Kontier

Kontier helps businesses automate subscription, seat-based and usage-based billing. Product and engineering teams manage catalogs, versioned prices, metered usage, proration and multiple currencies through a REST API and signed webhooks. Finance and operations teams use a web dashboard.

The platform supports EU VAT and reverse charge, XRechnung and ZUGFeRD e-invoices, automated dunning, payment collection through Stripe and GoCardless, and DATEV CSV exports. Kontier integrates with payment providers and does not itself act as a payment processor.

Developed in Germany by Frontier Algorithmics UG (haftungsbeschränkt), Kontier offers EU-hosted cloud plans and an on-premise option. Starter and Scale plans include a 14-day trial. The product is designed for startups, SMEs and enterprises that need subscription or usage billing connected to European invoicing requirements.