Kill Bill

Kill Bill is an open‑source platform for managing subscription billing and payments. It provides real‑time analytics, financial reporting, and a modular architecture that lets operators enable, disable, or replace components as needed. The system can be deployed on‑premises or in the cloud, giving full control over data and avoiding vendor lock‑in.

The software targets engineering and finance teams that require a scalable, auditable billing stack for SaaS, e‑commerce, and other recurring‑revenue models. It supports a range of pricing schemes—including usage‑based, prepaid, postpaid, and multi‑tenant white‑label setups—while offering extensibility through plugins and integration points for existing tools. Because it is self‑hosted and licensed under Apache‑2.0, organizations can avoid per‑transaction fees and proprietary pricing structures.

Kill Bill has been used by companies ranging from growth‑stage startups to Fortune 500 enterprises, handling billions in revenue across B2B, B2C, and B2B2C contexts. Its design emphasizes reliability, compliance, and the ability to customize billing logic without waiting on external vendor roadmaps.