The person behind Benno

Benno is built by Lars Müller — a software developer focused on artificial intelligence. By day, Lars builds AI applications at a German university hospital, where reliable, privacy-compliant technology is non-negotiable.

The idea for Benno came from a simple observation: while large companies have long put AI to work, hundreds of thousands of tradespeople and self-employed workers still write their invoices in Excel late at night — error-prone, time-consuming, and soon no longer legally compliant. Conventional invoicing software demands web dashboards, accounts and onboarding — exactly what there is no time for in the daily routine of a tradesperson.

Benno takes the opposite route: it meets tradespeople where they already are every day — on WhatsApp. A single voice message is enough, and the finished invoice — compliant with the German GoBD and ZUGFeRD e-invoicing standards — comes back as a PDF. No download, no login, no training.

Benno is subscription software (SaaS): free to start with 3 invoices a month, unlimited from €9.90 per month, and €14.80 for teams. No cut of your invoice amounts and no hidden fees — Benno is funded solely by these recurring subscriptions.

Benno is operated by Benno UG (haftungsbeschränkt), based in Düsseldorf, Germany. Data protection and legal certainty carry the same priority here as in the clinical environment Lars comes from: all data is processed within the EU, and voice messages are never stored permanently.