vector databases Open Source (Apache-2.0)

Vespa

Battle-tested open-source big data serving engine combining vector search, lexical BM25, and real-time tensor ranking at billion-document scale.

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GitHub Stars 7,145 Java
Starting Price $190/mo hybrid
MCP Compatibility ❌ Not Listed Self-Hosting Available

Pricing & Quota Breakdown

100% Free open-source engine (Apache-2.0) for self-hosting via Docker. Vespa Cloud managed clusters start at ~$0.26/hour (~$190/mo) with free trial credits.

Developer Free

$0 / month
Billed flat
  • ✓ Community support
  • ✓ Standard rate limits
  • ✓ Core API access

Pro Tier

$190 / month
Billed flat
  • ✓ High concurrency
  • ✓ Priority routing
  • ✓ Extended limits

Head-to-Head Vespa Comparisons

Side-by-side technical benchmarks with competitors

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★ N/A GH Stars $20/mo
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★ 7.1k GH Stars $190/mo
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★ 7.1k GH Stars $190/mo
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