About
Quba-Viewer is a free, open-source e-invoice viewer that also runs on Windows and Linux. It displays electronic invoices in a visual, human-readable form, so you can check their content and semantics.
Version 1.5.0 added support for ZUGFeRD 1 invoices, a search function, and a manual. Version 1.5.1 fixed several smaller issues and was the first release where the auto-update feature worked.
Quba 2.0 is described as an open-source, offline e-invoice viewer. The project has also said that Quba 2.0 will be able to validate and create e-invoices, not only display them.
What's new
All release notes2.0.0Oct 25, 2026
Homebrew cask quba 2.0.0 (sha256 3f0ab1ad76c6ca94e686b0eb5cf0f1f9888c4756e90bb3ec5cd2f46d294c6d7e).