OpenFeature website screenshot

OpenFeature

OpenFeature is a CNCF incubating open specification for feature flag management. It provides a vendor-agnostic API for evaluating feature flags, enabling developers to use a consistent interface regardless of the underlying feature flag provider. OpenFeature offers SDKs in multiple languages including Go, Java, JavaScript, Python, PHP, and .NET with a provider-based architecture.

OpenFeature publishes 1 API on the APIs.io network: OFREP Core API. Tagged areas include Cloud Native, Feature Flags, Feature Management, Incubating, and SDKs.

OpenFeature’s developer surface includes authentication, documentation, engineering blog, and 4 more developer resources.

🌐 Visit website 📡 Source on GitHub
39.8/100 thin ▬ flat Agent 47/100 agent ready Full breakdown ↓
scored 2026-08-05 · rubric v0.9.1
AccessFreemiumSelf serve⚡ Free to try
1 APIs
Cloud NativeFeature FlagsFeature ManagementIncubatingSDKsSpecification

Kin Score

Kin Score Kin Score How this is scored →
scored 2026-08-05 · rubric v0.9.1
Composite quality — 39.8/100 · thin
Contract Quality 16.1 / 25
Developer Ergonomics 4.3 / 20
Commercial Clarity 7.9 / 20
Operational Transparency 4.8 / 13
Governance 0.0 / 12
Discoverability 6.7 / 10
Agent readiness — 47/100 · agent ready
Machine-Readable Contract 18 / 18
Agentic Access Contract 10 / 10
MCP Server 0 / 12
Machine-Readable Auth 10 / 10
Idempotency 0 / 9
Stable Error Semantics 8 / 8
Request/Response Examples 7 / 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/openfeature: 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.

OpenFeature OFREP Core API

**Required**: Core APIs to implement to support OFREP. *This is the minimum set of APIs required for a flag management system to be OFREP compatible.*

Pricing Plans 1

Published pricing tiers and plan structures.

Openfeature Plans Pricing

3 plans

PLANS

Rate Limits 1

Documented rate limits and quota policies.

Openfeature Rate Limits

5 limits

RATE LIMITS

FinOps 1

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

Openfeature Finops

FINOPS

Security Posture 2

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

Openfeature Authentication

apiKey/http · 2 schemes

SECURITY

Openfeature Domain Security

TLSv1.3 · HSTS

SECURITY

Agentic Access 1

Recommended x-agentic-access execution contracts for AI agents.

Openfeature Agentic Access

2 operations · 2 acting

2 operations · 2 acting

AGENTIC

Resources

Documentation 1

Reference material describing how the API behaves

Documentation
Documentation

Agent Surfaces 1

MCP servers, agent skills, and machine-readable catalogs

AgenticAccess
AgenticAccess

Build 1

SDKs, sample code, and the tooling you integrate with

GitHubOrg
GitHubOrg

Access & Security 2

Authentication, authorization, and security posture

DomainSecurity
DomainSecurity
 Authentication
Authentication

Company 2

The organization behind the API

LinkedIn
LinkedIn
 Blog
Blog

Source (apis.yml)

apis.yml Raw ↑ 
aid: openfeature
name: OpenFeature
description: OpenFeature is a CNCF incubating open specification for feature flag management. It provides a vendor-agnostic
  API for evaluating feature flags, enabling developers to use a consistent interface regardless of the underlying feature
  flag provider. OpenFeature offers SDKs in multiple languages including Go, Java, JavaScript, Python, PHP, and .NET with
  a provider-based architecture.
url: https://openfeature.dev
accessModel:
  pricing: freemium
  onboarding: self-serve
  trial: false
  try_now: true
  public: false
  label: Freemium · Self-serve signup
  confidence: high
  source:
  - plans
  - authentication
  generated: '2026-07-22'
  method: derived
image: https://kinlane-images.s3.amazonaws.com/shared/apis-json/icons/openfeature.png
tags:
- Cloud Native
- Feature Flags
- Feature Management
- Incubating
- SDKs
- Specification
created: '2026-03-16'
modified: '2026-05-19'
specificationVersion: '0.19'
type: Index
apis:
- aid: openfeature:openfeature-ofrep-core-api
  name: OpenFeature OFREP Core API
  description: "**Required**: Core APIs to implement to support OFREP.  \n*This is the minimum set of APIs required for a\
    \ flag management system to be OFREP compatible.*"
  humanURL: https://openfeature.dev/docs/reference/intro
  tags:
  - OFREP Core
  properties:
  - type: OpenAPI
    url: openapi/openfeature-ofrep-core-api-openapi.yml
  - type: Documentation
    url: https://openfeature.dev/docs/reference/intro
common:
- type: AgenticAccess
  url: agentic-access/openfeature-agentic-access.yml
- type: DomainSecurity
  url: security/openfeature-domain-security.yml
- type: Authentication
  url: authentication/openfeature-authentication.yml
- type: LinkedIn
  url: https://www.linkedin.com/company/openfeature
- type: Documentation
  name: OpenFeature Documentation
  description: Official OpenFeature documentation.
  url: https://openfeature.dev/docs/
- type: GitHubOrg
  name: OpenFeature GitHub
  description: Source code and SDKs.
  url: https://github.com/open-feature
- type: Integrations
  url: https://openfeature.dev/ecosystem/
- type: Blog
  url: https://openfeature.dev/blog/rss.xml
integrations:
- name: OpenFeature
- name: Deploys by Netlify
maintainers:
- FN: Kin Lane
  email: kin@apievangelist.com