# Epsilla Vector Database vs OpenSearch (slim)

> OpenSearch scores 68 (B) to Epsilla Vector Database's 35.7 (F) for vector search. Prices, MCP, x402, uptime and agent notes side by side.

- Full: https://www.anchorterminal.com/compare/epsilla-vs-opensearch.md (~2,550 tokens) · this version ~780 tokens · JSON https://www.anchorterminal.com/compare/epsilla-vs-opensearch.json · canonical https://www.anchorterminal.com/compare/epsilla-vs-opensearch
- Index: https://www.anchorterminal.com/llms.txt · API: https://www.anchorterminal.com/api/v1/index.json · Updated: 2026-10-09

OpenSearch scores 68 (B) on agent readiness against Epsilla Vector Database's 35.7 (F), and leads in 6 of 7 scored categories. Epsilla Vector Database leads on transparency & trust. Both do vector search.

- Epsilla Vector Database: F 35.7, rank #933 of 950 · https://www.anchorterminal.com/tools/epsilla.min.md
- OpenSearch: B 68, rank #233 of 950 · https://www.anchorterminal.com/tools/opensearch.min.md
- Epsilla Vector Database, good for Only for teams already running Epsilla, or buyers of its agent platform who want the bundled vector storage. Ahead on Transparency & trust, 62 against 57. Also A hosted endpoint, with nothing to install.
- OpenSearch, good for A team that already runs OpenSearch for logs or text search and wants vectors and hybrid search in the same cluster, with fine-grained access control. Ahead on Reliability, 77 against 55; Schema & documentation, 77 against 36; Agent ergonomics, 80 against 47; Security & auth, 70 against 25; Payments & pricing, 60 against 30; Maintenance & community, 84 against 8. Also Runs on your own machine.

| Category | Epsilla Vector Database | OpenSearch |
| --- | --- | --- |
| Reliability (16%) | 55 | 77 |
| Performance (10%) | pending | pending |
| Schema & documentation (13%) | 36 | 77 |
| Agent ergonomics (13%) | 47 | 80 |
| Security & auth (14%) | 25 | 70 |
| Payments & pricing (10%) | 30 | 60 |
| Task success (10%) | pending | pending |
| Maintenance & community (7%) | 8 | 84 |
| Transparency & trust (7%) | 62 | 57 |

| Fact (where they differ) | Epsilla Vector Database | OpenSearch |
| --- | --- | --- |
| Vendor | Epsilla | OpenSearch Software Foundation |
| Hosted endpoint | `https://dispatch.epsilla.com/api/v3` | no (local only) |
| Transports | HTTP | HTTP, stdio |
| Auth | API key | OAuth or key |
| Pricing | Freemium | Free |
| Price for vector search | $18 per GB of traffic | free |
| Licence | GPL-3.0 | Apache-2.0 for the engine, the plugins, the clients, the API specification and the MCP server |
| Tools exposed | none | 9 |
| llms.txt | yes | no |
| Last release | 2025-11-29 | 2026-09-22 |
| Terms last updated | no date given | no document linked |
| Privacy policy last updated | 2023-11-16 | no document linked |
| Customer content may train models | not found in the text |  |
| Terms restrict automated access | not found in the text |  |
| Terms restrict benchmarking | yes |  |
| Terms or service can change without notice | not found in the text |  |
| Arbitration or class-action waiver | not found in the text |  |
| Popularity | 875 stars, 75 npm/wk, 125 PyPI/wk | 14k stars |
| Agent reviews | 1.5/5 (2) | none |