Optic

Optic is an open source tool for OpenAPI linting, diffing, and testing that helps prevent breaking changes, publish accurate documentation, and improve API design through behavior-aware specification comparison and forwards-only governance.

Optic publishes 1 API on the APIs.io network. Tagged areas include API Governance, Breaking Changes, Contract Testing, Diff, and Linting.

Optic’s developer surface includes documentation and 6 more developer resources.

🌐 Visit website 📡 Source on GitHub
19.7/100 emerging ▬ flat Agent 3/100 human only Full breakdown ↓
scored 2026-08-05 · rubric v0.9.1
AccessFreemium
1 APIs
API GovernanceBreaking ChangesContract TestingDiffLintingOpenAPITesting

Kin Score

Kin Score Kin Score How this is scored →
scored 2026-08-05 · rubric v0.9.1
Composite quality — 19.7/100 · emerging
Contract Quality 0.0 / 25
Developer Ergonomics 1.7 / 20
Commercial Clarity 7.9 / 20
Operational Transparency 4.1 / 13
Governance 0.0 / 12
Discoverability 5.9 / 10
Agent readiness — 3/100 · human only
Machine-Readable Contract 0 / 18
Agentic Access Contract 0 / 10
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 7 / 7
Typed Event Surface 0 / 6
Agent Skills 0 / 5
Well-Known Catalog 0 / 4
Consent & Bot Identity 0 / 3
A2A Agent Card 0 / 8
Dry-Run / Simulate Mode 0 / 4
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/optic: open an issue to ask a question, or submit a pull request to add artifacts. Want it done for you? Prioritized profiling — $2,500 →

APIs 1

Individual APIs this provider publishes, each with its own machine-readable definition.

Optic CLI

The Optic CLI provides OpenAPI diffing, linting, and breaking change detection from the command line, comparing two versions of an OpenAPI specification using behavior-aware dif...

Pricing Plans 1

Published pricing tiers and plan structures.

Optic Plans Pricing

3 plans

PLANS

Rate Limits 1

Documented rate limits and quota policies.

Optic Rate Limits

5 limits

RATE LIMITS

FinOps 1

Cost, billing, and metering signals for API financial operations.

Optic Finops

FINOPS

Security Posture 2

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

Optic Domain Security

DMARC

SECURITY

Optic Vulnerability Disclosure

security.txt · contact published

SECURITY

Resources

Documentation 1

Reference material describing how the API behaves

Documentation
Documentation

Build 1

SDKs, sample code, and the tooling you integrate with

GitHubRepository
GitHubRepository

Access & Security 2

Authentication, authorization, and security posture

VulnerabilityDisclosure
VulnerabilityDisclosure
 DomainSecurity
DomainSecurity

Company 2

The organization behind the API

LinkedIn
LinkedIn
 Website
Website

Other 1

Properties that don't map to a standard resource type

Core Concepts
Core Concepts

Source (apis.yml)

apis.yml Raw ↑ 
aid: optic
name: Optic
description: Optic is an open source tool for OpenAPI linting, diffing, and testing that helps prevent breaking changes, publish
  accurate documentation, and improve API design through behavior-aware specification comparison and forwards-only governance.
type: Index
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
url: https://raw.githubusercontent.com/api-evangelist/optic/refs/heads/main/apis.yml
created: '2026-03-25'
modified: '2026-03-26'
specificationVersion: '0.19'
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 using behavior-aware diffing and applying style guide rules with forwards-only
    governance.
  humanURL: https://www.useoptic.com/docs
  tags:
  - Breaking Changes
  - CLI
  - Diff
  - Linting
  - OpenAPI
  properties:
  - type: Documentation
    url: https://www.useoptic.com/docs
  - type: GettingStarted
    url: https://www.useoptic.com/docs
  - type: OpenAPI Diff
    url: https://www.useoptic.com/docs/diff-openapi
  - type: Breaking Changes
    url: https://www.useoptic.com/docs/detect-breaking-changes
  - type: Linting
    url: https://www.useoptic.com/docs/lint-openapi
  - type: ChangeLog
    url: https://www.useoptic.com/docs/openapi-changelog
  - type: API Verification
    url: https://www.useoptic.com/docs/verify-openapi
common:
- type: VulnerabilityDisclosure
  url: security/optic-vulnerability-disclosure.yml
- type: DomainSecurity
  url: security/optic-domain-security.yml
- type: LinkedIn
  url: https://www.linkedin.com/company/useoptic
- type: Website
  url: https://www.useoptic.com
- type: Documentation
  url: https://www.useoptic.com/docs
- type: Core Concepts
  url: https://www.useoptic.com/docs/core-concepts
- type: GitHubRepository
  url: https://github.com/opticdev/optic
maintainers:
- FN: Kin Lane
  email: kin@apievangelist.com