api-diff

Compare OpenAPI specs and find potential affected JS, TS, and Python callers. Offline, zero runtime dependencies, with a one-command demo.

Swagger UI plugin that highlights API changes inline: added, deleted, and updated operations, parameters, responses, and schema properties are marked directly in the Swagger UI, without leaving the docs.

Fast API compatibility reports for Go projects

Git diff for your API responses.

A macOS app and command line tool for finding out what's new in Apple's SDKs, release by release.

OpenAPI breaking change detection CLI | API contract testing | prevent API breaking changes in CI/CD

GitHub Action: catch breaking API changes on every PR. Posts severity-graded comments with migration guides. 28 detection types.

API contract governance in one tool: breaking-change rules, runtime drift detection, schema-driven fuzzing, traffic replay and performance budgets for OpenAPI, Swagger 2.0, AsyncAPI, GraphQL, gRPC, MCP tool manifests and WSDL.

API contract visualization tool that reconciles frontend intent, backend implementation, and runtime behavior — surfacing mismatches across your system boundaries.

Office.js CDN monitor: sees new builds rolling out across edges and diffs the public API surface

🛡️ Automated API diffing and breaking-change detection for NestJS and Swagger.

Distill a Swift package to its public API: a compact interface to read, snapshots to query and diff.

CLI for detecting client-breaking changes between OpenAPI JSON contracts (3.x), with actionable CI and Markdown reports.

Ready-to-use API monitoring configurations for Rumbliq — detect schema drift in third-party APIs

Fork, push, and see Delimit catch breaking API changes in CI. Try it in 2 minutes.

Git diff for API behavior — capture, compare, and detect breaking changes in JSON APIs.

Detect breaking API changes before production with deterministic JSON/API contract diffing, risk scoring, and optional AI impact analysis.

Compare two OpenAPI 3 documents and categorize changes as breaking/non-breaking with JSON paths. Zero deps.

Catch breaking changes in your MCP server before your users' agents do — contract snapshots, schema-aware diff, tool-poisoning (description change) alerts and a sticky-PR-comment GitHub Action.