Free, no sign-up
Free tools for websites and servers
The checks behind Uptimecheck, one at a time. Use them as often as you like; when you want to know the moment something changes, a monitor runs the same check for you.
- Is it down? Check whether a website answers, how fast, and when its certificate expires. Open tool
- Cron expression explainer Paste a crontab schedule to read it in plain English and see the next times it runs on a server in your time zone or in UTC. Open tool
- SSL certificate checker See whether a site's certificate is valid, when it expires, who issued it, which names it covers and the full chain, checked from Stockholm. Open tool
- SPF, DKIM and DMARC checker Check a domain's SPF, DKIM and DMARC records, MTA-STS and TLS reporting in one go, with what to fix and the exact record to add. Open tool
- Domain expiry checker Look up a domain's expiry date, registrar and age from the registry's own records (RDAP, or WHOIS where there is none). Open tool
- DNS lookup Ask for any record type and see every answer with its TTL, straight from a resolver, without a cache in between. Open tool
Downtime is obsolete.
Set up your first monitor in under a minute, or look around the live demo first.
14-day free trial · No credit card required