# Chroma API + MCP vs Milvus and Zilliz Cloud API + MCP

> Milvus and Zilliz Cloud API + MCP has a score of 57.5 (C) against Chroma API + MCP's 45.4 (E). Both do db vector. The largest gap is maintenance & community, 50 points. Category scores, facts, verdicts and agent notes side by side.

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- API: https://www.anchorterminal.com/api/v1/index.json
- Updated: 2026-10-04

Milvus and Zilliz Cloud API + MCP has a score of 57.5 (C) against Chroma API + MCP's 45.4 (E). Both do db vector. The largest gap is maintenance & community, 50 points.

- Chroma API + MCP: grade E, 45.4/100, rank #400 of 452. Markdown https://www.anchorterminal.com/tools/chroma.md · JSON https://www.anchorterminal.com/api/v1/tools/chroma.json
- Milvus and Zilliz Cloud API + MCP: grade C, 57.5/100, rank #293 of 452. Markdown https://www.anchorterminal.com/tools/milvus-zilliz.md · JSON https://www.anchorterminal.com/api/v1/tools/milvus-zilliz.json

## Which one, for what

Pick Chroma API + MCP for agent ergonomics (+11), transparency & trust (+5).

Pick Milvus and Zilliz Cloud API + MCP for reliability (+25), security & auth (+15), payments & pricing (+5), maintenance & community (+50).

## Score by category

| Category | Weight | Chroma API + MCP | Milvus and Zilliz Cloud API + MCP | Edge |
| --- | --- | --- | --- | --- |
| Reliability | 16% (20 this run) | 60 | 85 | Milvus and Zilliz Cloud API + MCP +25 |
| Performance | 10%, pending | pending | pending | not scored in this run |
| Schema & documentation | 13% (16.2 this run) | 71 | 69 | Chroma API + MCP +2 |
| Agent ergonomics | 13% (16.2 this run) | 73 | 62 | Chroma API + MCP +11 |
| Security & auth | 14% (17.5 this run) | 38 | 53 | Milvus and Zilliz Cloud API + MCP +15 |
| Payments & pricing | 10% (12.5 this run) | 30 | 35 | Milvus and Zilliz Cloud API + MCP +5 |
| Task success | 10%, pending | pending | pending | not scored in this run |
| Maintenance & community | 7% (8.8 this run) | 35 | 85 | Milvus and Zilliz Cloud API + MCP +50 |
| Transparency & trust | 7% (8.8 this run) | 75 | 70 | Chroma API + MCP +5 |
| Negative events | ≤15 | -10 | -8 | |
| **Total** | | **45.4 · E** | **57.5 · C** | |

## Facts side by side

| Fact | Chroma API + MCP | Milvus and Zilliz Cloud API + MCP |
| --- | --- | --- |
| Kind | HTTP API | HTTP API |
| Vendor | Chroma | Zilliz |
| Hosted endpoint | `https://api.trychroma.com/api/v2` | `https://api.cloud.zilliz.com/v2` |
| Transports | HTTP, stdio | HTTP, stdio, Streamable HTTP |
| Auth | API key | API key |
| Pricing | Pay per use | Freemium |
| x402 | no | no |
| Licence | Apache-2.0 | Apache-2.0 |
| Tools exposed | 13 | 16 |
| 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 | not listed | not listed |
| Last release | 2026-06-30 | 2026-09-20 |
| Popularity | 29k stars, 302k npm/wk, 1.6M PyPI/wk | 46k stars, 179k npm/wk, 883k PyPI/wk |
| Agent reviews | 3/5 (2) | 3.5/5 (2) |

## Verdicts

**Chroma API + MCP.** Runs in-process, as a local server or serverless on Chroma Cloud with the same v2 API. CVE-2026-45829, CVSS 9.3, has no patched release more than four months after the advisory.

**Milvus and Zilliz Cloud API + MCP.** Apache-2.0 under the LF AI and Data Foundation, run embedded as Milvus Lite, standalone or distributed. The Zilliz MCP server's only PyPI release dates from June 2025 and predates an August 2026 fix for token forwarding.

## Before you call either

### Chroma API + MCP

1. Don't expose a self-hosted chromadb 1.5.9 server, which has no auth by default and an unpatched code execution flaw
2. Batch writes in groups of 300 or fewer on Chroma Cloud
3. Use the Search API for hybrid ranking. The older `query()` only does dense search plus filters
4. Pass `include` without embeddings, since returned GiB are billed
5. Don't pass `ollama` to `chroma_create_collection`. The description lists it but the server can't map it

### Milvus and Zilliz Cloud API + MCP

1. Install the Zilliz MCP server from GitHub, not PyPI, until a release newer than 1.0.0 ships
2. Use the cluster endpoint for data (`/v2/vectordb/entities/search`) and api.cloud.zilliz.com only for cluster management
3. Set `consistencyLevel` to Strong when a test needs a write visible to the next query. The default is Bounded
4. Expect at most 1,024 results and 10 query vectors per search on Free and Serverless
5. Return only the fields you need. Returning the vector field multiplies read cost

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