Optic

aid: optic
name: Optic
description: Optic is an MIT-licensed command-line tool for OpenAPI linting, diffing and testing. It compares two versions
  of an OpenAPI document with behaviour-aware diffing to catch breaking changes before they ship, enforces style-guide rulesets
  (breaking-changes, documentation, examples, naming-changes, Spectral and lintgpt), and generates or verifies OpenAPI from
  captured test traffic via HAR files, Postman collections or a local proxy. Optic Labs was acquired by Atlassian in April
  2024; the hosted Optic Cloud service was disconnected from the CLI at v1.0.0 in August 2024, the documentation site was
  retired in favour of the GitHub Wiki, and the source repository was archived read-only in January 2026 after a final v1.0.9
  release. Optic publishes no callable API of its own — it is a tool that consumes and governs other people's contracts.
type: Index
deliveryModel:
  model: self-hosted
  license: MIT
  open_source: true
  commercial: false
  callable_host: false
  label: Self-hosted open source · you run it yourself
  confidence: high
  source:
  - license
  generated: '2026-08-28'
  method: derived
accessModel:
  pricing: freemium
  onboarding: unknown
  trial: false
  try_now: false
  public: false
  label: Freemium
  confidence: medium
  source:
  - plans
  generated: '2026-07-22'
  method: derived
image: https://kinlane-images.s3.amazonaws.com/shared/apis-json/icons/optic.png
tags:
- API Governance
- Breaking Changes
- Contract Testing
- Diff
- Linting
- OpenAPI
- Testing
- CLI
- Open-Source
- Archived
tags_raw:
- API Governance
- Breaking Changes
- Contract Testing
- Diff
- Linting
- OpenAPI
- Testing
- CLI
- Open Source
- Archived
url: https://raw.githubusercontent.com/api-evangelist/optic/refs/heads/main/apis.yml
created: '2026-03-25'
modified: '2026-08-29'
specificationVersion: '0.23'
apis:
- aid: optic:optic-cli
  name: Optic CLI
  description: The Optic CLI provides OpenAPI diffing, linting and breaking-change detection from the command line, comparing
    two versions of an OpenAPI specification with behaviour-aware diffing and applying style-guide rules with forwards-only
    governance. It runs entirely locally against files in a git working tree and requires no credential; the optional Optic
    Cloud upload targets were removed at v1.0.0 and their hosts no longer resolve.
  humanURL: https://github.com/opticdev/optic/wiki
  tags:
  - Breaking Changes
  - CLI
  - Diff
  - Linting
  - OpenAPI
  properties:
  - type: Documentation
    url: https://github.com/opticdev/optic/wiki
  - type: GettingStarted
    url: https://github.com/opticdev/optic/wiki
  - type: CLI
    url: cli/optic-cli.yml
  - type: OpenAPI Diff
    url: https://github.com/opticdev/optic/wiki/Diff-and-Lint-OpenAPI
  - type: Breaking Changes
    url: https://github.com/opticdev/optic/wiki/Prevent-Breaking-Changes
  - type: Linting
    url: https://github.com/opticdev/optic/wiki/Running-Spectral-Rules
  - type: Custom Rulesets
    url: https://github.com/opticdev/optic/wiki/Building-Custom-Rulesets
  - type: Traffic Capture
    url: https://github.com/opticdev/optic/wiki/Using-Optic-Capture-with-Integration-Tests
common:
- type: Website
  url: https://github.com/opticdev/optic
- type: Documentation
  url: https://github.com/opticdev/optic/wiki
- type: GettingStarted
  url: https://github.com/opticdev/optic/wiki
- type: GitHubRepository
  url: https://github.com/opticdev/optic
- type: GitHubOrganization
  url: https://github.com/opticdev
- type: IssueTracker
  url: https://github.com/opticdev/optic/issues
- type: Support
  url: https://github.com/opticdev/optic/discussions
- type: Releases
  url: https://github.com/opticdev/optic/releases
- type: License
  name: MIT
  url: https://github.com/opticdev/optic/blob/main/LICENSE
- type: LinkedIn
  url: https://www.linkedin.com/company/useoptic
- type: ChangeLog
  url: changelog/optic-changelog.yml
- type: Lifecycle
  url: lifecycle/optic-lifecycle.yml
- type: CLI
  url: cli/optic-cli.yml
- type: Packages
  url: packages/optic-packages.yml
- type: SDKs
  url: packages/optic-packages.yml
- type: Conventions
  url: conventions/optic-conventions.yml
- type: Conformance
  url: conformance/optic-conformance.yml
- type: WellKnown
  url: well-known/optic-well-known.yml
- type: SecurityTxt
  url: well-known/optic-security.txt
- type: Security
  url: security/optic-vulnerability-disclosure.yml
- type: VulnerabilityDisclosure
  url: security/optic-vulnerability-disclosure.yml
- type: DomainSecurity
  url: security/optic-domain-security.yml
- type: LLMsTxt
  url: llms/optic-llms.txt
maintainers:
- FN: Kin Lane
  email: kin@apievangelist.com
x-enrichment:
  date: '2026-08-29'
  status: enriched
  artifacts_added: 9
  pass: local-v1
x-coverage:
  state: none
  reason: defunct
  detail: Optic never shipped a callable API and the company no longer exists as an independent surface — Optic Labs was absorbed
    by Atlassian in April 2024, the Optic Cloud REST backend named in its own open-source client (api.useoptic.com) and the
    docs host (www.useoptic.com) both return NXDOMAIN, useoptic.com 301s to the GitHub repository, and that repository was
    archived read-only in January 2026 with no sunset notice.
  evidence:
  - url: https://useoptic.com/
    status: 301
  - url: https://www.useoptic.com/docs
    status: 0
  - url: https://api.useoptic.com/openapi.json
    status: 0
  - url: https://github.com/opticdev/optic
    status: 200
  - url: https://github.com/opticdev/optic/wiki
    status: 200
  checked: '2026-08-29'