InvoiceNinja is a powerful open-source software for invoicing, online payments, expense tracking, and project management. The platform is specifically designed for freelancers and small businesses, offering all the tools needed for professional financial and business management.
Trusted by leading companies
InvoiceNinja is a powerful open-source software for invoicing, online payments, expense tracking, and project management. The platform is specifically designed for freelancers and small businesses, offering all the tools needed for professional financial and business management.
As an experienced InvoiceNinja partner, we support you in installing, configuring, and customizing this versatile business solution to your individual requirements. Leverage the benefits of automated invoicing and professional client communication for your business.
We install, host and operate InvoiceNinja for your company - either on our secure, GDPR-compliant infrastructure in Germany or other locations, as well as on-premise in your own environment.
With 24/7 monitoring, enterprise support, backups and professional maintenance, we ensure maximum availability and reliable operation of your InvoiceNinja instance.
Create and send unlimited invoices with real-time PDF preview, customizable templates, recurring invoices, and automatic reminder functionality.
Integration with numerous payment gateways like Stripe, PayPal, Braintree, Square, Mollie, and more for fast online payments and automatic status updates.
Create professional quotes that can be automatically converted to invoices upon approval, enabling a seamless sales process.
Manage projects with Kanban boards, track tasks and working hours, and convert them into invoice items with a single click.
Track expenses, import receipts, categorize costs, and bill them to clients if needed, with optional bank account integration.
Provide your clients access to a personalized portal where they can view invoices, make payments, and download documents.
Gain detailed insights into your finances with revenue reports, client statements, aging cohorts, and customizable reporting options.
Customize invoice designs, email templates, numbering sequences, and user permissions to match your specific business requirements.
Connect InvoiceNinja with Zapier, Make, Pabbly, and other services for automated workflows and seamless integration into your existing tool landscape.
See how simple and efficient InvoiceNinja works in practice. From installation to productive use.
Professional installation on your infrastructure – on-premise, cloud or hybrid
In your data center
AWS, Azure, Hetzner & more
High-availability setup with comprehensive security and compliance features
Secure access and access control for your installation
WireGuard, NetBird or Tailscale
Keycloak, Authentik, Azure AD
TOTP, WebAuthn, YubiKey
Fail2Ban, Rate Limiting, IP Whitelisting
We set up secure VPN access to your installation – ideal for remote work and external employees.
Full-service installation with no hidden costs
InvoiceNinja is powerful, but German requirements (ZUGFeRD, special layouts) are often tricky. We use the Laravel foundation for customizations beyond the UI.
We integrate invoicing completely invisibly into your app. Your system fires an API call, InvoiceNinja creates, sends, and reminds the invoice fully automatically.
Invoice paid? We use webhooks to unlock the service in your system, trigger shipping, or send a 'Thank You' SMS to the customer.
The standard editor has limits. We code PDF templates directly in HTML/CSS/Blade. Pixel-perfect implementation of your stationery, conditional texts (EU Reverse Charge), and dynamic QR codes.
How we implement InvoiceNinja development in practice.
The tax advisor needs data in a specific CSV/XML format that InvoiceNinja does not natively export.
An external script that pulls all new invoices monthly via API, maps account assignment information, and generates a DATEV-compliant export file.
Billing is based on usage, not fixed prices. Standard recurring invoices cannot handle this.
A cronjob service that aggregates usage data from your app at month-end and generates an invoice with dynamic line items in InvoiceNinja via API.
Customers should not be redirected to an external URL (invoice.domain.com) for invoices and payments.
Integration of the client portal via IFrame or API into your own login area. Seamless UX without media breaks.
Open source enterprise-ready for productive workloads - we run your applications with highest security standards and enterprise support
Open source software for business-critical processes requires professional maintenance, continuous updates, and enterprise-grade support. With our InvoiceNinja Enterprise Managed Hosting, you get the necessary infrastructure and support to reliably operate open source in production environments. Backups, SLAs, telephone support, and personal contact - so you can focus on your core business.
We also offer customized InvoiceNinja Enterprise solutions for your specific requirements. Contact us for an individual quote.
Good choice – we'll help you get started or with operations.
As a Managed Service customer at WZ-IT, you have access to our exclusive portal: Monitor your infrastructure in real-time, schedule maintenance, request quotes, and get direct support – all in one central location.
These solutions are often used together with Invoice Ninja
These solutions offer similar functionalities and can be evaluated together
Whether a specific IT challenge or just an idea – we look forward to the exchange. In a brief conversation, we'll evaluate together if and how your project fits with WZ-IT.
Trusted by leading companies
Timo Wevelsiep & Robin Zins
CEOs of WZ-IT
