Add/subtract, count or find business days across countries and subdivisions; list public holidays. Bundled 2024–2030 calendars, inclusive ranges, explicit weekends and closures, source attribution and coverage warnings. See /calendar/coverage.

DNS lookup over DoH. Common record types (A, AAAA, MX, TXT, NS, CAA, ...) as clean JSON.

Email authentication posture for a domain: DMARC + SPF records fetched, parsed, scored 0-100, with findings and fix recommendations.

Fetch and parse robots.txt (+ llms.txt if present) into structured JSON, including which AI crawlers are blocked.

Fetch and parse sitemap XML or gzip into JSON. For an index, follow the first N children with ?follow=N. Caps merged output at 500 URLs.

QR code generator. Returns a crisp SVG for text/URL payloads up to 2,048 UTF-8 bytes that fit the selected error-correction level.

Inspect a public URL: HEAD redirect trace, DNS A/AAAA observations and security headers in one report. At most 4 targets, no page body. Includes timestamps, partial-result warnings and factual findings; no safety or reputation verdict.

VAT calculator for EU-27 + UK: net→gross or gross→net at standard or reduced rate. Includes rates table snapshot date.