Math & Numbers
Calculate antilogarithms for any valid base and optionally verify the result by applying the logarithm again
antilog-calculatorDevelopment
Calculate CSS selector specificity scores, compare multiple selectors, and get suggestions for avoiding cascade conflicts
css-selector-specificity-calculatorDeveloper Tools
Visualize JSON or JSONL as an expandable tree and copy JSONPath expressions for every node
json-path-visualizerDevelopment
Compare two API response payloads, highlight field-level diffs, and classify likely functional changes versus harmless runtime drift
api-response-diff-semantic-analyzerText Processing
Translate full Markdown articles with AI while preserving headings, tables, links, images, and code blocks for direct publication
ai-markdown-article-translatorDevelopment
Generate pure CSS masonry-style layouts with responsive breakpoints, configurable gaps, and optional full-width skip selectors
css-masonry-layout-generatorDevelopment
Mutate OpenAPI request fields into semantically risky variants and optionally send them to a real backend to check defensive validation coverage
api-contract-mutation-testerSecurity
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-validatorDate & Time
Expand RRULE-based VEVENT recurrence into concrete occurrences and export them as JSON or a flattened ICS calendar
ics-calendar-recurrence-rule-expanderDevelopment
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-tool