Open Source Billing Software Built for AI Teams

Enterprise-grade open source billing software that scales with you. Complete control, zero vendor lock-in, and flexible deployment options for AI teams.

Trusted by 100+ AI and Agentic Teams

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Open source billing engine built for AI-native companies

Built to handle the complexity of AI pricing without building billing infrastructure from scratch.

Subscription Management

Handle complex subscription models, including tiered pricing, usage-based billing, metered charging, and hybrid plans with ease.

Automated Invoicing

Show customers exactly what they used; API calls, tokens, model runs, everything. Generate clear invoices that break down costs by feature, support any currency, and match your brand.

Payment Processing

Integrate with popular payment gateways. Handle credit top-ups, usage charges & subscriptions all in one place. Secure, compliant and supports payment methods your customers actually use.

Entitlements & Access Control

Manage what features or models customers can access based on their plan or usage. Sync entitlements with your product to automate provisioning and upgrades across tiers.

Best open-source billing system for growing companies

Startup Stage

Launch quickly with pre-built billing flows, focus on product development whilst automated billing handles subscriptions, trials, and basic invoicing seamlessly.

Growth Phase

Scale confidently with advanced pricing models, multi-currency support, and API integrations. Handle thousands of transactions whilst maintaining billing accuracy and compliance.

Enterprise Ready

Deploy across regions, support complex hierarchies, implement custom workflows, and manage millions of billing events with robust infrastructure and dedicated support options.

Technical Excellence

Flexible Data Models

Customise billing entities, pricing rules, and customer hierarchies to match your exact business logic without constraints.

Extensible Plugins

Add custom functionality through our plugin system. Integrate tax engines, fraud detection or proprietary business rules effortlessly.

Multi-Tenancy Support

Serve multiple brands or subsidiaries from a single instance whilst maintaining complete data isolation and security.

Join Our Community

Connect with developers, contribute to the project, and help shape the future of open source billing software. Whether you're reporting bugs, requesting features, or contributing code, your involvement makes a difference.