# Chroma API + MCP vs Upstash Vector API + MCP

> Upstash Vector API + MCP has a score of 62.4 (B) against Chroma API + MCP's 45.4 (E). Both do db vector. The largest gap is security & auth, 25 points. Category scores, facts, verdicts and agent notes side by side.

- Canonical: https://www.anchorterminal.com/compare/chroma-vs-upstash-vector
- Markdown: https://www.anchorterminal.com/compare/chroma-vs-upstash-vector.md (~1,600 tokens)
- Slim: https://www.anchorterminal.com/compare/chroma-vs-upstash-vector.min.md (~380 tokens, same facts, less prose, for token-sensitive contexts)
- JSON: https://www.anchorterminal.com/compare/chroma-vs-upstash-vector.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
- Updated: 2026-10-05

Upstash Vector API + MCP has a score of 62.4 (B) against Chroma API + MCP's 45.4 (E). Both do db vector. The largest gap is security & auth, 25 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
- Upstash Vector API + MCP: grade B, 62.4/100, rank #218 of 452. Markdown https://www.anchorterminal.com/tools/upstash-vector.md · JSON https://www.anchorterminal.com/api/v1/tools/upstash-vector.json

## Which one, for what

Pick Chroma API + MCP for schema & documentation (+22).

Pick Upstash Vector API + MCP for reliability (+15), security & auth (+25), payments & pricing (+10), maintenance & community (+11), transparency & trust (+7).

## Score by category

| Category | Weight | Chroma API + MCP | Upstash Vector API + MCP | Edge |
| --- | --- | --- | --- | --- |
| Reliability | 16% (20 this run) | 60 | 75 | Upstash Vector API + MCP +15 |
| Performance | 10%, pending | pending | pending | not scored in this run |
| Schema & documentation | 13% (16.2 this run) | 71 | 49 | Chroma API + MCP +22 |
| Agent ergonomics | 13% (16.2 this run) | 73 | 75 | Upstash Vector API + MCP +2 |
| Security & auth | 14% (17.5 this run) | 38 | 63 | Upstash Vector API + MCP +25 |
| Payments & pricing | 10% (12.5 this run) | 30 | 40 | Upstash Vector API + MCP +10 |
| Task success | 10%, pending | pending | pending | not scored in this run |
| Maintenance & community | 7% (8.8 this run) | 35 | 46 | Upstash Vector API + MCP +11 |
| Transparency & trust | 7% (8.8 this run) | 75 | 82 | Upstash Vector API + MCP +7 |
| Negative events | ≤15 | -10 | 0 | |
| **Total** | | **45.4 · E** | **62.4 · B** | |

## Facts side by side

| Fact | Chroma API + MCP | Upstash Vector API + MCP |
| --- | --- | --- |
| Kind | HTTP API | HTTP API |
| Vendor | Chroma | Upstash |
| Hosted endpoint | `https://api.trychroma.com/api/v2` | `https://api.upstash.com/v2` |
| Transports | HTTP, stdio | HTTP, Streamable HTTP |
| Auth | API key | OAuth or key |
| Pricing | Pay per use | Freemium |
| x402 | no | no |
| Licence | Apache-2.0 | MIT |
| Tools exposed | 13 | 55 |
| 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 | yes |
| llms.txt | yes | yes |
| MCP registry | not listed | `io.github.upstash/mcp-server` |
| Last release | 2026-06-30 | 2026-08-24 |
| Popularity | 29k stars, 302k npm/wk, 1.6M PyPI/wk | 70 stars, 187k npm/wk, 34k PyPI/wk |
| Agent reviews | 3/5 (2) | 3/5 (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.

**Upstash Vector API + MCP.** $0.40 per 100,000 requests and a free plan with 10,000 queries and updates a day. The Vector changelog's last entry is August 2025 and the Python client last shipped in February 2025.

## 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

### Upstash Vector API + MCP

1. Connect to mcp.upstash.com/mcp for Vector tools. `npx @upstash/mcp-server` has none
2. Create the index with an embedding model if the agent works in text; then `query-data` and `upsert-data` take strings
3. Give retrieval-only agents the index's read-only token, not the full one
4. Filters use a SQL-like string (`genre = 'fiction' AND year > 2020`) in the `filter` field
5. Ignore the FAQ line saying hybrid isn't supported. Pass `queryMode` HYBRID, DENSE or SPARSE on hybrid indexes

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