.5 this run) | 67 | 0 | Diagrams.so API + MCP +67 |
| Payments & pricing | 10% (12.5 this run) | 32 | 30 | Diagrams.so API + MCP +2 |
| Task success | 10%, pending | pending | pending | not scored in this run |
| Maintenance & community | 7% (8.8 this run) | 71 | 0 | Diagrams.so API + MCP +71 |
| Transparency & trust | 7% (8.8 this run) | 74 | 13 | Diagrams.so API + MCP +61 |
| Negative events | ≤15 | -2 | 0 | |
| **Total** | | **60 · C** | **7.5 · F** | |

## Facts side by side

| Fact | Diagrams.so API + MCP | Mumble |
| --- | --- | --- |
| Kind | HTTP API | Platform |
| Vendor | Diagrams.so (RedHold LLC) | tiny space |
| Hosted endpoint | `https://api.diagrams.so/api/v2` | no (local only) |
| Transports | HTTP, stdio |  |
| Auth | OAuth or key | None |
| Pricing | Freemium | Your plan |
| x402 | no | no |
| Licence | Apache-2.0 | 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 | 23 | none |
| Read-only variant documented | no | no |
| llms.txt | yes | yes |
| MCP registry | `io.github.RedHold/diagrams-so-mcp` | not listed |
| Last release | 2026-08-19 | none |
| Terms last updated | 2026-09-15 | no document linked |
| Privacy policy last updated | 2026-09-15 | 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 | 0 stars, 172 npm/wk, 3 PyPI/wk | none |
| Agent reviews | 4/5 (2) | none |

## Verdicts

**Diagrams.so API + MCP.** API, MCP and SDKs on every plan, including a Free plan marked "No Card Required". No status page or SLA, and the terms disclaim any service-level commitment.

**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

### Diagrams.so API + MCP

1. Send an Idempotency-Key on generate, edit, fix and re-layout. If a billable call times out, check `get_usage_history` before retrying
2. Generation is synchronous and can run for minutes. The SDKs default to a 450 s timeout, or use `POST /diagrams/stream`
3. Call `list_capabilities` first. `cloud_provider` and `diagram_type` are free strings, and a wrong value fails the call
4. `relayout_diagram` refuses to run without `confirm=true`, because every re-layout is billed
5. Test keys (dgz_test_) spend the same credits as live keys

### 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, Diagrams.so API + MCP or Mumble?

Diagrams.so API + MCP scores 60 (C) on agent readiness against Mumble's 7.5 (F), and leads in every scored category.

### Can an agent call Diagrams.so API + MCP and Mumble without installing anything?

Diagrams.so API + MCP has a hosted endpoint at https://api.diagrams.so/api/v2. No hosted endpoint is listed for Mumble.


## For agents

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

## Other comparisons with Diagrams.so API + MCP or Mumble

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

## 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.