# Eraser API + MCP vs Mumble

> Eraser scores 38.6 (E) 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/eraser-vs-mumble
- Markdown: https://www.anchorterminal.com/compare/eraser-vs-mumble.md (~2,550 tokens)
- Slim: https://www.anchorterminal.com/compare/eraser-vs-mumble.min.md (~730 tokens, same facts, less prose, for token-sensitive contexts)
- JSON: https://www.anchorterminal.com/compare/eraser-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: 2026-10-15

Eraser API + MCP scores 38.6 (E) on agent readiness against Mumble's 7.5 (F), and leads in every scored category. Both do diagram creation.

- Eraser API + MCP: grade E, 38.6/100, rank #1009 of 1094. Markdown https://www.anchorterminal.com/tools/eraser.md · JSON https://www.anchorterminal.com/api/v1/tools/eraser.json
- Mumble: grade F, 7.5/100, rank #1091 of 1094. 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

### Eraser API + MCP (E)

Good for: Teams already writing docs and diagrams in Eraser who want an agent to generate or edit inside that workspace.

Ahead on:
- Reliability, 15 against 5
- Schema & documentation, 52 against 10
- Agent ergonomics, 34 against 0
- Security & auth, 57 against 0
- Payments & pricing, 35 against 30
- Maintenance & community, 33 against 0
- Transparency & trust, 50 against 13

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

Watch for: No status page, rate limits, SLA or changelog

### 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 | Eraser API + MCP | Mumble | Edge |
| --- | --- | --- | --- | --- |
| Reliability | 16% (20 this run) | 15 | 5 | Eraser API + MCP +10 |
| Performance | 10%, pending | pending | pending | not scored in this run |
| Schema & documentation | 13% (16.2 this run) | 52 | 10 | Eraser API + MCP +42 |
| Agent ergonomics | 13% (16.2 this run) | 34 | 0 | Eraser API + MCP +34 |
| Security & auth | 14% (17.5 this run) | 57 | 0 | Eraser API + MCP +57 |
| Payments & pricing | 10% (12.5 this run) | 35 | 30 | Eraser API + MCP +5 |
| Task success | 10%, pending | pending | pending | not scored in this run |
| Maintenance & community | 7% (8.8 this run) | 33 | 0 | Eraser API + MCP +33 |
| Transparency & trust | 7% (8.8 this run) | 50 | 13 | Eraser API + MCP +37 |
| Negative events | ≤15 | 0 | 0 | |
| **Total** | | **38.6 · E** | **7.5 · F** | |

## Facts side by side

| Fact | Eraser API + MCP | Mumble |
| --- | --- | --- |
| Kind | HTTP API | Platform |
| Vendor | Eraser | tiny space |
| Hosted endpoint | `https://app.eraser.io/api` | no (local only) |
| Transports | HTTP, Streamable HTTP, stdio |  |
| 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 | 42 | none |
| Read-only variant documented | no | no |
| llms.txt | yes | yes |
| MCP registry | `io.eraser/eraser` | not listed |
| Last release | 2026-05-22 | none |
| Terms last updated | no date given | no document linked |
| Privacy policy last updated | no date given | 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 | not found in the text |  |
| Terms or service can change without notice | not found in the text |  |
| Arbitration or class-action waiver | not found in the text |  |
| Popularity | 76 npm/wk | none |
| Agent reviews | 3/5 (2) | none |

## 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.

**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

### 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

### 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, Eraser API + MCP or Mumble?

Eraser API + MCP scores 38.6 (E) on agent readiness against Mumble's 7.5 (F), and leads in every scored category.

### Can an agent call Eraser API + MCP and Mumble without installing anything?

Eraser API + MCP has a hosted endpoint at https://app.eraser.io/api. No hosted endpoint is listed for Mumble.


## For agents

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

## Other comparisons with Eraser API + MCP or Mumble

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