Weaviate
github.com/weaviate/weaviate- Category
- Developer Tools
- Rank
- No. 361Tools index
- Pricing
- Freemium
- Type
- TOOL
- Builder
- weaviate
- GitHub
- 16.7k stars
- Latest release
- v1.38.9
- Added
- Jul 4, 2026
About
Weaviate is an open-source vector database that combines vector and structured (hybrid) search with cloud-native scalability, storing both objects and their vectors for retrieval and RAG.
What it does
Weaviate manages collections for meaning-based retrieval. It can create embeddings during import through integrated model providers or accept embeddings you generated elsewhere. Queries can combine semantic similarity, BM25 keywords, filters, reranking, and generative search. It also supports image search and automatic object expiry.
Why it's ranked here
The case is strong for teams that need retrieval features and production controls in one server. Multi-tenancy, replication, role-based access, horizontal scaling, compression, and Prometheus metrics address serious operations. The cost is a broad system with substantial configuration, while newer surfaces such as REST semantic search and runtime reindexing remain disabled by default.
What's good
You can change embedding providers or bring precomputed vectors without changing the database role. Python, TypeScript, Java, Go, and .NET clients cover common stacks, while REST, gRPC, and GraphQL keep access flexible. Live property reindexing preserves reads and writes, and replica-movement guards prevent structural changes from leaving copies inconsistent.
Tradeoffs
Several advanced capabilities demand careful operator choices. Usage caps are opt-in, and some are exact only for specific single-node or namespace layouts with one replica. Fast imports can temporarily outrun asynchronous object counts, cold shards may be undercounted, and concurrent schema creates can exceed caps slightly. The experimental REST search endpoint also ignores unknown request fields and lacks a body-size cap.
How to use it well
Use Weaviate when search quality needs semantic retrieval, keyword matching, filters, reranking, or generated answers behind an application. Start locally with Docker, choose integrated vectorization or supply embeddings, then add tenancy, replication, access control, compression, and monitoring as production needs emerge. Do not expect the database alone to provide a finished chatbot or end-user interface; the repository points to separate demo applications for those layers.
Technical notes+
README.md documents Docker and Kubernetes deployment, Weaviate Cloud, five official client languages, and REST, gRPC, and GraphQL APIs. go.mod identifies github.com/weaviate/weaviate as a Go module and includes Raft, OpenTelemetry, Prometheus, cloud storage, authentication, and test dependencies. Makefile builds cmd/weaviate-server/weaviate with CGO disabled, creates Linux amd64 and arm64 OCI images, and exposes unit and integration test targets. docs/metrics.md is the declared source of truth for Prometheus metrics and explicitly tracks label cardinality. docs/usage_limits.md records non-atomic schema cap checks, lagging asynchronous counts, skipped cold shards, and replica-factor restrictions. docs/runtime-reindex.md describes RAFT-backed distributed tasks, bucket swaps, crash recovery, and live reads and writes during rebuilding. docs/replica-movement/schema-guard.md documents collection-scoped guards against structural divergence during shard copying.
Observed
- Primary language
- Go, with module path github.com/weaviate/weaviate.
- Deployment surface
- Docker, Kubernetes, Weaviate Cloud, AWS, and GCP deployment options are documented.
- Server APIs
- REST, gRPC, and GraphQL APIs are exposed.
- Client libraries
- Official clients are documented for Python, JavaScript/TypeScript, Java, Go, and C#/.NET.
- Container platforms
- The OCI build configuration targets Linux on amd64 and arm64.
- Testing surface
- The Makefile defines separate unit and integration test targets.
- Observability
- Prometheus metrics cover queries, vector indexes, replication, HTTP, gRPC, and distributed tasks.
Read from README.md, go.mod, Makefile, pyproject.toml, docs/metrics.md, docs/usage_limits.md, docs/rest-search-api.md, docs/runtime-reindex.md, docs/replica-movement/schema-guard.md, docs/proposals/deferred_reindex_simplifications.md, cluster/log.go, cluster/raft.go.
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Indexed by a proprietary survey. Corrections welcome.