Open alternatives3
Open-source apps that replace FreshBooks, QuickBooks and more
Crater is a free web and mobile app for making invoices and estimates, and tracking expenses and payments. It is for individuals and small businesses that need to bill customers.
SolidInvoice is a free program for creating quotes, invoices and online payment requests, aimed at freelancers and small businesses. You can run it on your own server or pay a flat monthly fee to have it hosted for you.
Lago is a billing system for software products that tracks how customers use a product and turns that usage into prices, invoices and payments. It is aimed at companies that sell usage-based or AI services and the developers who build billing for them.
What's missing
What people still miss here, and wish existed. Upvote what matters to you.
Before you build
Planning something for invoicing & billing? See what exists first, so you can reuse parts or explain what's different. Paste this into any AI assistant:
Fix the list itself
A project or closed app missing from this list, or a mistake on it? These open a short form on GitHub, and a mod reviews it. To say what a project can't do, use What's missing.
About this page
Replaces fully means it does the main job of these apps; Replaces partly means it covers some of it.
Licenses: every project here uses an open-source license (what each one means). Open core means some parts are paid or under another license.
GitHub stars are shown for reference. They measure popularity, not whether it replaces anything.
Verified means r/TrueOpenSource mods checked it: open-source license, maintained, and it really does the job.
How Open Source Everything works