SolidInvoice
Open-source invoicing software for freelancers and small businesses
About SolidInvoice
SolidInvoice is an open-source invoicing platform available as both a free self-hosted solution and a managed cloud service. It handles unlimited invoices, quotes, recurring billing, online payments via Stripe and PayPal, client management, and multi-currency support with a simple flat-rate pricing model.
Pros & Cons
Pros
- Very affordable flat-rate pricing with no per-user fees
- Fully open-source with free self-hosted option
- Simple and clean UI focused on core invoicing
- Multi-currency support for international billing
- No credit card required for 30-day trial
- REST API for custom integrations
Cons
- Single plan with no advanced tiers for larger teams
- Smaller ecosystem and fewer integrations than FreshBooks or Zoho
- Limited brand recognition compared to established competitors
- Primarily targeted at freelancers and small businesses, not enterprise
Key Features
Unlimited Invoices & Quotes
Create and send unlimited invoices and quotes with professional templates
Recurring Billing
Set up automated recurring invoices with custom schedules
Online Payments
Accept payments via Stripe, PayPal, or offline methods like bank transfer and cash
Automatic Payment Reminders
Automated follow-ups for overdue invoices
Client Management
Manage contacts, notes, and activity history for each client
Multi-Currency Support
Invoice clients in their local currency for international billing
Team Collaboration
Role-based permissions for team members
Financial Reporting
Track revenue, outstanding payments, and financial performance
REST API
Integrate with other tools and automate workflows via API
Self-Hosted Option
Deploy on your own infrastructure for full data control with the open-source version
Pricing
- Open-source
- Full feature set
- Host on your own infrastructure
- Community support
- All features included
- Automatic backups
- Managed hosting
- 30-day free trial
- All features included
- Automatic backups
- Managed hosting
- Save 2 months
Best For
Freelancer Billing
Send professional invoices and accept online payments from clients without complexity
Small Business Recurring Revenue
Automate subscription and retainer billing with recurring invoice schedules
International Invoicing
Bill clients across countries in their local currency with multi-currency support
Self-Hosted Financial Control
Deploy on your own servers for complete data ownership and privacy compliance
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Featured In
7 Best Open-Source Invoicing & Finance Tools for Freelancers (2026)
Best for simplicity — the easiest open-source invoicing tool to set up and use, ideal for freelancers who want clean invoices with online payments and nothing more.
6 Best Accounting Tools for Fast Bank Reconciliation (2026)
Best for service businesses with payment gateway collection — SolidInvoice's automatic payment recording pre-reconciles most transactions through invoicing rather than bank matching.