Compare two OpenAPI specs side-by-side to detect breaking changes, new endpoints, removed fields, and modified schemas between versions. Everything runs locally in your browser — nothing is uploaded.
Generate Markdown API documentation from OpenAPI specs. Create clean, readable docs with endpoints, parameters, and response examples.
Generate structured changelogs from API version diffs. Categorize changes as Added, Changed, Deprecated, Removed, Fixed, or Security.
Generate mock API responses from OpenAPI spec fragments. Create realistic sample data for API development and testing.
Calculate A/B test significance between two variants. Compare conversion rates with visitor and conversion data for each variant. Everything runs locally in your browser — nothing is uploaded.
Performs pixel-level and text-level comparison of two PDF files, highlighting every difference with color-coded overlay annotations. Everything runs locally in your browser — nothing is uploaded.
API Diff Checker lets you compare two OpenAPI specs side-by-side to detect breaking changes, new endpoints, removed fields, and modified schemas between versions. Everything runs locally in your browser — nothing is uploaded.. It works on any device with a modern web browser.
Compare two OpenAPI specs side-by-side to detect breaking changes, new endpoints, removed fields, and modified schemas between versions. Everything runs locally in your browser — nothing is uploaded. It runs entirely in your browser — no software installation or data uploads required.
Enter one or more URLs to analyze.
Yes. After the initial page load, API Diff Checker runs entirely on your device with no internet connection needed. All processing is done locally.
Compare two OpenAPI specs side-by-side to detect breaking changes, new endpoints, removed fields, and modified schemas between versions. All processing runs locally — no code is sent to any server.
Tools cover JavaScript, CSS, HTML, SQL, Python, JSON, XML, CSV, and more. Check the tool description for specifics.
Yes. Since processing is local, performance depends on your device. Most operations handle large files without issue.
Yes. Formatters use well-known libraries (sql-formatter, Prettier-compatible patterns) and follow widely adopted rules.
OpenAPI Validator
Validate OpenAPI/Swagger spec syntax. Check for required fields, missing paths, and structural issues in your API specification.
API Changelog Generator
Generate structured changelogs from API version diffs. Categorize changes as Added, Changed, Deprecated, Removed, Fixed, or Security.