Billing

Kill Bill5.4k★

If you need subscription billing — recurring charges, invoicing, payment processing, plan management, usage-based billing — and you don't want to hand 2-3% of every transaction to Stripe Billing or Chargebee, Kill Bill lets you own the entire billing stack. Kill Bill is a full billing and payments platform: subscription management, invoicing, payment processing (pluggable gateways: Stripe, Braintree, Adyen, etc.), tax calculation, revenue recognition, and multi-tenancy. It's been around since 2010 and handles real money in production. 5.4k stars. Apache 2.0 license. Used by companies processing billions in payments. Self-host for free. The company behind it (Kill Bill Inc.) offers paid support and consulting, but the software is fully open. Small teams with significant billing complexity — usage-based pricing, multi-currency, custom invoicing — should evaluate Kill Bill. If you're just charging $20/mo for a SaaS, Stripe Billing is simpler. The catch: this is enterprise-grade Java software that's complex to deploy and maintain. It runs on a JVM, needs a database, and the documentation assumes billing domain expertise. The learning curve is steep. For simple subscriptions, this is a bulldozer for a garden.