klirr
A zero-maintenance smart FOSS tool that generates beautiful invoices for services and expenses.
What is klirr?
Klirr is a free and open-source command-line tool that automatically generates beautiful, professional invoices for services and expenses. It solves the problem of manual invoice creation by providing a smart, zero-maintenance solution that handles formatting, calculations, and presentation automatically.
Freelancers, independent contractors, and small business owners who need to create professional invoices regularly without spending time on manual formatting or complex software.
Developers choose Klirr because it's completely free, open-source, requires zero maintenance, and produces beautiful invoices automatically—eliminating the need for manual work or expensive proprietary invoicing software.
Overview
Zero-maintenance and smart FOSS generating beautiful invoices for services and expenses.
Use Cases
Best For
- Freelancers needing automated invoice generation
- Small businesses creating service invoices
- Contractors tracking billable hours and expenses
- Developers who prefer command-line tools for productivity
- Open-source advocates seeking FOSS business tools
- Anyone wanting beautiful invoices without manual formatting
Not Ideal For
- Businesses requiring advanced billing features like multi-currency support or tax automation
- Teams needing real-time collaboration on invoice editing and approval workflows
- Users who prefer graphical interfaces and are uncomfortable with command-line tools
Pros & Cons
Pros
Automatically handles updates and dependencies, so users never need to manually install patches or manage software upkeep.
Generates visually appealing invoices with smart structuring, eliminating manual formatting efforts for a polished look.
Completely free to use with transparent development, avoiding costs and allowing community customization or contributions.
Supports both service-based billing and expense reimbursement, covering key invoicing needs for freelancers in one tool.
Cons
Relies entirely on command-line usage, which can be a significant barrier for non-technical users or those accustomed to GUI applications.
Focuses on core invoice generation; lacks built-in features like client management, payment processing, or recurring invoice automation.
Requires initial command-line setup and familiarity with its syntax, which might be more complex than drag-and-drop invoicing software.
Frequently Asked Questions
Related Projects
Manta🎉 Flexible invoicing desktop app with beautiful & customizable templates.
InvoicePlaneA self-hosted open source application for managing your invoices, clients and payments.
Ruby Invoicing FrameworkRuby invoicing framework gem
InvoiceGeneratorLibrary to generate PDF invoices.
Found a gem we're missing?
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