Zephyr Project website screenshot

Zephyr Project

The Zephyr Project is a Linux Foundation project that delivers a small, scalable, secure, and open-source real-time operating system (RTOS) for resource-constrained embedded devices. Zephyr supports 1000+ boards across ARM Cortex, RISC-V, ARC, x86, Xtensa, and other architectures, ships with a C kernel, device drivers, networking stacks (BLE, Wi-Fi, Thread, Matter), security subsystems, and is supported by a meta-tool (west), an SDK (sdk-ng), and a broad ecosystem of training partners and commercial silicon and module vendors.

Zephyr Project publishes 3 APIs on the APIs.io network. Tagged areas include Embedded, IoT, Linux Foundation, RTOS, and Open Source.

The Zephyr Project catalog on APIs.io includes 1 JSON-LD context.

Zephyr Project’s developer surface includes developer portal, documentation, API reference, getting-started guide, CLI, engineering blog, release notes, and 13 more developer resources.

40.2/100 thin ▬ flat Agent 3/100 human only Full breakdown ↓
scored 2026-08-05 · rubric v0.9.1
AccessFreemium
3 APIs
EmbeddedIoTLinux FoundationRTOSOpen SourceEdge

Kin Score

Kin Score Kin Score How this is scored →
scored 2026-08-05 · rubric v0.9.1
Composite quality — 40.2/100 · thin
Contract Quality 3.2 / 25
Developer Ergonomics 10.0 / 20
Commercial Clarity 13.7 / 20
Operational Transparency 6.8 / 13
Governance 0.0 / 12
Discoverability 6.5 / 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/zephyr: 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 3

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

Zephyr RTOS Kernel API

The Zephyr kernel C API exposes scheduling, threading, synchronization, memory management, and timer services for real-time embedded applications. It is the foundation that devi...

Zephyr Device Driver API

The Zephyr device driver subsystem exposes a uniform device model across GPIO, I2C, SPI, UART, ADC, sensors, displays, networking, USB, Bluetooth, and many other peripheral clas...

Zephyr Networking API

The Zephyr networking stack exposes BSD-like sockets, TLS/DTLS, MQTT, CoAP, LWM2M, HTTP, WebSocket, gRPC, and connectivity layers including IPv4/IPv6, Wi-Fi, Thread, OpenThread,...

Pricing Plans 1

Published pricing tiers and plan structures.

Zephyr Plans Pricing

3 plans

PLANS

Rate Limits 1

Documented rate limits and quota policies.

Zephyr Rate Limits

5 limits

RATE LIMITS

FinOps 1

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

Semantic Vocabularies 1

JSON-LD contexts and semantic vocabularies used across these APIs.

Zephyr Context

18 classes · 0 properties

JSON-LD

Security Posture 1

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

Zephyr Domain Security

TLSv1.3 · HSTS · DMARC

SECURITY

Resources

Get Started 2

Portal, sign-up, and the first successful call

Documentation 2

Reference material describing how the API behaves

Design & Contract 1

Pagination, idempotency, versioning, errors, and events

Build 4

SDKs, sample code, and the tooling you integrate with

Access & Security 2

Authentication, authorization, and security posture

Learn 1

Tutorials, courses, talks, and written guidance

Operate 1

Status, limits, changes, and where to get help

Commercial 2

Pricing, plans, and the legal terms of use

Company 2

The organization behind the API

Other 3

Properties that don't map to a standard resource type

Source (apis.yml)

apis.yml Raw ↑
aid: zephyr
name: Zephyr Project
description: The Zephyr Project is a Linux Foundation project that delivers a small, scalable, secure, and open-source real-time
  operating system (RTOS) for resource-constrained embedded devices. Zephyr supports 1000+ boards across ARM Cortex, RISC-V,
  ARC, x86, Xtensa, and other architectures, ships with a C kernel, device drivers, networking stacks (BLE, Wi-Fi, Thread,
  Matter), security subsystems, and is supported by a meta-tool (west), an SDK (sdk-ng), and a broad ecosystem of training
  partners and commercial silicon and module vendors.
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
position: Consumer
access: 3rd-Party
image: https://kinlane-images.s3.amazonaws.com/shared/apis-json/icons/zephyr.png
tags:
- Embedded
- IoT
- Linux Foundation
- RTOS
- Open Source
- Edge
created: '2026-03-16'
modified: '2026-05-03'
url: https://raw.githubusercontent.com/api-evangelist/zephyr/refs/heads/main/apis.yml
specificationVersion: '0.19'
apis:
- aid: zephyr:zephyr-kernel-api
  name: Zephyr RTOS Kernel API
  description: The Zephyr kernel C API exposes scheduling, threading, synchronization, memory management, and timer services
    for real-time embedded applications. It is the foundation that device drivers and application code build on.
  humanURL: https://docs.zephyrproject.org/latest/kernel/index.html
  tags:
  - RTOS
  - Embedded
  - Kernel
  properties:
  - type: Documentation
    url: https://docs.zephyrproject.org/latest/kernel/index.html
  - type: APIReference
    url: https://docs.zephyrproject.org/apidoc/latest/index.html
  - type: GettingStarted
    url: https://docs.zephyrproject.org/latest/develop/getting_started/index.html
  - type: GitHubRepository
    url: https://github.com/zephyrproject-rtos/zephyr
- aid: zephyr:zephyr-device-driver-api
  name: Zephyr Device Driver API
  description: The Zephyr device driver subsystem exposes a uniform device model across GPIO, I2C, SPI, UART, ADC, sensors,
    displays, networking, USB, Bluetooth, and many other peripheral classes, configured through Devicetree and Kconfig.
  humanURL: https://docs.zephyrproject.org/latest/build/dts/index.html
  tags:
  - Drivers
  - Devicetree
  - Embedded
  properties:
  - type: Documentation
    url: https://docs.zephyrproject.org/latest/hardware/index.html
  - type: APIReference
    url: https://docs.zephyrproject.org/apidoc/latest/group__io__interfaces.html
- aid: zephyr:zephyr-networking-api
  name: Zephyr Networking API
  description: The Zephyr networking stack exposes BSD-like sockets, TLS/DTLS, MQTT, CoAP, LWM2M, HTTP, WebSocket, gRPC, and
    connectivity layers including IPv4/IPv6, Wi-Fi, Thread, OpenThread, Matter, and BLE.
  humanURL: https://docs.zephyrproject.org/latest/connectivity/networking/index.html
  tags:
  - Networking
  - IoT
  - Connectivity
  properties:
  - type: Documentation
    url: https://docs.zephyrproject.org/latest/connectivity/networking/index.html
common:
- type: DomainSecurity
  url: security/zephyr-domain-security.yml
- type: LinkedIn
  url: https://www.linkedin.com/company/the-zephyr-project
- type: Portal
  name: Zephyr Project
  url: https://www.zephyrproject.org/
- type: Documentation
  name: Zephyr Project Documentation
  url: https://docs.zephyrproject.org/latest/
- type: APIReference
  name: Zephyr API Reference
  url: https://docs.zephyrproject.org/apidoc/latest/index.html
- type: GettingStarted
  name: Zephyr Getting Started Guide
  url: https://docs.zephyrproject.org/latest/develop/getting_started/index.html
- type: GitHubOrganization
  name: Zephyr Project on GitHub
  url: https://github.com/zephyrproject-rtos
- type: GitHubRepository
  name: Zephyr Primary Git Repository
  url: https://github.com/zephyrproject-rtos/zephyr
- type: SDKs
  name: Zephyr SDK (sdk-ng)
  url: https://github.com/zephyrproject-rtos/sdk-ng
- type: CLI
  name: West - Zephyr's Meta-Tool
  url: https://github.com/zephyrproject-rtos/west
- type: Blog
  name: Zephyr Project Blog
  url: https://www.zephyrproject.org/blog/
- type: ReleaseNotes
  name: Zephyr Release Notes
  url: https://docs.zephyrproject.org/latest/releases/index.html
- type: Training
  name: Zephyr Training Partner Program
  url: https://www.zephyrproject.org/training-partner-program/
- type: Events
  name: Zephyr Events
  url: https://www.zephyrproject.org/events/
- type: Compliance
  name: Zephyr Security
  url: https://docs.zephyrproject.org/latest/security/index.html
- type: TermsOfService
  name: Linux Foundation Terms of Use
  url: https://www.linuxfoundation.org/terms
- type: PrivacyPolicy
  name: Linux Foundation Privacy Policy
  url: https://www.linuxfoundation.org/privacy-policy/
- type: JSONLD
  name: Zephyr JSON-LD Context
  url: json-ld/zephyr-context.jsonld
- type: Resources
  name: Zephyr Vocabulary
  url: vocabulary/zephyr-vocabulary.yml
- type: Resources
  name: Zephyr Build Capability
  url: capabilities/zephyr-build.yaml
maintainers:
- FN: Kin Lane
  email: info@apievangelist.com