Write to us

The fastest way is email: contact@ksefly.app. We usually answer within two to three working days.

Before you write, look at the frequently asked questions — the answer may already be waiting there. Data protection is covered by the privacy summary.

Reporting a bug? This helps

  • Your iOS version — Settings → General → About.
  • Your Ksefly version — in the app’s Settings, under "About".
  • The screen it happened on — "issuing an invoice", "the purchase list", "signing in".
  • What happened, and what you expected — step by step, if you can reproduce it.
  • A screenshot or a recording — if you can, with anything you would rather not send us covered up.

Never send us your KSeF token or any other credential. We will never ask for one.