InvoiceNinja
Open-source solution for invoices, payments, and business management
About InvoiceNinja

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.
Why InvoiceNinja with WZ-IT?
We provide comprehensive consultation and support for implementing InvoiceNinja into your business processes. From installation to configuration and integration with existing systems and payment providers – we are at your side with our expertise.
With our Managed InvoiceNinja service, you can utilize all the benefits of this powerful platform without technical effort. We take care of installation, configuration, updates, backup, and security, allowing you to focus fully on your core business.
Professional Invoicing
Create and send unlimited invoices with real-time PDF preview, customizable templates, recurring invoices, and automatic reminder functionality.
Flexible Payment Options
Integration with numerous payment gateways like Stripe, PayPal, Braintree, Square, Mollie, and more for fast online payments and automatic status updates.
Quotes & Estimates
Create professional quotes that can be automatically converted to invoices upon approval, enabling a seamless sales process.
Project & Time Tracking
Manage projects with Kanban boards, track tasks and working hours, and convert them into invoice items with a single click.
Expense Management
Track expenses, import receipts, categorize costs, and bill them to clients if needed, with optional bank account integration.
Client Portal
Provide your clients access to a personalized portal where they can view invoices, make payments, and download documents.
Reports & Analytics
Gain detailed insights into your finances with revenue reports, client statements, aging cohorts, and customizable reporting options.
Extensive Customizations
Customize invoice designs, email templates, numbering sequences, and user permissions to match your specific business requirements.
Versatile Integrations
Connect InvoiceNinja with Zapier, Make, Pabbly, and other services for automated workflows and seamless integration into your existing tool landscape.
InvoiceNinja in Action

Experience InvoiceNinja in Action
See how simple and efficient InvoiceNinja works in practice. From installation to productive use.
Enterprise Managed Hosting
Enterprise Grade
Why Enterprise Managed Hosting?
With our Enterprise Managed Hosting for InvoiceNinja, you can fully focus on your core business. We provide you with an SLA, telephone support, and a personal contact who knows your infrastructure inside and out. Installation, configuration, updates, backups, and monitoring - all from one source.
Installation on Your Infrastructure
Looking for a custom solution?
We also offer customized InvoiceNinja Enterprise solutions for your specific requirements. Contact us for an individual quote.
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Industry-Leading Enterprises trust us
What do our customers say?

Sonja Aßer
Data Manager, ARGE

"With Timo and Robin, you're not only on the safe side technically - you also get the best human support! Whether it's quick help in everyday life or complex IT solutions: the guys from WZ-IT think along with you, act quickly and speak a language you understand. The collaboration is uncomplicated, reliable and always on an equal footing. That makes IT fun - and above all: it works! Big thank you to the team! (translated) "
Timo and Robin from WZ-IT set up a RocketChat server for us - and I couldn't be more satisfied! From the initial consultation to the final implementation, everything was absolutely professional, efficient, and to my complete satisfaction. I particularly appreciate the clear communication, transparent pricing, and the comprehensive expertise that both bring to the table. Even after the setup, they take care of the maintenance, which frees up my time enormously and allows me to focus on other important areas of my business - with the good feeling that our IT is in the best hands. I can recommend WZ-IT without reservation and look forward to continuing our collaboration! (translated)
We have had very good experiences with Mr. Wevelsiep and WZ-IT. The consultation was professional, clearly understandable, and at fair prices. The team not only implemented our requirements but also thought along and proactively. Instead of just processing individual tasks, they provided us with well-founded explanations that strengthened our own understanding. WZ-IT took a lot of pressure off us with their structured approach - that was exactly what we needed and is the reason why we keep coming back. (translated)
Robin and Timo provided excellent support during our migration from AWS to Hetzner! We received truly competent advice and will gladly return to their services in the future. (translated)

Over 50+ satisfied customers already trust our IT solutions
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Do you still have open questions? Are you unsure if and how we can help you? Don't hesitate to contact us and we will get back to you!