DSquare Labs

Free IT tools that just work.

Practical, instant utilities built by our engineers — check your domain, email, SSL and website health, run networking and cost calculators, or get a rental estimate. All free, no sign-up required.

23 free tools and counting.

Email & Domain

DNS, email authentication and domain registration checks.

DNS Lookup

Check A, AAAA, MX, TXT, NS, CNAME and SOA records — plus SPF & DMARC email authentication — in one view.

New

Email Security Checker

Score your domain's protection against spoofing — MX, SPF, DKIM and DMARC — with clear fixes.

WHOIS Domain Lookup

Registrar, registration and expiry dates, status and nameservers for any domain, via RDAP.

DNS Propagation Checker

Compare A records across Cloudflare, Google, Quad9, OpenDNS and AdGuard to see how far a change has spread.

Reverse DNS (PTR) Lookup

Resolve a domain to its IPs and check each PTR record — important for mail-server reputation.

CAA Record Checker

See which certificate authorities are allowed to issue certificates for a domain.

Security & TLS

Certificates, security headers and credential tools.

SSL Certificate Checker

Verify your SSL/TLS certificate: issuer, validity, protocol, covered domains, and days to expiry.

New

Security Headers Checker

Grade a site's HTTP security headers — HSTS, CSP, X-Frame-Options and more — and see what's missing.

TLS Version & Cipher Checker

Discover which TLS protocols a server accepts and its negotiated cipher — flags deprecated TLS 1.0/1.1.

HTTPS & Mixed-Content Checker

Confirm HTTP upgrades to HTTPS, HSTS is sent, and no insecure http:// resources load.

Secure Password Generator

Generate strong, random passwords in your browser — adjustable length and character sets. Nothing leaves your device.

Hash & UUID Generator

Compute SHA-1/256/384/512 hashes of any text and generate random UUIDs, all client-side.

Website & SEO

Uptime, headers, metadata and search-readiness checks.

Flagship

IT Health Check

Instant, free assessment of your domain — DNS, email security, SSL, headers & registration, with a scored report and recommendations.

New

SEO & Social Preview

Analyse title, description, canonical, Open Graph and Twitter tags — with a live Google and social preview.

robots.txt & Sitemap Checker

Verify your robots.txt and XML sitemap exist, what they contain, and how crawlable your site is.

Uptime & Response Time

Check whether a site is up over HTTPS and how fast it responds — status, timing and server.

HTTP Header Inspector

View every HTTP response header a site returns — for debugging caching, security and redirects.

New

Internet Speed Test

Measure download, upload, latency, jitter and packet loss in your browser, powered by Cloudflare's edge.

Calculators & Estimators

Instant estimates for rental, cloud, support and networking.

Rental