Privacy

What this service stores, why, and how to get rid of it. Written to be read, not to be survived.

What we store

Your email address, so we can send a sign-in link and the alerts you asked for. A hashed sign-in token, so a session can be recognised without us keeping the token itself. For each check you create: its name, the optional client label and unit you type, the schedule and expectation you set, the time of each check-in, the last number reported, and running counts of arrivals and misses. If you subscribe, a Stripe customer identifier. If you add one, your Slack or Discord webhook URL.

What we do not store

We do not store the contents of your jobs, your code, your credentials, or anything the job sends beyond a single number. The check-in URL accepts a number and nothing else. We do not keep a log of individual check-ins, only the counters and the most recent arrival. We use no advertising, analytics or tracking cookies, and we do not sell or share data with anyone for marketing.

Who processes it

Cloudflare hosts the service and stores the database. Resend delivers our email. Stripe handles payment if you subscribe, and holds the card details; we never see them. Each of these is a processor acting on our instructions.

How long we keep it

Sign-in sessions expire 90 days after they are issued and are then deleted automatically. Check data stays until you delete the check or ask us to close your account. Delete a check and its record goes with it.

Your rights

You can ask for a copy of your data, a correction, or its deletion, and you can object to processing. Email the support address below and we will act on it. If you believe we have handled your data badly you can complain to your national data protection authority; in the Netherlands that is the Autoriteit Persoonsgegevens.

Client status pages

A client status link is public to anyone holding the URL. It shows only the checks for that one client: name, status, last arrival time, the last number reported, and the arrival and miss counts. It never exposes check-in URLs, your email address, your other clients, or any account control. Delete the link and the page stops working immediately.

Who runs this

Flatline is operated from the Netherlands by the individual who runs it, reachable at support@flatlineping.com. Write to that address for anything in this document, including a data request or a complaint, and you will get a reply from a person.

Last updated 23 September 2026.