Chargebee
Subscription billing and revenue management for recurring businesses
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Discover top open-source software, updated regularly with real-world adoption signals.
Open-source subscription billing and payments platform for SaaS
Self-hosted subscription billing and payment infrastructure with real-time analytics, flexible pricing models, and modular architecture. Scale without vendor lock-in.
Kill Bill is a battle-tested subscription billing and payments platform built for SaaS and e-commerce businesses that need control over their financial infrastructure. For over a decade, it has powered billing operations for organizations of all sizes, from startups testing pricing models to large enterprises processing millions of transactions.
Unlike monolithic SaaS solutions, Kill Bill offers a highly modular design that lets you enable only the functionality you need. Test multiple subscription models, run promotional trials, manage complex discount schedules, and access real-time analytics—all while maintaining full ownership of your business and customer data. The platform integrates seamlessly with existing systems or operates as a complete billing solution.
Whether on-premises or in the cloud, Kill Bill scales with your business. Start in one area and expand incrementally as needs evolve. The Apache 2.0 licensed platform provides SaaS-like subscription management capabilities with the flexibility and transparency of open source, supported by comprehensive documentation and one-click AWS deployment options.
When teams consider Kill Bill, these hosted platforms usually appear on the same shortlist.
Looking for a hosted option? These are the services engineering teams benchmark against before choosing open source.
Multi-Tier SaaS Subscription Testing
Rapidly test and iterate on pricing models, trial periods, and promotional discounts to identify the most profitable subscription structure without vendor constraints.
Enterprise Billing Migration
Incrementally migrate billing operations from legacy systems or third-party providers while maintaining full control over customer data and financial reporting.
E-Commerce Payment Infrastructure
Build scalable payment processing for online stores with complex discount schedules, seasonal promotions, and real-time revenue analytics.
Regulated Industry Compliance
Deploy on-premises billing infrastructure to meet data sovereignty, privacy regulations, and audit requirements while avoiding third-party data sharing.
Kill Bill is licensed under Apache License 2.0, allowing free commercial use, modification, and distribution.
Yes, Kill Bill supports both on-premises and cloud deployments. AWS one-click deployment is available, and free hosted sandboxes are offered at cloud.killbill.io.
Kill Bill is primarily built in Java, with components written in JavaScript, Ruby, and other languages across its modular architecture.
Not necessarily. Kill Bill's modular design lets you use only the components you need and integrate with existing systems rather than forcing an all-in-one replacement.
Yes, Kill Bill has been proven in production with large SaaS and e-commerce organizations over the past 10 years, demonstrating reliability at scale.
Project at a glance
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