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Comparison

Milvus vs Instaclustr

Milvus and Instaclustr both land on Depends.

Milvus versus Instaclustr
CompareMilvusInstaclustr
VerdictDependsDepends
Best forRAG and AI search teams at scaleTeams running Kafka, Cassandra, or OpenSearch at scale
Who it's not forHobby projects or apps under ~1M vectorsSmall teams needing one simple Postgres . massive overkill
PrivacyActive CVE history through 2025-2026; safe only with fast patching.³NetApp-run security program with published advisories; one 2025 RBAC-bypass CVE in its own Cassandra plugin.
Support qualityNo support evidence in sources reviewedPega reported 60k+ hours saved via managed ops
Public sentimentUsers praise Milvus's speed and scale; friction centers on setup complexity and running costs.¹Independent reviews are sparse; Reddit users flag steep Kafka minimum pricing while case studies report major ops-time savings.11
Biggest gotchaCVE-2025-64513: unauthenticated auth bypass in the proxy. Patch immediately if internet-exposed.Cloud Kafka has a high price floor . model total monthly cost before committing13

Pick Milvus when

  • RAG and AI search teams at scale
  • Billion-scale similarity search
  • Engineering orgs wanting open source
  • Teams with dedicated DevOps capacity

When Milvus is not a fit

  • Hobby projects or apps under ~1M vectors
  • Teams with no DevOps or Kubernetes experience
  • Buyers wanting zero-maintenance managed simplicity
  • Anyone who can't patch promptly after CVEs

Pick Instaclustr when

  • Teams running Kafka, Cassandra, or OpenSearch at scale
  • Enterprises outsourcing data-infrastructure ops
  • Open-source-first orgs wanting NetApp-grade security
  • Companies consolidating multiple data stores under one vendor

When Instaclustr is not a fit

  • Small teams needing one simple Postgres . massive overkill
  • Budget-sensitive startups; high Kafka floor pricing
  • Buyers demanding transparent public pricing
  • Hobby projects and prototypes

Sources

  1. I found Milvus to be the fastest open-source vector databasereddit.com
    review
  2. Choosing a vector database for ANN search at Redditmilvus.io
    official
  3. CVE-2025-64513 Authentication Bypass Advisorygithub.com
    security
  4. Milvus Unauthenticated DoS via Management Stop . VulnCheckvulncheck.com
    security
  5. How to Cut Vector Database Costs by Up to 80%milvus.io
    official
  6. Zilliz raises $60M, relocates to SF . TechCrunchtechcrunch.com
    news
  7. Zilliz Cloud Pricingzilliz.com
    official
  8. pgvector vs Milvus: 5 key differencesinstaclustr.com
    review
  9. Milvus Review . 4.7 from 11 Reviews (Crystil)growth.crystil.com
    review
  10. Our Journey to 35K+ GitHub Starsmilvus.io
    official
  11. Instaclustr Reviews - G2g2.com
    review
  12. Instaclustr Managed Solutions Reviews - G2g2.com
    review
  13. The Floor Price of Kafka (in the cloud) - Redditreddit.com
    review
  14. Instaclustr 3.7 rating - RFP.wikirfp.wiki
    review
  15. Instaclustr for Apache Cassandra Reviews - Gartnergartner.com
    review
  16. Instaclustr Pricinginstaclustr.com
    official