Free tools for developers
We build website monitoring for a living, so we end up making little tools along the way. Here are a few we think you'll find handy. They're free, and none of them need a signup.
DNS lookup
See every DNS record for any domain: A, AAAA, MX, TXT, and more, with a plain-English explanation of what each one does.
🪞Request Mirror
Send any HTTP request and see exactly what arrived. Good for debugging webhooks, API clients, redirects, and status codes.
📡Website down checker
Check whether a website is down for everyone or just you, live from six locations around the world.
⏱Cron expression generator
Build a cron schedule, read it in plain English, and preview upcoming run times in your chosen timezone.
🔒SSL expiry checker
Find out when your SSL certificate expires, which domains it covers, and whether its TLS connection can be verified.
↪️Redirect checker
Follow every redirect, see each status code and destination, and spot loops or broken destinations before your visitors do.
🔔DNS watch
Watch a DNS record for seven days and get an email when its values change. Confirm your email to start, no account needed.
