Invoicing software for Windows: offline, no subscription.

No. Zyloft Desk runs on Windows 10 and 11 only. A Mac version is not currently planned.

No, and that's on purpose. Your data lives only on your PC. To move it to another computer, you use an encrypted backup.

Not for day-to-day work: you manage clients, quotes and invoices offline. You need the internet for activation, updates and the licence check. Zyloft Desk confirms the licence online at startup and keeps working for up to 7 days without a connection; after that it has to go online once. Your client and invoice data is not sent.

Zyloft Desk supports you with key requirements: issued invoices are locked, corrections go through cancellation invoices, and invoice numbers are gapless. There is no official GoBD certification for software. Whether your bookkeeping as a whole meets the GoBD also depends on your processes, your record keeping and your process documentation. If in doubt, check with your tax advisor.

Yes. In Kleinunternehmer mode, Zyloft Desk issues invoices without VAT and adds the notice required under §19 UStG. Please check with your tax advisor whether the small business rule applies to you.

Since 2025, businesses in Germany must be able to receive e-invoices from other businesses. For issuing invoices there are transition periods: until the end of 2026, paper and PDF invoices to business clients are still allowed. With prior-year revenue of up to €800,000, this applies until the end of 2027. From 2028, all businesses must issue e-invoices to domestic business clients. Zyloft Desk creates ZUGFeRD and XRechnung invoices for this. Please check with your tax advisor what applies in your case.

In an SQLite database on your own PC. None of it is sent to us or to third parties. To keep it safe, you create encrypted backups and store them, for example, on a USB stick or a drive of your own.

Your data stays with you. Invoices are available as PDFs and you can export the VAT figures as CSV. Remember that you usually have to keep invoices and receipts for eight years in Germany, so keep your backups too.

Yes. The first year of updates, including changes for new tax requirements, is included in the price and installs through the built-in updater. After that, you can keep getting updates with the optional update package for €59 a year. Without it, your version keeps working but gets no new features or adjustments.

After payment, Polar emails you your receipt and a link to its customer portal. There you download the installer and find your licence key. Install Zyloft Desk on your Windows PC and enter the key to activate it.