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Billing and Invoicing Software

Invoice Ninja

Open-source invoicing, expense and time-tracking software for freelancers and small businesses

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  • Android
  • Online Payments
  • Billing Portal
  • Contingency Billing
  • +12 more
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About Invoice Ninja

Invoice Ninja is an open-source invoicing application for freelancers and small businesses. It brings invoicing, payments, expenses, time tracking and projects into one view, and it has been built since 2014.

What Invoice Ninja offers

  • Invoices and quotes — branded templates, with quotes approved by e-signature and converted to invoices.
  • Online payments — clients pay from the invoice through gateways such as Stripe, PayPal, Square and GoCardless.
  • Recurring billing — automatic billing cycles and late-payment reminder emails.
  • Time tracking and projects — billable tasks, Kanban boards and one-click conversion to invoices.
  • Expenses and vendors — imports bank and card transactions and tracks vendors and purchase orders.
  • Client portal — a page where clients view invoices and pay.

Key facts

  • Founded: 2014
  • Integrations: Gmail, QuickBooks, Slack and Mailchimp, plus Zapier and Make
  • Security: multi-factor authentication and PCI-DSS compliance

Profile written by TrustList from the business's own published information, Oct 2026.

Categories & features

  • Android
  • Online Payments
  • Billing Portal
  • Contingency Billing
  • Customizable Invoices
  • Hourly Billing
  • Mobile Payments
  • Multi-Currency
  • Online Invoicing
  • Payment Processing
  • Project Billing
  • Recurring/Subscription Billing
  • Web-Based, Cloud, SaaS
  • iPhone / iPad
  • Documentation
  • Online

What the business tells TrustList

Founded
2014 (12 years) evidence sent

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