Invoice Ninja
Free open-source invoicing, expenses, and time-tracking for freelancers and small businesses
Founded
2014
Starting Price
$0
Category
Finance & Accounting
Last updated April 27, 2026
About Invoice Ninja
Invoice Ninja is a powerful open-source invoicing platform that helps freelancers and small businesses create professional invoices, accept online payments, track expenses, and manage projects. Available as both a hosted SaaS and a self-hosted solution, it offers over 100 payment gateway integrations, multi-currency support, and customizable invoice templates — all with a generous free tier.
Pros & Cons
Pros
- Open-source with a self-hosted option gives full control over data and privacy
- Generous free tier with unlimited invoices for up to 5 clients
- Supports 100+ payment gateways including Stripe, PayPal, and Square
- Multi-currency support for 100+ currencies with automatic exchange rates
- Highly affordable compared to competitors like FreshBooks or QuickBooks
Key Features
Professional Invoicing
Create and send customizable invoices with multiple templates, auto-billing, recurring invoices, and partial payment support.
Online Payments
Accept payments via 100+ gateways including Stripe, PayPal, Square, and ACH with automatic payment reconciliation.
Expense Tracking
Track and categorize business expenses, attach receipts, and re-invoice expenses to clients with one click.
Time Tracking & Projects
Log billable hours with built-in timers, organize work into projects, and convert tracked time directly into invoices.
Quotes & Proposals
Create professional quotes that clients can approve online, which automatically convert into invoices upon acceptance.
Client Portal
Branded self-service portal where clients can view invoices, make payments, approve quotes, and download documents.
Multi-Currency Support
Invoice in 100+ currencies with automatic exchange rate updates, ideal for businesses with international clients.
Pricing
Free
$0/month
- Up to 5 clients
- Unlimited invoices
- 4 invoice templates
- Online payments
- Expense tracking
Best For
Freelancer Invoicing
Solo freelancers can create professional invoices, track time spent on projects, and accept online payments without paying for expensive accounting software.
Small Business Billing
Small businesses can manage recurring invoices, track expenses, handle purchase orders, and give clients a branded self-service payment portal.
Agency Time & Project Billing
Agencies can track billable hours across multiple projects, assign work to team members, and convert logged time into detailed client invoices.
Self-Hosted Financial Management
Privacy-conscious businesses can deploy Invoice Ninja on their own servers to maintain full ownership of sensitive client and financial data.
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