Open-Source Billing Engine for Modern SaaS
Stop building billing from scratch. KwikBill handles usage tracking, subscription management, proration, and invoicing—so you can focus on your product.
Why Build Another Billing System?
Every SaaS company faces the same billing challenges: tracking usage, calculating prorated charges, handling plan changes, managing subscriptions, and generating accurate invoices. These aren’t differentiators—they’re table stakes.
KwikBill is an open-source billing engine that handles all the complex billing logic, so you can integrate payments in days, not months.
How Money Flows Through KwikBill
KwikBill sits between your application and payment providers, handling all the complex billing logic:
- Usage Tracking – Track API calls, storage, compute time, seats, or any metric
- Customer Management – Store customer data, payment info, and subscription history
- Pricing Rules – Define plans, tiers, discounts, and proration logic
- Invoice Generation – Automatically calculate charges and generate invoices
- Payment Processing – Integrate with Stripe, PayPal, or bank transfers
- Reconciliation – Match payments to invoices and handle failed payments
Instead of building these components from scratch, install KwikBill, configure your pricing rules, and start billing customers in hours.
Currently in Development
KwikBill is being actively developed with a planned launch in Q2 2025. The project will be fully open-source and available on GitHub.
Want early access? Sign up below to be notified when we launch the beta and get priority onboarding.