✓ Trusted by F500 companies processing billions in revenue

Open-source billing infrastructure. Enterprise revenue software built on it.

Run Kill Bill in your own infrastructure, or use Aviate for product, pricing, commercial workflows, usage, billing and revenue operations.

Try Sandbox

Talk to Us

15+ years in production Billions processed 100K+ subscriptions

Who This Is For

Trusted by growth-stage startups and Fortune 500 companies

Kill Bill is proven at scale, handling billions in recurring revenue across B2B, B2C, and hybrid business models. Deploy in your infrastructure with predictable, fixed pricing.

Engineering Leaders

Full control. Deploy in your infra. Extend without waiting on vendor roadmaps.

Try Sandbox

Finance & Ops Teams

Accurate invoicing, audit logs and billing data in your own database.

Talk to Us

Growth-Stage Companies

No % fees. Predictable costs as you scale.

See Pricing

Two ways to start

Kill Bill is the open-source billing engine, for builders and teams that support themselves. Aviate is its enterprise edition: the same engine, with the commercial, metering, revenue and operations layer companies run in production.

Kill Bill Open Source

Free

Self-hosted. Deploy on your infra via Docker or AWS. Full access to source code and plugins. Community help, no support or SLA.

Start Open Source

Aviate, the Enterprise Edition

Commercial software

Includes the full Kill Bill engine, extended into one revenue platform: product and pricing, quotes, usage metering, billing and revenue operations, with the Aviate interface and Premium support. Its runtime and production billing data stay in your infrastructure.

Try Sandbox

Enterprise Revenue Platform

Manage the commercial lifecycle on Kill Bill

Aviate is the enterprise edition of Kill Bill: the same engine, extended into a commercial revenue platform. It brings product and pricing management, quotes and contracts, usage metering, billing, and revenue operations together while your team controls the production infrastructure and data.

Run Kill Bill and the Aviate runtime in infrastructure your team controls

Fixed pricing, never a percentage of your revenue

Includes the Kill Bill engine; Kill Bill stays free under Apache 2.0 and Aviate is separately licensed

Learn about Aviate

Why teams choose Aviate

Commercial lifecycle

Billing foundation → Same engine, plus catalog, contracts, usage and revenue operations

Deployment and data

Customer operated → Production stays in your infrastructure

Pricing model

% of revenue → Fixed cost

Product

Battle-tested at scale. Extensible by design. Yours to control.

Whether you're billing for SaaS subscriptions, usage-based AI tokens, multi-tenant white-label platforms with thousands of tenants, or complex prepaid/postpaid models, Kill Bill provides battle-tested primitives proven at global scale.

Kill Bill can fulfill the billing and payment needs of nearly any online business:

Scale your billing infrastructure without scaling vendor bills: predictable costs as you grow

Access real-time analytics and financial reports

Own your data and destiny: in-house deployment with full auditability and zero vendor lock-in

Subscription Billing

Experience unrivalled versatility with Kill Bill Subscription Billing, giving you complete control over subscriptions and pricing models, including usage-based billing, to support your unique business needs.

View Subscription Billing

Payment Platform

Take control of your payments strategy with Kill Bill, easily integrating with payment gateways, issuing banks, and fraud tools via its robust partner ecosystem and extensible plugin interface.

View Payment Platform

Admin User Interface

Kaui is a robust, user-friendly back-office web-based UI for customer success, finance, RevOps, and developer teams to easily configure price books and manage subscriptions & payments.

View Kaui

Ecosystem

Connect to the tools your business already uses

Kill Bill's plugin architecture integrates with leading payment gateways, tax engines, and cloud infrastructure, or you can build your own with the open plugin framework.