Servers by mike-tusa

Free SSL/TLS certificate checker: expiry, chain trust, hostname match, TLS version, A/B/C/F grade.

Parse a User-Agent: browser, OS, device, plus bot, search crawler, AI crawler and AI agent flags.

Check a domain's email authentication: SPF, DKIM, DMARC, BIMI, MX, MTA-STS, TLS-RPT. Score + fixes.

Scan a website's HTTP security headers (HSTS, CSP, framing, COOP/CORP, cookies). Score + fixes.

Disposable email checker: disposable, role, free-mail and look-alike flags. List-based, no MX.

Offline check-digit validation for IBAN, BIC, EU VAT, GTIN/EAN/UPC and ISBN. Format check only.

English profanity filter: find and censor swear words, incl. obfuscations. Word list, not AI.

Domain age and RDAP lookup: registration date, age, expiry, registrar, status and nameservers.

Repair broken JSON from LLM output and validate it against a JSON Schema.

Find meeting times that overlap working hours across IANA time zones, DST-aware. Free tier.

Check one web page for broken links, redirect chains hop by hop and mixed content. Free, no key.

Render 1200x630 Open Graph social preview images from templates; returns a cacheable PNG URL.

Offline phone-number validation and formatting (E.164, region, line type). No carrier lookup.

English readability scores (Flesch, Flesch-Kincaid, Fog, SMOG) and text stats. Text never stored.

Validate JSON-LD structured data against the Schema.org vocabulary. Free; never fetches URLs.

Business-day and public-holiday math for 29 countries: add business days, days between, holidays.