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Kill Bill

Open-source billing and payment platform for managing subscriptions, automating billing processes, and integrating payment gateways.

Introduction

Kill Bill is an open-source subscription billing and payment platform designed for managing complex billing scenarios. It offers a robust set of features including:

  • Subscription Management: Handles recurring billing with flexible pricing models, including usage-based billing.
  • Payment Gateway Integration: Integrates with various payment gateways, issuing banks, and fraud detection tools through plugins.
  • Kaui Admin UI: Provides a user-friendly web interface for managing subscriptions, payments, and price books.
  • Customizable Plugins: Allows developers to extend the platform's functionality through custom plugins.
  • Data Ownership: Ensures complete ownership of billing data, avoiding vendor lock-in.

Kill Bill is suitable for businesses of all sizes, from startups to large enterprises, requiring a flexible and scalable billing solution. It supports various use cases, including subscription management, payment processing, and financial reporting.

Latest News

Kill Bill Changelog

Kill Bill Changelog

8/4/2026

Kill Bill Changelog ## July 1st, 2026 Kaui version 4.0.21 was released. It includes some bug fixes and improvements, including: #615- Unnecessary "No bundles found" message on subscription screen #620- Edit Column Bug Fix Ability to download logs table on Kaui logs screen: Added a "Download JS...

Real-Time Usage Rating with Aviate — Any Event, Any Price, Any Business Model - Kill Bill

Real-Time Usage Rating with Aviate — Any Event, Any Price, Any Business Model - Kill Bill

8/4/2026

Real-Time Usage Rating with Aviate — Any Event, Any Price, Any Business Model - Kill Bill # Real-Time Usage Rating with Aviate — Any Event, Any Price, Any Business Model by | Jun 3, 2026 | Billing Systems, Metering, Usage-based billing # The Problem We’re Solving The world is full of businesses...

Keeping Your Billing Platform Healthy: Introducing Aviate Health Monitoring - Kill Bill

Keeping Your Billing Platform Healthy: Introducing Aviate Health Monitoring - Kill Bill

8/4/2026

Keeping Your Billing Platform Healthy: Introducing Aviate Health Monitoring - Kill Bill Back to Blog # Keeping Your Billing Platform Healthy: Introducing Aviate Health Monitoring by | May 22, 2026 | Billing Systems # The Challenge of Monitoring a Billing Platform Monitoring a billing platform ...

Announcing Kaui 4: Faster, Smarter, and Built for Enterprise-Scale Billing - Kill Bill

Announcing Kaui 4: Faster, Smarter, and Built for Enterprise-Scale Billing - Kill Bill

8/4/2026

Announcing Kaui 4: Faster, Smarter, and Built for Enterprise-Scale Billing - Kill Bill # Announcing Kaui 4: Faster, Smarter, and Built for Enterprise-Scale Billing by | Nov 17, 2025 | Kaui Kaui 4 is here. As one of the Kill Bill cofounders, this release feels personal. Kaui has been part of Kil...

Two Days in Miami with ChaChing: Making Enterprise Billing Accessible - Kill Bill

Two Days in Miami with ChaChing: Making Enterprise Billing Accessible - Kill Bill

8/4/2026

Two Days in Miami with ChaChing: Making Enterprise Billing Accessible - Kill Bill # Two Days in Miami with ChaChing: Making Enterprise Billing Accessible by | Mar 13, 2026 | Billing Systems Over the past few years, we’ve had the chance to work closely with the team at ChaChing. It’s one of those...

Alternatives

  • Stripe Billing

    Stripe Billing offers a powerful API-first platform for managing subscriptions, recurring payments, and invoicing, similar to Kill Bill's core functionalities.

  • Chargebee

    Chargebee provides a comprehensive subscription billing and revenue management platform with extensive automation and integration capabilities for recurring businesses.

  • Recurly

    Recurly specializes in automating subscription billing, managing customer lifecycles, and optimizing recurring revenue for various business models.

  • Zuora

    Zuora is an enterprise-grade subscription management platform that handles billing, payments, and revenue recognition for large-scale recurring businesses.

  • Paddle

    Paddle acts as a merchant of record, combining subscription billing, payment processing, and tax compliance into a single platform for software companies.

  • Chargify

    Chargify focuses on flexible recurring billing and subscription management specifically designed for SaaS and subscription-based businesses.

  • GoCardless

    GoCardless specializes in recurring bank payments like Direct Debit and ACH, offering a robust solution for subscription models that prefer bank-to-bank transactions.

  • Odoo Subscriptions

    Odoo offers an open-source ERP with a dedicated subscription management module, providing a flexible and customizable solution akin to Kill Bill's open-source nature.

  • FastSpring

    FastSpring provides a full-service platform for global subscription billing, payment processing, and tax compliance, acting as a merchant of record.

  • Maxio

    Maxio (formerly SaaSOptics) offers comprehensive subscription billing, revenue recognition, and financial operations for growing SaaS companies.

FAQ

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