astrina
No account needed for most of them

All 148 utilities

77 of them run entirely in your browser — nothing is uploaded and nothing is counted.

148utilities
77run in your browser
32also over the API
9categories

Security 13

Certificates, DNS, headers and mail authentication.

Password strengthComplexity and time to crack. Stays local. ⚡ SSL checkerCertificate, chain and expiry. API Security headersHSTS, CSP, frame options, graded. API HTTP headers analyserEvery response header, explained. API CSP analyserNames the directives that leave a hole. API DNS lookupA, AAAA, MX, NS, TXT, SOA and CAA. API WHOIS lookupRegistrar, dates and nameservers. API Email deliverabilitySPF, DKIM and DMARC records. API HTTP/2 and BrotliWhich protocol and compression is used. API IP infoGeolocation and network for an address. API Open portsWell-known service ports, checked safely. API Cookie analyserCookies and their flags against GDPR. API CORS checkerWhich origins your endpoint allows. API

How the plans divide these up.

Opening a tool is not what costs us anything — volume is. Every tool that runs in your browser is free to everyone, forever, with no counter. What the plan decides is how much one run may cover, how many server-side runs you get a day, and whether results are kept, exported, scheduled or reachable from the API.

  • We do not run other people’s code. One tool on comparable lists is an online PHP editor that executes what you paste; Astrina formats PHP and reports syntax errors, and nothing is ever executed.
  • Tools that fetch a page identify themselves honestly and obey robots.txt.
  • Anything processed in your browser stays there — files are never sent to us.
See the table → API access

People found this page by these searches

Real queries from Search Console for this address.

What this page answers