How to Build Your Own Invoice Ninja
Replace Invoice Ninja with a custom build. Free Invoicing Software for Small Businesses
Build Difficulty: 4/5
A few focused days to build a solid replacement
Estimated Timeline
Based on 71 features at Few Days difficulty, expect about 3-5 days with AI-assisted development.
Recommended Tech Stack
Full-stack React framework with API routes and server components
PostgreSQL database, auth, and real-time subscriptions
Utility-first styling for rapid UI development
Payment processing, subscriptions, and invoicing
Key Features to Replicate
Top features across 8 categories. See all 71 features
Invoicing(12 features)
Automatic sales tax calculation for US states (available in Pro tier and above)
Fully customizable invoice design with ability to create unique custom fields and layouts
Support for electronic invoicing in UBL format and PEPPOL network for compliant e-invoicing
4 free professional invoice templates, with 11 templates in Pro/Enterprise plans. 100% customizable designs
Create and manage a library of products and services for quick selection when invoicing
+7 more in this category
Integration(6 features)
RESTful API for integrating Invoice Ninja with third-party applications and custom workflows
Connect Invoice Ninja with apps through Integrately integration platform
Advanced workflow automation through Make.com (formerly Integromat) platform
Integration with Pabbly for workflow automation and app connections
Integrate with hundreds of apps via automation platforms like Zapier, n8n, Make, and Integrately
+1 more in this category
Payments(6 features)
Automatically add credit card fees as a percentage or flat rate within predetermined price ranges
Create custom payment instructions to display on invoices and client portal
Accept partial payments and deposits with automatic invoice updates as payments are received
Accept credit cards, ACH, PayPal, and other payment methods with one-click payment processing
Enable clients to pay extra (tipping) or set minimum payment requirements for payment scheduling
+1 more in this category
Client Management(5 features)
Create unique settings and rules for different groups of clients
Password-protected client-side portal allowing clients to view invoices, quotes, payments, documents, and transaction history
Free tier includes 5 clients, Pro tier and above include unlimited clients
Create multiple contacts within each client record to ensure correct people receive invoices
Define multiple locations or shipping addresses per client to display on invoices as needed
Communication(5 features)
Quickly select multiple invoices and quotes to email out together in bulk
Configure custom SMTP server for sending invoices and communications via own email domain
Send invoices, quotes, and payment reminders via email with customization options
Send invoices and quotes directly through Gmail or MSN accounts for branded email experience
Automatically attach invoice PDFs to outgoing emails
Branding(4 features)
Full white-label client portal with custom branded URL like 'Billing.YourCompany.com'
Upload and brand invoices with your company logo to match business branding
Create branded invoice portal URLs like 'YourSite.invoicing.co' or fully branded with custom domain
Remove 'Created by Invoice Ninja' or 'Powered by Invoice Ninja' branding from invoices and portal
Platform(4 features)
Desktop applications for macOS, Windows, and Linux for native desktop invoicing experience
Native mobile applications for iOS (App Store) and Android (Google Play) for on-the-go invoicing
Full-featured web application accessible from any browser
WordPress plugin for integrated invoicing within WordPress sites
Support(4 features)
Assistance with migrating data from other invoicing platforms (Premium Business plan)
Direct developer support for customization and technical assistance (Premium Business plan)
Professional invoice design service to create custom branded templates (Premium Business plan)
Direct priority support for Enterprise and Premium Business plans
Cost Calculator
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Build It Yourself
Total Cost Comparison
DIY hosting estimate based on Vercel + Supabase free/pro tiers (~$20/mo). Build time estimated from 71 features at easy complexity.