emerging · -0.1 market domain

Vector Database

Score 21.1 / 100 26 providers 7 APIs Search apis.io →
Variants seen in the corpus: Vector Databasevector-database

Providers using this tag (26)

Ranked by API Evangelist rating — Exemplar and Strong are expanded by default.

Strong 3 Solid coverage with minor gaps
SeekrArtificial IntelligenceGenerative AIAgentsLLM35 APIs61.3IronCore LabsCompanyEncryptionData PrivacySecurity5 APIs56.4MixedbreadArtificial IntelligenceEmbeddingsRerankingSearch14 APIs55.6
Developing 5 Usable, with meaningful gaps to close
VespaArtificial IntelligenceSearchBig Data9 APIs52.6WeaviateArtificial IntelligenceMachine-LearningSemantic Search22 APIs49.1ChromaArtificial IntelligenceAI-NativeApache 2.0Cloud8 APIs46.8LanceDBMulti-ModalLance FormatLakehouse16 APIs44.2DataStaxCompanyEnterpriseDatabase17 APIs44.0
Thin 15 Limited public surface area
Nomic AIEmbeddingsData ExplorationLLM12 APIs39.0ChromaVector IndexVector SearchVector Store6 APIs37.9MyScaleSQLClickHouseVector Search2 APIs37.7Crate IoCompanyDatabaseSQLDistributed Database2 APIs37.4VectorizeArtificial IntelligenceRAGVectorizationEmbeddings8 APIs37.4MarqoVector SearchMulti-ModalSemantic Search7 APIs36.7contentstack45 APIs36.3Gel DataCompanyOpen-SourceDatabasePostgreSQL31.9MilvusArtificial IntelligenceEmbeddingsOpen-Source8 APIs30.9SurrealDBDatabaseMulti-ModelGraph DatabaseDocument Database2 APIs30.8UpstashServerlessRedisKafkaMessaging7 APIs30.7ZillizArtificial IntelligenceCloudMilvus5 APIs30.3Azure Cosmos DBDatabaseNoSQLDocument Database11 APIs29.8AerospikeDatabaseNoSQLReal-TimeKey-Value3 APIs26.3KAITOArtificial IntelligenceGPUInferenceKubernetes5 APIs26.3
Emerging 3 Early or largely undocumented
ObjectBoxCompanyDatabaseEmbedded DatabaseMobile Database17.4LF AI and DataArtificial IntelligenceMachine-LearningDataLinux Foundation11 APIs17.2SequoiaDBCompanyEnterpriseDatabaseNoSQL12.2

APIs with this tag (7)

Ranked by the provider's API Evangelist rating — the Kin Score is scored per provider, not per API, so every API of a provider shares its band. How the rating works →

Strong 1 Solid coverage with minor gaps
Seekr Vector database APIThe Vector database API from Seekr — 11 operation(s) for vector database.61.3
Developing 2 Usable, with meaningful gaps to close
Chroma JavaScript ClientThe Chroma JavaScript and TypeScript Client is a first-party SDK for interacting with Chroma from JavaScrip...46.8Chroma Python ClientThe Chroma Python Client is a first-party SDK for interacting with both self-hosted Chroma servers and Chro...46.8
Thin 3 Limited public surface area
Contentstack Knowledge Vault APIThe Contentstack Knowledge Vault API provides endpoints for ingesting, updating, and deleting content items...36.3Upstash Developer APIManagement API for creating and administering Upstash Redis, Kafka, and Vector databases, teams, and accoun...30.7KAITO RAGEngine APIRAGEngine exposes endpoints for managing retrieval-augmented generation services with embedded vector datab...26.3
Emerging 1 Early or largely undocumented
MilvusMilvus is an open source vector database built for scalable similarity search, supporting embedding-based A...17.2

Score breakdown

Frequency
41.1
log-scaled weighted occurrences
Breadth
0.7
spread across providers
Quality lift
44.3
mean composite of providers using it
Cohesion
11.6
strength of nearest seed neighbor

Related tags

RAG 11 co-occurrences Vector Search 5 co-occurrences Embeddings 8 co-occurrences Cluster 6 co-occurrences Database 8 co-occurrences Collection 5 co-occurrences Cloud 5 co-occurrences Open-Source 12 co-occurrences

Where this tag comes from

Provider tag24
Api tag7

Cohort brief

Auto-generated

The 26 providers in the APIs.io catalog tagged Vector Database, scored on the Kin Score. Every figure below is computed from the catalog — nothing here is written.

Providers
26
all scored
Mean Kin Score
36.8
+16.1 vs catalog 20.7
Mean Agent Readiness
19.1
+9.4 vs catalog 9.7
Spread
12.2–61.3
median 37.1 · σ 12
How the 26 split by band
Exemplar 0Strong 3Developing 5Thin 15Emerging 3Minimal 0
Facet averages, against the whole catalog
FacetThis cohortCatalogDifferenceScored
Contract Quality 43.9 17.5 +26.4 26
Developer Ergonomics 36.4 17.9 +18.5 26
Operational Transparency 25.8 11.3 +14.5 26
Access Clarity 33.5 22.3 +11.2 26
Discoverability 70.9 60.4 +10.5 26
Contract Governance 9.9 6.4 +3.5 26

A facet is averaged over the members that carry it, not over the whole cohort — the “Scored” column is that count. Averaging an absent facet as zero would score our own coverage gaps as the providers’ posture.

What this cohort publishes
ArtifactThis cohortCatalogDifference
MCP server (any) 23% 16% +7
MCP server (first-party) 15% 7% +8
Agent Skills 0% 0% 0
OAuth scopes 12% 9% +3
Security 96% 88% +8
Arazzo workflows 4% 2% +2
Governance rules 23% 13% +10

mcp_pct counts any mcp/ artifact including ones API Evangelist derived from the provider OpenAPI; mcp_first_party_pct counts only servers the provider publishes. Prefer the latter.

Top by Kin Score
  1. 1 Seekr 61.3
  2. 2 IronCore Labs 56.4
  3. 3 Mixedbread 55.6
  4. 4 Vespa 52.6
  5. 5 Weaviate 49.1
  6. 6 Chroma 46.8
  7. 7 LanceDB 44.2
  8. 8 DataStax 44
  9. 9 Nomic AI 39
  10. 10 Chroma 37.9
Top by Agent Readiness
  1. 1 Seekr 35.8
  2. 2 Weaviate 34.3
  3. 3 IronCore Labs 26.8
  4. 4 Chroma 25.5
  5. 5 Mixedbread 25.5
  6. 6 MyScale 24.8
  7. 7 Vespa 24.5
  8. 8 LanceDB 24.4
  9. 9 DataStax 23.9
  10. 10 Nomic AI 22.3
All 26 members of this roster resolve to a scored provider in the catalog.Generated from the catalog build of 25 August 2026, across 26891 providers, using the same computation served by the APIs.io cohort API. Briefs are published for rosters of 5 or more scored providers; below that a distribution is not meaningful.

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Tools for tags

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  • find_tagsBrowse and filter every tag in the catalog.
  • get_cohortThis tag as a scored cohort — every provider carrying it, with scores.
  • cohort_statsPRO — the distribution across this tag: mean, median, band split, adoption rates.
  • cohort_rankingsPRO — the leaderboard, on composite AND agent-readiness axes.
  • apis_io_searchSTART HERE — APIs, providers and tags for one query, each with its total.
  • resolveTurn a domain, URL or GitHub org into the provider it belongs to.
  • find_cohortsEvery scored population of providers in the catalog.
All 92 tools

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All tags 
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As a scored cohort 
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The distribution (Pro) 
curl "https://apis.io/api/v1/cohorts/tag/vector-database/stats" \
  -H "X-API-Key: $APIS_IO_KEY"

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