No. 19 of 23 ·API Governance Software

API Validator

Web · Self-hosted

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Freedom report

One barScore 5.4

Free tierNo free tier on record
Open codeNo open-source code on record
Runs widely1 of 6 device platforms
DocumentedPlans, terms and facts published

API Validator is ranked #19 of 23 in API governance software on Freedom251. It runs on Self-hosted, Web.

Compared on API governance software

Free plan: Yes
Style guide enforcement: Yes
API linting: Yes
Governed API formats: OpenAPI 3.x, Swagger 2.0, AsyncAPI, Arazzo, JSON Schema
CI/CD integration: No

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The record

Purpose: API Validator lints API descriptions against a Spectral-powered governance ruleset in the browser.
Supported formats: It supports OpenAPI, AsyncAPI, Arazzo, and JSON Schema.
Artifact search: Users can search GitHub, GitLab, and Bitbucket for artifacts using their own tokens, or upload a file from disk.
Editing: The editor uses Monaco and supports switching between YAML and JSON.
Rules: Users can adjust a finding’s severity, message, or description, or disable its rule; saved overrides persist in the browser.
Documentation: The tool can generate documentation for the current artifact and download it as HTML or Markdown.
Transformations: Utilities include bundling $refs, componentizing, splitting by tag, channel, or workflow, and migrating JSON Schema drafts.
Save and publish: Documents autosave to browser local storage, can be assembled into an APIs.json 0.21 index, and can be committed or submitted as a pull request to a repository.
Privacy: The maker says the app has no backend or accounts and that tokens and documents stay in the browser.
Offline use: The entire app can be downloaded as a single self-contained file for local use.
Limits: The maker describes its scope as deliberately limited to four artifact types.
Pricing and licensing: The project is open source and free to fork; API Evangelist offers expert governance services for users who want help.
Maker: API Validator is a project of API Evangelist and is maintained under API Commons.
Lint engine: It uses the Spectral engine, with built-in Spectral rulesets for OpenAPI and AsyncAPI and curated inline rules for Arazzo and JSON Schema.

Where it ranks on Freedom251

Best API Governance Software in 2026#19 of 23

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Sources

validator.apicommons.org· checked 7 Oct 2026
github.com/api-commons/api-validator· checked 7 Oct 2026