# killbill/killbill

Open-Source Subscription Billing & Payments Platform

Repository: https://github.com/killbill/killbill
Canonical: https://ross.abutalabs.com/products/killbill
Homepage: https://killbill.io
Language: Java
License: Apache-2.0
License Family: permissive
Topics: killbill, billing, payments, subscriptions
Last push: 2026-08-22T04:10:04+00:00

## Health v2 (maintenance only)
Score: 94/100 (v2, computed 2026-09-03T02:20:16.233290+00:00)
- activity 99, release rhythm 85, longevity 100
- inputs: {"age_days": 5064, "days_push": 11, "days_rel": 21, "gap_med": 55, "n_releases_24m": 10}
- flags: none
- formula: round(0.45*activity + 0.35*rhythm + 0.20*longevity); archived -> min(score, 10)

## Adoption (not part of the score)
Stars 5704, forks 956 (observed 2026-08-28T04:09:28.106689+00:00)

## What it is
Kill Bill is an open-source subscription billing and payments platform that manages subscriptions, invoicing, payment processing, and dunning through a REST API and extensible plugin architecture. It is self-hosted (or cloud-deployed) Java software designed to replace SaaS billing vendors without vendor lock-in.

## Use cases
- run recurring subscription billing for a SaaS product
- generate invoices and process payments through gateways like Stripe
- handle trials, coupons, proration, and plan upgrades/downgrades
- self-host billing infrastructure to avoid vendor lock-in and revenue-share fees
- integrate billing with ERP/CRM systems like NetSuite or Salesforce
- implement usage-based and one-time billing models
- manage dunning and payment retries for failed charges

## When to avoid
- you want a turnkey hosted SaaS billing solution with zero operations
- you only need simple one-off invoicing without subscriptions
- your team cannot operate JVM-based infrastructure and databases

## Facets
- artifact type: application
- maturity: stable
- function: api-framework, plugin-system, workflow-automation, analytics
- domain: fintech, e-commerce, backend, self-hosted, apis
- platform: jvm, self-hosted, cloud
- tags: subscription-billing, payments, invoicing, payment-gateway-plugins, rest-api, multi-tenant, dunning, proration, saas-billing, docker, web-server

## Member repositories
- killbill/killbill (main) score 94

## Provenance
- Observed fields: from GitHub, fetched 2026-08-28T04:09:28.106689+00:00.
- Health v2: computed from the inputs above; adoption is never an input.
- Inferred fields (summary, facets, guidance): AI-extracted, prompt v1, taxonomy v1, on 2026-08-29T17:53:33.384136+00:00, confidence not recorded.
  - readme: https://github.com/killbill/killbill (fetched 2026-08-28T04:09:28.106689+00:00, sha ff1b9329b6cf)
  - homepage: https://killbill.io (fetched 2026-08-29T08:49:11.950496+00:00, sha 36502a617697)
  - site_page: https://docs.killbill.io/ (fetched 2026-08-29T08:49:11.958798+00:00, sha 53c2a536a86f)
  - site_page: https://blog.killbill.io/blog/everything-you-ever-wanted-to-know-about-kill-bill-part-1 (fetched 2026-08-29T08:49:11.963809+00:00, sha 10d3cac88c28)
  - site_page: https://blog.killbill.io/blog/everything-you-wanted-to-know-about-kill-bill-part-2 (fetched 2026-08-29T08:49:11.965421+00:00, sha 21b6e28b157e)
  - site_page: https://killbill.io/platform/plugin-integrations.html (fetched 2026-08-29T08:49:11.955129+00:00, sha 9907b64c4793)
  - site_page: https://killbill.io/use-cases/saas-subscriptions.html (fetched 2026-08-29T08:49:11.956990+00:00, sha b31181589288)
  - site_page: https://killbill.io/platform/catalog-pricing.html (fetched 2026-08-29T08:49:11.953262+00:00, sha 557bda2eeaec)
  - site_page: https://killbill.io/pricing.html (fetched 2026-08-29T08:49:11.960470+00:00, sha 3c5078c74313)
  - site_page: https://killbill.io/aviate.html (fetched 2026-08-29T08:49:11.962183+00:00, sha d29eb36263d5)
- Data as of 2026-08-30T08:39:29.467469+00:00.