Observed arrival · 2026-09-16

Invowerk, an e-invoice test bench

invowerk.dev Observed source

Editorial interest 78/100 Selection signal · not a rating of the site

A German-language service for validating, explaining, generating, and converting EU e-invoices, with a public API and KoSIT validation results.

Landing page captured for the 2026-09-16 issue.

Field notes

The service exposes invoice validation both as a public checker and as an HTTP endpoint that accepts an XML file in the request body. Its example calls /v1/validate with optional explanation and German-language parameters, then reads valid and findings from the JSON response. The homepage presents three monthly credit tiers—500 for the free plan, 2,000 for Essential, and 8,000 for Scale—and states that results use a KoSIT checker.

Observed signals

Read the marks

Editorial observations of this landing page, not a rating.

○OpenPublic substance visible

$PaidCommerce or pricing visible

✦PrettyNotable craft visible

●ProPolished or operationally mature

◎NicheUnusually specific use

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