No. 20 of 23 ·API Governance Software

Zally

Web · Windows · Mac · Linux · Self-hosted · API

Freedom report

Two barsScore 5.4

Zally is ranked #20 of 23 in API governance software on Freedom251. It runs on API, Linux, macOS, Self-hosted, Web, Windows. There is a free plan.

Zally plans and pricing

Open source Free MIT license with an exception · API linter github.com · 8 Oct 2026

Purpose: Zally is an API linter and quality assurance tool for OpenAPI specifications.
OpenAPI support: It supports OpenAPI 3 and Swagger OpenAPI 2 specifications.
Interfaces: Zally provides a RESTful API, a CLI, and a web interface.
Guidelines: Its standard configuration checks APIs against Zalando’s RESTful Guidelines, and the project says it can also be used out of the box by others.
Customization: Users can enable or disable server-side rules, configure some existing rules, and implement custom rules in Kotlin.
Rule exceptions: The x-zally-ignore extension lets an API definition disable rules for that API.
Local deployment: The project README says the web UI, server, and database can be started together with Docker Compose.
Integrations: The README lists an unofficial Zally Maven Plugin integration.
Security reporting: The repository security policy says vulnerability reports can be submitted through Zalando’s form and that its HackerOne bug bounty program is private.
License: The project is offered under an MIT license with an exception.
Support: The project invites users to join its Gitter room or contact maintainers directly.
Maintainer: The project site says Zally is maintained by Zalando.
Specification support: It supports OpenAPI 3 and Swagger OpenAPI 2 specifications.
Web UI: The web UI lists implemented rules and can lint external files and API definitions in its online editor.
Price from: Free

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