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Compare two texts line by line using an LCS diff: exact additions, removals and context — in unified-diff style. Determ…Docs not supplied

Parse a semantic version into major/minor/patch/prerelease, test it against a SemVer range (^, ~, >=, *) and compare tw…Docs not supplied

Fetch the live gas price from public RPC nodes on Base or Ethereum: wei per unit gas, converted to gwei, with a USD est…Docs not supplied

Turn a cron expression into plain English, validate it, and compute the exact next execution times. Deterministic — the…Docs not supplied

Compute a CVSS 3.1 base score from its vector string using the exact FIRST specification (weights, scope handling, and …Docs not supplied

Calculate the API cost of an LLM call: input and output tokens × published per-million prices for 15 current models (Op…Docs not supplied

Convert YAML to JSON and JSON to YAML — the config-format bridge for CI files, Kubernetes manifests, docker-compose, ag…Docs not supplied

Geolocate any IPv4/IPv6 address (or the caller's own IP when omitted) via ipwho.is: country, region, city, coordinates,…Docs not supplied

Encode text to base64 or decode base64 back to text. Full UTF-8 support including emoji and non-Latin scripts. Use this…Docs not supplied

Reference database of HTTP response status codes with phrase, category and explanation. Look up a specific code or list…Docs not supplied

Query the Internet Archive's Wayback index for any URL: when it was first archived, the most recent snapshot, how many …Docs not supplied

Validate an email address in two layers: strict RFC-style syntax, then a live DNS MX lookup on the domain to confirm th…Docs not supplied