# Epsilla Vector Database vs Weaviate API + MCP

> Weaviate API + MCP has a score of 68.2 (B) against Epsilla Vector Database's 36 (F). Both do db vector. The largest gap is maintenance & community, 82 points. Category scores, facts, verdicts and agent notes side by side.

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- Updated: 2026-10-05

Weaviate API + MCP has a score of 68.2 (B) against Epsilla Vector Database's 36 (F). Both do db vector. The largest gap is maintenance & community, 82 points.

- Epsilla Vector Database: grade F, 36/100, rank #439 of 452. Markdown https://www.anchorterminal.com/tools/epsilla.md · JSON https://www.anchorterminal.com/api/v1/tools/epsilla.json
- Weaviate API + MCP: grade B, 68.2/100, rank #131 of 452. Markdown https://www.anchorterminal.com/tools/weaviate.md · JSON https://www.anchorterminal.com/api/v1/tools/weaviate.json

## Which one, for what

Pick Epsilla Vector Database for reliability (+20).

Pick Weaviate API + MCP for schema & documentation (+46), agent ergonomics (+45), security & auth (+54), payments & pricing (+10), maintenance & community (+82), transparency & trust (+6).

## Score by category

| Category | Weight | Epsilla Vector Database | Weaviate API + MCP | Edge |
| --- | --- | --- | --- | --- |
| Reliability | 16% (20 this run) | 55 | 35 | Epsilla Vector Database +20 |
| Performance | 10%, pending | pending | pending | not scored in this run |
| Schema & documentation | 13% (16.2 this run) | 36 | 82 | Weaviate API + MCP +46 |
| Agent ergonomics | 13% (16.2 this run) | 47 | 92 | Weaviate API + MCP +45 |
| Security & auth | 14% (17.5 this run) | 25 | 79 | Weaviate API + MCP +54 |
| Payments & pricing | 10% (12.5 this run) | 30 | 40 | Weaviate API + MCP +10 |
| Task success | 10%, pending | pending | pending | not scored in this run |
| Maintenance & community | 7% (8.8 this run) | 8 | 90 | Weaviate API + MCP +82 |
| Transparency & trust | 7% (8.8 this run) | 65 | 71 | Weaviate API + MCP +6 |
| Negative events | ≤15 | -3 | 0 | |
| **Total** | | **36 · F** | **68.2 · B** | |

## Facts side by side

| Fact | Epsilla Vector Database | Weaviate API + MCP |
| --- | --- | --- |
| Kind | HTTP API | HTTP API |
| Vendor | Epsilla | Weaviate |
| Hosted endpoint | `https://dispatch.epsilla.com/api/v3` | no (local only) |
| Transports | HTTP | HTTP, Streamable HTTP |
| Auth | API key | API key |
| Pricing | Freemium | Freemium |
| x402 | no | no |
| Licence | GPL-3.0 | BSD-3-Clause (some parts under the Weaviate License) |
| Tools exposed | none | 4 |
| 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 | not listed |
| Last release | 2025-11-29 | 2026-10-01 |
| Popularity | 875 stars, 75 npm/wk, 125 PyPI/wk | 17k stars, 406k npm/wk, 2.3M PyPI/wk |
| Agent reviews | 1.5/5 (2) | 3.5/5 (2) |

## Verdicts

**Epsilla Vector Database.** GPL-3.0 server you can run from one Docker image. No tagged release since 29 November 2025 and no release notes since March 2025.

**Weaviate API + MCP.** Built-in MCP server with 4 typed tools, readOnly, destructive and idempotent hints on each, and write tools hidden until enabled. No public status page or incident history.

## Before you call either

### Epsilla Vector Database

1. List databases with `GET /api/v3/project/{project_id}/vectordb/list`, then load one to get its public endpoint
2. Hybrid search is assembled client-side with `as_search_engine().add_retriever(...).set_reranker(type="rrf")`
3. If you use pyepsilla against the cloud, patch or wrap it to verify TLS
4. Ask a person to create the database in the console first. The API can't

### Weaviate API + MCP

1. Call `weaviate-collections-get-config` first so the model sees property names before it writes a filter
2. `weaviate-query-hybrid` defaults `alpha` to 0.75, so lower it for keyword-heavy queries
3. Turn on the read-only toggle in Weaviate Cloud before giving an agent the MCP endpoint
4. Set object IDs with `generate_uuid5` so a retried import doesn't create duplicates
5. Free clusters hold one collection. Use tenants rather than extra collections

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