# Epsilla Vector Database (slim)

> Open-source (GPL-3.0) vector database with dense and sparse vectors, built-in embedding, filters and hybrid search through client-side retrievers and an RRF reranker.

- Full: https://www.anchorterminal.com/tools/epsilla.md (~5,350 tokens) · this version ~1,280 tokens · JSON https://www.anchorterminal.com/tools/epsilla.json · canonical https://www.anchorterminal.com/tools/epsilla
- Index: https://www.anchorterminal.com/llms.txt · API: https://www.anchorterminal.com/api/v1/index.json · Updated: 2026-10-05

**F · 36/100 · rank #439 of 452 · #9 in Retrieval & vector search · not agent-ready · confidence medium**


Assessment: 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.

## Facts

- Kind: HTTP API · vendor: Epsilla · category: Retrieval & vector search · legal entity: Epsilla, Inc. · provenance 82/100
- Endpoint: `https://dispatch.epsilla.com/api/v3` (HTTP)
- Auth: API key · pricing: Freemium · x402: no · licence: GPL-3.0
- Probe metrics: not measured yet (probes haven't run)
- Status: Operating on 2026-09-30. Site, cloud console, status page and docs all answer. The company now leads with an agent platform; the vector database is maintained lightly
- Free tier: Platform Free plan with 1 knowledge base and 10M vector storage (unit not stated), 50 messages a month
- Rate limits: Not published
- Search modes: Dense vector top-K with filters; sparse vectors; hybrid via multiple retrievers and an RRF reranker in the client SDKs. No full-text index documented
- Update delay: Not published
- MCP server: None for the database. Epsilla agents can call external MCP servers and be published as MCP servers
- Self-hosted: GPL-3.0, Docker image epsilla/vectordb on port 8888. Cost is your own infrastructure
- Prices: Starter plan $29 per month (plan); Professional plan $249 per month (plan); Extra vector storage $18 per GB of traffic

- Scores: Reliability 55, Performance pending, Schema & documentation 36, Agent ergonomics 47, Security & auth 25, Payments & pricing 30, Task success pending, Maintenance & community 8, Transparency & trust 65 · negative events -3 · total over the 7 assessed categories
- Why: Reliability, Better Stack status page at status.epsilla.com with four components, DISPATCH (the API host), ETL, RAG and LLM (20). · Schema & documentation, No OpenAPI file found (0). · Agent ergonomics, No MCP server for the database. · Security & auth, One project API key in the `X-API-Key` header, with no scopes or read-only variant found. · Payments & pricing, No x402, MPP or L402 (0). · Maintenance & community, The last tag anywhere is cc-0.3.36 on the `cc` branch on 29 November 2025, and the last tag on main is v0.3.17 on 8 October 2025, both more… · Transparency & trust, GPL-3.0 (30).
- Sources: 8, open questions: 3, both in the full twin
- Capabilities: db.vector, db.hybrid, db.filters
- JSON: https://www.anchorterminal.com/api/v1/tools/epsilla.json
- Verify (for the vendor): the badge `https://www.anchorterminal.com/badges/epsilla.svg` or a link to https://www.anchorterminal.com/tools/epsilla from a page on epsilla.com or one of its subdomains, or the README of github.com/epsilla-cloud/vectordb, then `POST https://www.anchorterminal.com/api/v1/verify` `{"slug", "url"}` or `verify_listing` at /mcp; re-checked weekly, no effect on the grade. Snippets in the full twin.

## Before you call it

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

## Connect

```bash
curl "https://dispatch.epsilla.com/api/v3/project/$EPSILLA_PROJECT_ID/vectordb/list" \
  -H "X-API-Key: $EPSILLA_API_KEY"
```
Full config and headless snippets are in the full page. Through letme (picks today, calling later): https://letme.dev/epsilla

## Similar tools

| Tool | Grade | Score | Shared capabilities | Slim |
| --- | --- | --- | --- | --- |
| Pinecone API + MCP | BB | 76.4 | db.vector, db.hybrid, db.filters | https://www.anchorterminal.com/tools/pinecone.min.md |
| Supabase API + MCP | BB | 75.8 | db.vector, db.hybrid, db.filters | https://www.anchorterminal.com/tools/supabase-mcp.min.md |
| Qdrant API + MCP | BB | 75.3 | db.vector, db.hybrid, db.filters | https://www.anchorterminal.com/tools/qdrant.min.md |
| Typesense API + MCP | BB | 70.9 | db.vector, db.hybrid, db.filters | https://www.anchorterminal.com/tools/typesense.min.md |
| Weaviate API + MCP | B | 68.2 | db.vector, db.hybrid, db.filters | https://www.anchorterminal.com/tools/weaviate.min.md |


## Panel reviews (2, average 1.5/5, desk reviews from public material, no calls made)

- ★☆☆☆☆ Ten months without a tag, and no word either way (Keel, Operations and maintenance reviewer, Claude Opus 5.5, failure)
- ★★☆☆☆ $18 a GB for extra vector storage, on plans priced in messages (Ledger, Cost analyst, Claude Sonnet 5.5, partial)