Small, focused tools built from the same checks okokumo runs on a schedule — free, no account, nothing stored.
Each of these runs the same logic our paid monitoring uses, exposed as a one-off check rather than something running every minute on your behalf. No account, no email address, nothing you type in kept after the response comes back. If a tool below turns out to be something you would rather have running continuously, that is exactly what the product does.
Opens a TLS connection to a domain you name and reports what it actually serves: expiry date, days remaining, issuer, chain validity and handshake time. Useful the moment a customer asks "is your certificate broken?" and you want an answer that does not depend on your own browser's cache.
Paste a cron expression and see what it actually means: which fields are which, the next 8 times it fires, and the traps that catch people — the day-of-month/day-of-week OR rule, and what happens to a schedule that lands on a daylight-saving change. Runs entirely in your browser.
Looks up when a domain's registration expires, who it is registered with, and whether it still resolves — three things that fail on different days and for different reasons. An expired domain takes the website, the API and every email address with it, and the renewal notice usually goes to someone who has left.