Free tools
Free website checkers
One-off checks with no account. For checks every minute from several locations with alerts, add a monitor.
Website down checker
Check if a website is down for everyone or just you: status code, response time, redirects, server and Cloudflare, checked live from our server. Free, no sign-up.
SSL checker
Check any site's SSL certificate: when it expires, days left, who issued it, which names it covers, and whether browsers trust it. Free, no sign-up.
Domain expiry checker
Look up when a domain expires, how many days are left and who the registrar is, straight from the registry (RDAP or WHOIS). Works for .com, .rs, .de, .eu and more. Free.
Ping and port checker
Ping a host online and check if a port is open: four TCP connects with min, average and max time, from our server. Works where ICMP is blocked. Free, no sign-up.
For scripts and AI agents
Every tool is also a JSON endpoint with no key (30 checks per minute per IP), and an MCP tool at https://uptime.rs/mcp.
curl "https://uptime.rs/api/v1/tools/website?host=example.com" curl "https://uptime.rs/api/v1/tools/ssl?host=example.com" curl "https://uptime.rs/api/v1/tools/domain?host=example.com" curl "https://uptime.rs/api/v1/tools/ping?host=example.com&port=443"