Ossus

Ossus builds AI-native intelligence for cultural institutions, starting with libraries. Its flagship product is Ossus ILS, a modern integrated library system that unifies cataloguing, circulation, acquisitions, analytics, and patron discovery in one interface, with an AI copilot that drafts MARC records, subjects, and classifications for librarian approval. A lighter product, Librar, targets school libraries with fast mobile setup. AI add-ons cover camera-based shelf inventory, vendor comparison for purchasing, and grant finding. Ossus emphasizes privacy-first design: it does not train on or sell customer data and works only with catalogue metadata rather than borrower records. Ossus is a Y Combinator (Winter 2026) company based in San Francisco.

Ossus is profiled on the APIs.io network. Tagged areas include Company, Libraries, Library Management, Integrated Library System, and Cataloguing.

Ossus’ developer surface includes engineering blog and 4 more developer resources.

🌐 Visit website 📡 Source on GitHub
10.4/100 minimal ▬ flat Agent 0/100 human only Full breakdown ↓
scored 2026-07-27 · rubric v0.5
0 APIs
CompanyLibrariesLibrary ManagementIntegrated Library SystemCataloguingMARCCultural InstitutionsArtificial IntelligenceEducation

Kin Score

Kin Score Kin Score How this is scored →
scored 2026-07-27 · rubric v0.5
Composite quality — 10.4/100 · minimal
Contract Quality 0.0 / 25
Developer Ergonomics 0.4 / 20
Commercial Clarity 3.2 / 20
Operational Transparency 0.0 / 13
Governance 0.0 / 12
Discoverability 6.8 / 10
Agent readiness — 0/100 · human only
Machine-Readable Contract 0 / 18
Agentic Access Contract 0 / 15
MCP Server 0 / 12
Machine-Readable Auth 0 / 10
Idempotency 0 / 9
Stable Error Semantics 0 / 8
Request/Response Examples 0 / 7
Rate-Limit Signaling 0 / 7
Typed Event Surface 0 / 6
Agent Skills 0 / 5
Well-Known Catalog 0 / 4
Consent & Bot Identity 0 / 3
Improve this rating by publishing the missing artifacts — every area above can be raised, and the full rubric is at apis.io/rating/. This rating is computed from github.com/api-evangelist/ossus: open an issue to ask a question, or submit a pull request to add artifacts. Want it done for you? Prioritized profiling — $2,500 →

Security Posture 2

Authentication, domain security, vulnerability disclosure, and trust-center signals.

Ossus Domain Security

TLSv1.3 · HSTS · DMARC

SECURITY

Ossus Trust Center

SOC 2, ISO 27001

SECURITY

Resources

Access & Security 3

Authentication, authorization, and security posture

TrustCenter
TrustCenter
 DomainSecurity
DomainSecurity
 Compliance
Compliance

Company 2

The organization behind the API

Website
Website
 Blog
Blog

Source (apis.yml)

apis.yml Raw ↑ 
aid: ossus
accessModel:
  pricing: unknown
  onboarding: unknown
  trial: false
  try_now: false
  public: false
  label: Unknown
  confidence: low
  source: []
  generated: '2026-07-22'
  method: derived
image: https://kinlane-images.s3.amazonaws.com/shared/apis-json/icons/ossus.png
name: Ossus
description: 'Ossus builds AI-native intelligence for cultural institutions, starting with libraries. Its flagship product
  is Ossus ILS, a modern integrated library system that unifies cataloguing, circulation, acquisitions, analytics, and patron
  discovery in one interface, with an AI copilot that drafts MARC records, subjects, and classifications for librarian approval.
  A lighter product, Librar, targets school libraries with fast mobile setup. AI add-ons cover camera-based shelf inventory,
  vendor comparison for purchasing, and grant finding. Ossus emphasizes privacy-first design: it does not train on or sell
  customer data and works only with catalogue metadata rather than borrower records. Ossus is a Y Combinator (Winter 2026)
  company based in San Francisco.'
url: https://raw.githubusercontent.com/api-evangelist/ossus/refs/heads/main/apis.yml
x-type: company
x-source: vc-portfolio
x-backed-by:
- y-combinator
x-tier: stub
x-tier-reason: portfolio-lead
specificationVersion: '0.20'
created: '2026-07-17'
modified: '2026-07-20'
tags:
- Company
- Libraries
- Library Management
- Integrated Library System
- Cataloguing
- MARC
- Cultural Institutions
- Artificial Intelligence
- Education
apis: []
common:
- type: TrustCenter
  url: security/ossus-trust-center.yml
- type: DomainSecurity
  url: security/ossus-domain-security.yml
- type: Website
  url: https://www.ossus.com
- type: Blog
  url: https://www.ossus.com/blog
- type: Compliance
  url: https://trust.ossus.com/
maintainers:
- FN: Kin Lane
  email: kin@apievangelist.com
- FN: APIs.json
  email: info@apis.io
x-enrichment:
  date: '2026-07-20'
  status: enriched
  artifacts_added: 2
  pass: local-v1