Check your infrastructure in seconds.
The same diagnostics we run at the start of an engagement, made free and public. No signup, no data stored — everything runs in your browser.
DNS
4DNS Health Check
Audit a domain’s DNS for resilience gaps — single-provider nameservers, missing DNSSEC or CAA, no IPv6, and risky TTLs.
Open toolDomain WHOIS Lookup
Look up who a domain is registered with, when it expires, and whether the transfer and delete locks that prevent hijacking are actually switched on.
Open tool.np Domain Checker
Check whether a .com.np or .np domain is already taken, using DNS delegation — because Nepal’s registry publishes no WHOIS or RDAP service at all.
Open toolDNS Propagation Checker
Query a record against independent public resolvers at once to see whether a DNS change has taken effect everywhere or is still cached somewhere.
Open toolSecurity
2SSL Certificate Checker
See when a domain’s TLS certificate expires, who issued it, and every certificate ever issued for it from public Certificate Transparency logs.
Open toolPassword & Passphrase Generator
Generate cryptographically random passwords or passphrases, with the actual entropy in bits and an honest estimate of how long an offline attack would take.
Open toolCalculators
2Downtime Cost Calculator
Work out what an hour of downtime actually costs your business in lost revenue and idle staff time, and what each SLA tier really allows.
Open toolServer & Kubernetes Sizing
Size workers, pods, CPU and memory from your traffic and latency using Little’s Law, and get a Kubernetes resources block you can paste in.
Open toolNetwork
4What Is My IP
Your public IPv4 and IPv6 address, ISP, location, and everything your browser reveals about your device and connection.
Open toolInternet Speed Test
Measure download and upload throughput, latency and jitter straight from your browser. No app, no signup.
Open toolSubnet / CIDR Calculator
Work out network and broadcast addresses, usable host range, netmask and wildcard for any IPv4 CIDR block — and split a network into equal subnets.
Open toolReverse DNS Lookup
Find the PTR record behind an IPv4 or IPv6 address, and check the forward-confirmed match that mail servers require before they will trust a sender.
Open toolDeveloper
11Cron Expression Explainer
Translate a crontab expression into plain English and see the next five times it will actually fire, so a misplaced asterisk is obvious before it ships.
Open toolDeveloper Utilities
Four everyday conversions in one place: Base64 encode and decode, UUID v4 generation, SHA hashing, and Unix timestamp conversion.
Open toolJWT Decoder
Decode a JSON Web Token to inspect its header and claims, with expiry and timing checks in readable dates. Decoding happens locally — the token is never sent anywhere.
Open toolYAML ⇄ JSON Converter
Convert between YAML and JSON in either direction, with parse errors reported by line so a broken manifest is quick to find.
Open toolText Diff Checker
Compare two blocks of text or config and see exactly which lines were added, removed or changed, with a unified patch you can copy.
Open toolQR Code Generator
Generate QR codes from text or URLs with configurable size, error-correction level, and colours. Download as PNG or SVG.
Open toolImage Compressor
Compress images in your browser - no uploads. Choose format, quality and max dimensions. See before/after sizes.
Open toolFavicon Generator
Generate favicons from an image or text monogram. Output every standard size plus manifest and HTML snippets.
Open toolPDF Merge & Split
Merge multiple PDFs or split pages locally in your browser. No uploads, no server required.
Open toolMarkdown Preview
Live markdown editor with GitHub-Flavored Markdown, word count, and copy-to-clipboard HTML. Output is sanitised.
Open toolWCAG Contrast Checker
Check if a colour pair meets WCAG accessibility standards. Get a verdict for AA and AAA levels and suggestions for fixes.
Open toolNo signup
No account, no email wall, no credit card.
Nothing stored
Checks run in your browser. We never see the domains you look up.
Actually actionable
Every finding explains the risk and the fix, not just a pass or fail.