Sereno

Privacy

What Sereno keeps about you, for how long, and who else handles it. Last updated October 25, 2026.

Sereno is run by Diego Fernandez, operating Sereno. Write to [email protected] with any question.

What Sereno keeps

  • Your email address.
  • Your checks and projects.
  • Your jobs' reports, with what each job printed. Secrets Sereno recognizes are replaced with [hidden] before they're saved. Each report also keeps the internet address and the program name it came from.
  • Your alert history.
  • Your agent connections, where each one connected from, and what each one changed.
  • Internet addresses and email addresses, to limit abuse such as too many sign-in emails.

How long

  • Run history, alerts and what agents changed: 90 days.
  • Sign-in records, counts of codes sent, and connection codes that were never used: a day. A sign-in code works for 15 minutes.
  • Where a connection came from and which app it is: until your account is deleted.
  • An agent's access: until it runs out or you disconnect it. An app's access lasts 60 minutes at a time and stops after 90 days unused. A connection made from a terminal lasts until you disconnect it.
  • Everything else: until you delete your account.

The server's nightly backups keep deleted data for up to 14 days, and then it's gone. Sereno's own nightly copy is replaced every night.

Where it's stored, and who handles it

Sereno runs on a server in Germany. These companies handle data for it:

  • Cloudflare: the network in front of Sereno, the human check on the sign-in form, and backup storage.
  • Hetzner, a German company: the server itself.
  • Resend: the emails Sereno sends.
  • ntfy.sh: phone alerts, if you turn them on.
  • PostHog: counting visits to Sereno's public pages.

Cloudflare and Resend are US companies. Both are certified under the EU-U.S. Data Privacy Framework, and their data agreements add standard contract clauses as a fallback. PostHog is a US company too, and its data agreement uses standard contract clauses.

Counting visits

Sereno counts visits to its public pages (the home page, the docs, the terms and this page) with PostHog. It sets no cookies and stores nothing in your browser. PostHog tells visitors apart for one day by a scrambled mix of your internet address and browser, then drops the address and the browser's full description. What it keeps is the page, the time, the site you came from, your country, and the kind of browser and device. Pages that need you to sign in, like your dashboard, are never counted.

Sereno shows no ads and never sells your data.

Why

Sereno keeps this data to run the service you asked for: watching your jobs and telling you when one breaks. That's its legal basis under the European privacy rules (GDPR). The internet and email addresses kept to limit abuse rest on a second basis: Sereno's legitimate interest in keeping the service safe for everyone. Counting visits rests on the same basis: knowing which pages people read.

Your rights

You can ask to see your data, correct it, delete it, or take a copy with you. Write to [email protected]. You can also complain to a data protection authority, such as the one where you live.

Deleting your account

Go to Settings, then Delete account. It's immediate. For a copy of your data first, write to [email protected].

Age

You must be 16 or older to use Sereno.