What It Does
Zilliz Cloud is the fully managed commercial version of Milvus, operated by Zilliz — the company that created and primarily maintains the open-source Milvus project. It provides the full Milvus API and data model with no Kubernetes operations required, plus additional enterprise features not present in open-source Milvus: a proprietary Cardinal search engine, a 99.95% SLA, SOC 2 Type II and ISO 27001 certifications, HIPAA readiness, BYOC (Bring Your Own Cloud) deployment, and GDPR compliance.
Zilliz Cloud runs on AWS, Azure, and Google Cloud. Pricing follows a dedicated cluster model (starting at $99/month) plus serverless pay-per-use at $4 per million vector compute units (vCUs). A significant pricing restructure in October 2025 reduced storage costs from $0.30 to $0.04/GB/month (87% reduction) and compute costs by 25%, substantially improving competitiveness against Pinecone and Weaviate Cloud.
Key Features
- Cardinal search engine: Zilliz’s proprietary search engine (not open-source), reportedly delivering higher QPS and lower latency than equivalent open-source Milvus configurations
- Zero ops: No Kubernetes, etcd, object storage, or Woodpecker management — all infrastructure operated by Zilliz
- Serverless tier: Pay-per-use at $4/million vCUs; suitable for unpredictable or low-volume workloads
- Dedicated clusters: Reserved capacity for production workloads with predictable performance; starting at $99/month
- Multi-cloud support: AWS, Azure, and Google Cloud with standardized $0.04/GB/month storage pricing across all three
- BYOC (Bring Your Own Cloud): Deploy Zilliz Cloud infrastructure into your own AWS/Azure/GCP account for data sovereignty
- Enterprise compliance: SOC 2 Type II, ISO 27001, GDPR, HIPAA readiness, audit logs, RBAC
- Business Critical tier: Designed for regulated industries (healthcare, finance, government) with the strictest compliance and SLA requirements
- Migration tooling: Managed migration service and Vector Transport Service (VTS) for moving data from self-hosted Milvus, Pinecone, Qdrant, or Elasticsearch
- Attu integration: Web UI for cluster management, data exploration, and vector search (open-source, maintained by Zilliz)
Use Cases
- Enterprise RAG pipelines: Teams running RAG at scale who need a compliant, SLA-backed vector database without dedicating platform engineering to Milvus operations
- Migration from self-hosted Milvus: Organizations that bootstrapped on open-source Milvus but need to reduce ops burden as scale increases
- Regulated industry deployments: Healthcare, financial services, and government applications requiring HIPAA readiness, SOC 2, and GDPR compliance with a dedicated SLA
- Unpredictable workloads: Applications with bursty or seasonal vector search patterns that benefit from serverless pay-per-use billing
- BYOC requirements: Enterprises with data residency requirements that cannot use multi-tenant SaaS but want managed infrastructure
Adoption Level Analysis
Small teams (<20 engineers): Conditional fit. The serverless tier ($4/million vCUs) removes ops overhead at low cost, making it viable for small teams. However, ChromaDB or Qdrant Cloud may be cheaper and simpler at sub-10M vector scale. Zilliz Cloud makes sense here if the team anticipates rapid scaling or needs Milvus API compatibility for future self-hosting options.
Medium orgs (20–200 engineers): Good fit. The October 2025 pricing restructure brings Zilliz Cloud TCO within range of Qdrant Cloud and Weaviate Cloud for medium-scale deployments. SOC 2 and RBAC address compliance requirements common at this tier. Avoids needing a platform engineer dedicated to Milvus cluster operations.
Enterprise (200+ engineers): Strong fit. Purpose-built for this tier with Business Critical plan, BYOC, 99.95% SLA, and regulated industry compliance. The proprietary Cardinal engine provides performance headroom beyond open-source Milvus. Total cost of ownership relative to self-hosted should account for the platform team cost savings, not just compute/storage line items.
Alternatives
| Alternative | Key Difference | Prefer when… |
|---|---|---|
| Milvus (self-hosted) | Full Apache-2.0 control, no vendor lock-in, requires Kubernetes ops | You have platform engineering capacity and want to eliminate vendor dependency |
| Pinecone | Purpose-built managed, serverless-first, proprietary API, scales to billions | You want the simplest managed experience and don’t need Milvus API compatibility |
| Weaviate Cloud | BSL-1.1, agentic AI features (Engram), hybrid search | You prioritize AI agent integrations over raw vector search performance |
| Qdrant Cloud | Lower cost, simpler ops, Rust-native performance, Apache-2.0 | Medium-scale workloads where Milvus’s distributed features aren’t needed |
| pgvector on managed Postgres | SQL-native, no separate service, lower cost | You’re already on managed Postgres and vectors are a secondary use case |
Evidence & Sources
- Zilliz Cloud product page
- Zilliz Cloud October 2025 Update: Tiered Storage and Pricing
- Zilliz Cloud Delivers Major Cost Savings (PR Newswire, 2025)
- Milvus Vector Database Pricing: Cloud vs Self-Hosted Cost Guide (Airbyte) — independent cost comparison
- Zilliz vs. self-hosted Milvus comparison — vendor comparison (note: vendor-authored)
Notes & Caveats
- Cardinal engine is proprietary: Zilliz Cloud’s performance advantage over open-source Milvus comes from the Cardinal search engine, which is not open-source. If you need to migrate from Zilliz Cloud to self-hosted Milvus, you will lose this performance headroom. Independent benchmarks of Cardinal vs. open-source Milvus are sparse — rely on vendor benchmarks only after independent verification.
- Funding context: Zilliz raised $113M across four rounds, most recently a $60M Series B in August 2022. No Series C or later rounds have been publicly disclosed as of April 2026. Four-year-old financing at current AI infrastructure market valuations is worth monitoring for business continuity risk.
- VectorDBBench conflict of interest: Zilliz publishes the VectorDBBench leaderboard where Zilliz Cloud consistently ranks near the top. The benchmark has documented methodological flaws (single-client latency, post-ingestion-only testing). Do not rely on Zilliz’s published benchmark results to justify a procurement decision — run independent tests.
- API compatibility with open-source Milvus: The Zilliz Cloud API is compatible with open-source Milvus, which means migration between the two is more feasible than typical SaaS lock-in scenarios. This is a genuine architectural advantage over Pinecone (proprietary API) or Weaviate (different data model).
- BYOC availability: BYOC (Bring Your Own Cloud) requires the Business Critical plan and is aimed at regulated industries. Standard dedicated and serverless tiers are multi-tenant managed infrastructure. Review data residency requirements before choosing the tier.
- October 2025 price restructure: The 87% storage cost reduction materially changed the competitive position of Zilliz Cloud. Cost comparisons published before Q4 2025 are outdated. Verify current pricing before modeling TCO.