- Unit CalculatorA calculator that understands units and currencies, so 3 ft + 4 in to cm just works.unit calculatorconvert unitscurrency converternumbat alternative
- GPU InspectorInspect your browser's WebGPU adapter, its supported features, and its limits.webgpu inspectorgpu adapter infowebgpu limitswebgpu features
- MCP InspectorBrowse an MCP server's tools and schemas, read its responses, and build test calls.mcp inspectormcp server toolsmcp tools listjson-rpc mcp
- Speculation Rules BuilderBuild and validate prerender and prefetch rule sets for the Speculation Rules API.prerender rulesprefetch ruleschrome prerender
- URLPattern TesterTest route patterns against URLs and inspect every matched group.urlpattern testerroute pattern testnamed route groupsurl matching
- UUID GeneratorGenerate RFC 9562 UUIDs on your own device: v4 random or v7 time-ordered, one at a time or a thousand at once, upper or lower case.uuidguiduuid v4uuid v7
- WebAssembly Feature CheckTest which post-MVP WebAssembly proposals, like SIMD, threads, and garbage collection, your current browser actually supports.wasm feature checksimd wasm support
- WASM InspectorRead a WebAssembly module's sections, imports, exports, and post-MVP features in your browser.wasm inspectorwasm sectionsanalyze wasm file
- Glob Pattern TesterCheck file paths against a glob pattern and see which ones match.test glob patternglob to regexglobstar tester
- JSONPath QueryRun a JSONPath expression against pasted JSON and see every match and its path.jsonpath queryjsonpath testerjson path finder
- Regex TesterTest a regular expression with live match highlighting, capture groups, a replace preview, and a plain English explanation of the pattern.regex testerregex onlinetest regex patternregex explainer
- Semver Range TesterCheck whether a version satisfies a semver range, with plain English rules.semver satisfiessemver comparator
- Unified Diff and Patch ApplierApply a unified diff patch to pasted text and preview the result before download.apply patch onlineapply diff to textgit apply onlinereverse a patch
- XPath and CSS Selector TesterTest XPath expressions and CSS selectors against pasted HTML and see every match with its path and text.xpath testerxpath evaluator