# Zephyr RTOS - **Canonical URI:** https://www.vioscale.ai/software/zephyr-rtos - **Category:** Embedded IOT Dev - **Homepage:** https://zephyrproject.org - **Also known as:** zephyr-rtos - **Profile claimed by vendor:** no - **Last updated:** 2026-08-26T19:21:49.266Z ## Vioscale score **52.8 / 100**, confidence 40% (low). Computed 2026-09-01. Composite of weighted, independently-sourced signals (no user reviews, no vendor payment). | Signal | Score | Weight | Contribution | Evidence present | |---|--:|--:|--:|:--:| | price_level | 100 | 0.052 | 5.2 | ✓ | | reliability | 0 | 0.073 | 0 | - | | capabilities | 28.9 | 0.084 | 2.4 | ✓ | | repo_stars | 79.5 | 0.026 | 2.1 | ✓ | | integrations | 8.7 | 0.09355555555555557 | 0.8 | ✓ | | dependent_projects | 0 | 0.063 | 0 | ✓ | | dev_activity | 63.1 | 0.094 | 5.9 | ✓ | | release_cadence | 96.7 | 0.052 | 5 | ✓ | | security_posture | 0 | 0.073 | 0 | - | | package_downloads | 0 | 0.136 | 0 | - | | security_score | 71 | 0.042 | 3 | ✓ | | pricing_transparency | 80 | 0.084 | 6.7 | ✓ | | community_qa_activity | 0 | 0.063 | 0 | - | ## Pricing _As of 2026-08-21, [verify at source](https://zephyrproject.org). Independently observed._ Open source · Free tier ## About Zephyr is a real-time operating system optimized for resource-constrained embedded devices, ranging from simple sensors to sophisticated IoT devices and gateways. It provides a small-footprint kernel supporting multiple processor architectures and is built with security and long-product-lifecycle support as core design principles. _Independently observed._ ## Platform & deployment - **Deployment:** Self-hosted ## Integrations (1) _Independently observed._ - PlatformIO ## Capabilities _The capabilities that matter for Embedded IOT Dev. "-" = undocumented, not absent._ | Capability | Supported | |---|:--:| | **Capabilities** | | | Target class | Both | | Rtos type | - | | Low power support | - | | Tls dtls stack | - | | Ota updates | - | | Device management console | - | | Device provisioning | - | | Open source | ✓ | | PSA certified | - | | Rust support | - | ## Release history | Version | Date | Type | |---|---|---| | [v4.4.2](https://github.com/zephyrproject-rtos/zephyr/releases/tag/v4.4.2) | 2026-08-07 | stable | | [v3.7.3-rc1](https://github.com/zephyrproject-rtos/zephyr/releases/tag/v3.7.3-rc1) | 2026-08-06 | prerelease | | [v4.4.2-rc1](https://github.com/zephyrproject-rtos/zephyr/releases/tag/v4.4.2-rc1) | 2026-07-29 | prerelease | | [v4.3.1](https://github.com/zephyrproject-rtos/zephyr/releases/tag/v4.3.1) | 2026-06-23 | stable | | [v4.3.1-rc1](https://github.com/zephyrproject-rtos/zephyr/releases/tag/v4.3.1-rc1) | 2026-06-13 | prerelease | | [v4.4.1](https://github.com/zephyrproject-rtos/zephyr/releases/tag/v4.4.1) | 2026-06-10 | stable | | [v4.4.1-rc1](https://github.com/zephyrproject-rtos/zephyr/releases/tag/v4.4.1-rc1) | 2026-06-03 | prerelease | | [v4.4.0](https://github.com/zephyrproject-rtos/zephyr/releases/tag/v4.4.0) | 2026-04-14 | stable | | [v4.4.0-rc3](https://github.com/zephyrproject-rtos/zephyr/releases/tag/v4.4.0-rc3) | 2026-04-08 | prerelease | | [v4.4.0-rc2](https://github.com/zephyrproject-rtos/zephyr/releases/tag/v4.4.0-rc2) | 2026-04-02 | prerelease | | [v3.7.2](https://github.com/zephyrproject-rtos/zephyr/releases/tag/v3.7.2) | 2026-03-31 | stable | | [v4.4.0-rc1](https://github.com/zephyrproject-rtos/zephyr/releases/tag/v4.4.0-rc1) | 2026-03-24 | prerelease | | [v4.2.2](https://github.com/zephyrproject-rtos/zephyr/releases/tag/v4.2.2) | 2026-03-23 | stable | | [v3.7.2-rc2](https://github.com/zephyrproject-rtos/zephyr/releases/tag/v3.7.2-rc2) | 2026-03-14 | prerelease | | [v4.3.0](https://github.com/zephyrproject-rtos/zephyr/releases/tag/v4.3.0) | 2025-11-13 | stable | _… and 5 earlier release(s)._ ## Security & compliance Known vulnerabilities: 0 (0 in the last 12 months) ([source](https://advisories.ecosyste.ms/api/v1/advisories?ecosystem=go&package_name=github.com%2Fzephyrproject-RTOS%2Fzephyr&per_page=100)). A count reflects scale and disclosure, not quality. ## Facts Every value below carries its source and our confidence. Facts are re-crawled on a freshness schedule. ### activity | Attribute | Value | Source | Retrieved | Confidence | |---|---|---|---|---| | activity.commits_last_30d | 100 | [link](https://github.com/zephyrproject-rtos/zephyr/pulse) | 2026-08-26 | 65% (medium) | ### adoption | Attribute | Value | Source | Retrieved | Confidence | |---|---|---|---|---| | adoption.github_stars | 16,315 | [link](https://github.com/zephyrproject-rtos/zephyr) | 2026-08-26 | 90% (high) | | adoption.dependent_repos | 0 | [link](https://packages.ecosyste.ms/api/v1/packages/lookup?repository_url=https%3A%2F%2Fgithub.com%2Fzephyrproject-rtos%2Fzephyr) | 2026-08-26 | 85% (high) | ### language | Attribute | Value | Source | Retrieved | Confidence | |---|---|---|---|---| | language.primary | C | [link](https://github.com/zephyrproject-rtos/zephyr) | 2026-08-26 | 90% (high) | ### license | Attribute | Value | Source | Retrieved | Confidence | |---|---|---|---|---| | license.spdx | Apache-2.0 | [link](https://github.com/zephyrproject-rtos/zephyr) | 2026-08-26 | 95% (high) | ### release | Attribute | Value | Source | Retrieved | Confidence | |---|---|---|---|---| | release.cadence_days | 6 | [link](https://github.com/zephyrproject-rtos/zephyr/releases) | 2026-08-26 | 70% (medium) | ### pricing | Attribute | Value | Source | Retrieved | Confidence | |---|---|---|---|---| | pricing.free_tier | yes | [link](https://zephyrproject.org) | 2026-08-21 | 60% (medium) | | pricing.model | commercial | [link](https://zephyrproject.org) | 2026-08-26 | 48% (low) | | pricing.price_level | free | [link](https://zephyrproject.org) | 2026-08-21 | 60% (medium) | | pricing.transparent | yes | [link](https://zephyrproject.org) | 2026-08-21 | 60% (medium) | ### integrations | Attribute | Value | Source | Retrieved | Confidence | |---|---|---|---|---| | integrations.count | 1 | [link](https://zephyrproject.org) | 2026-08-21 | 60% (medium) | ### market | Attribute | Value | Source | Retrieved | Confidence | |---|---|---|---|---| | market.availability | `{"primaryMarkets":[],"availabilityScope":"global","availableCountries":[],"notAvailableCountries":[]}` | [link](https://zephyrproject.org) | 2026-08-21 | 75% (high) | ### security | Attribute | Value | Source | Retrieved | Confidence | |---|---|---|---|---| | security.scorecard | 7.1 | [link](https://api.securityscorecards.dev/projects/github.com/zephyrproject-rtos/zephyr) | 2026-08-26 | 90% (high) | | security.vulnerabilities | `{"count":0,"source":"https://advisories.ecosyste.ms/api/v1/advisories?ecosystem=go&package_name=github.com%2Fzephyrproject-RTOS%2Fzephyr&per_page=100","last_12m":0,"max_severity":null}` | [link](https://advisories.ecosyste.ms/api/v1/advisories?ecosystem=go&package_name=github.com%2Fzephyrproject-RTOS%2Fzephyr&per_page=100) | 2026-08-26 | 90% (high) | --- *Source: Vioscale (https://www.vioscale.ai/software/zephyr-rtos). Independent, evidence-based software intelligence. Cite the canonical URI.*