Free SSL/TLS certificate checker: expiry, chain trust, hostname match, TLS version, A/B/C/F grade.
Free
8 servers across security & testing, email, web, search & scraping, developer tools & repos, content management and productivity & workflow. The largest is CertGuard.
Security & Testing · Email · Web, Search & Scraping · Developer Tools & Repos · Content Management · Productivity & Workflow
8
servers published
6 categories
—
installs
across every listing
0
followers
told when a release lands
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average rating
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8 MCP servers. 8 of 8 are free to start.
Check a domain's email authentication: SPF, DKIM, DMARC, BIMI, MX, MTA-STS, TLS-RPT. Score + fixes.
Free
Domain age and RDAP lookup: registration date, age, expiry, registrar, status and nameservers.
Free
Scan a website's HTTP security headers (HSTS, CSP, framing, COOP/CORP, cookies). Score + fixes.
Free
Offline phone-number validation and formatting (E.164, region, line type). No carrier lookup.
Free
English readability scores (Flesch, Flesch-Kincaid, Fog, SMOG) and text stats. Text never stored.
Free
Parse a User-Agent: browser, OS, device, plus bot, search crawler, AI crawler and AI agent flags.
Free
Business-day and public-holiday math for 29 countries: add business days, days between, holidays.
Free
Authentication
0 of 8 use OAuth
The rest either hold an API key issued by the publisher or ask for nothing.
Support
Community publisher
Listed without a verification tick. Read the listing before installing.