Best Tools Invoicing & Billing

Best Indie Invoicing & Billing Tools in 2026

Discover the best indie invoicing & billing tools built by independent developers. Focused functionality, fair pricing, and real human support.

8 tools · Updated daily · Browse full category →

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Klirr Verified

Zero-maintenance invoicing that generates beautiful invoices automatically

Invoicing & Billing
open-sourcerustinvoicing
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Free invoicing, expenses, and time-tracking for freelancers

Invoicing & Billing
open-sourcefreelancersself-hosted
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See your freelance income and workload before it happens

Invoicing & Billing
freelancersforecastingsolo-founder

Manage Factur-X and ZUGFeRD 2.0 PDF invoices in PHP

Invoicing & Billing
open-sourcephpinvoicing

Swiss QR Bill generation for Node.js and browsers

Invoicing & Billing
open-sourceinvoicingswiss

Library for creating European-compliant electronic invoices

Invoicing & Billing
open-sourcephpinvoicing

Simple invoicing REST API — send JSON, get a PDF

Invoicing & Billing
open-sourceapiinvoicing

Super simple PDF invoicing library for Ruby

Invoicing & Billing
open-sourcerubypdf