Security
Inject visible or signature-style watermark fields into CSV or JSON exports so shared datasets can be traced later
csv-json-data-watermarkerDevelopment
Validate a real API response JSON against the response schema declared in an OpenAPI 3.x specification
api-response-contract-validatorDevelopment
Compare two OpenAPI 3.x schemas, identify breaking changes, grade client impact, and suggest migration or compatibility strategies
api-breaking-changes-detector-migration-plannerData Processing
Compare two CSV or XLSX datasets and export a PDF report with row, column, and cell-level differences
csv-excel-diff-toolDevelopment
Simulate the next runs of one or two 5-part cron expressions, highlight overlaps, and warn about overly dense schedules
cron-job-simulatorDesign
Measure WCAG contrast, simulate major color-vision deficiencies, and optionally flag low-contrast regions in a UI screenshot
color-vision-accessibility-checkerDevelopment
Generate boundary-value test cases from an OpenAPI 3.x document and optionally send them to a real backend to spot contract mismatches
api-contract-stress-testerMath & Numbers
Convert bytes to megabytes using the decimal MB standard with configurable precision
byte-to-mbMath & Numbers
Convert Celsius to Fahrenheit with configurable decimal precision
celsius-to-fahrenheitDevelopment
Parse cron schedules, validate standard or Quartz syntax, and visualize the next execution times on a timeline and grouped calendar view
cron-expression-visualizerDevelopment
Generate polished API documentation from OpenAPI or annotated comments
api-doc-generatorDevelopment
Measure cyclomatic and cognitive complexity across multiple programming languages
code-complexity-analyzer