Two options. Never a revenue share.
Run Kill Bill open source for free, or choose Aviate for enterprise features and support from the engineers who build the platform. Pricing is never tied to your revenue.
Last updated: October 2026
Trusted by companies processing billions in revenue
Short answer
How much does Kill Bill cost?
Kill Bill is free and open source under the Apache 2.0 license. You host and run it yourself, without support or SLA. Aviate, the enterprise offering of Kill Bill, costs 9,999 USD per month, billed annually. It adds metering, prepaid credits, coupons, tax rates, custom invoice sequencing, a catalog UI, health monitoring and Level 3 support from the engineers. Neither option charges a percentage of revenue or a fee per transaction.
Two options
Kill Bill open source
Free
Apache 2.0, self-hosted
You deploy, operate and upgrade the platform
Community help, no support, no SLA
Aviate
9,999 USD per month
Billed annually
The enterprise version of Kill Bill, with added features, for companies with complex billing needs
Level 3 support through a dedicated Slack channel, directly with the engineers
Response within 1 business day for P1 issues
Runs in any cloud or on your own infrastructure
Kill Bill Open Source and Aviate, Side by Side
 Kill Bill open source |  Aviate | |
|---|---|---|
| Price | Free | 9,999 USD per month, billed annually |
| License | Apache 2.0 | Commercial license, on top of Kill Bill |
| Hosting | You run it, in your cloud or data center | Any cloud or your own infrastructure |
| Support | Community help, no support, no SLA | Level 3 support from the engineers, on a dedicated Slack channel. First response within 1 business day for a P1 |
| Subscriptions, invoices, payments | Included | Included |
| Payment and tax plugins | Included | Included |
| Usage billing | Usage API, per subscription | Adds Aviate Metering for raw usage events |
| Prepaid credits | Account credit | Adds Aviate Wallet: paid and free credits, top-off, expiration |
| Promotions | Discount phases in the catalog | Adds Aviate Coupons |
| Tax | Tax plugins such as AvaTax, Vertex or Kintsugi | Adds Aviate Tax: rates per country and per product |
| Invoice numbers | One sequence for the deployment | A sequence per account or per tenant |
| Catalog | XML catalog and API | Adds a catalog UI |
| Operations | Kaui admin UI | Adds the Aviate interface and Aviate Health |
| Revenue share or fee per transaction | None | None |
Flat annual fees, never tied to your revenue
No percentage of revenue, no per-transaction charges, no surprises as you scale.
FAQs
Pricing FAQ
How much does Kill Bill cost?
Kill Bill open source is free, under the Apache 2.0 license. Aviate, the enterprise offering of Kill Bill, costs 9,999 USD per month, billed annually.
Is Kill Bill really free?
Yes. You can download, use and change Kill Bill under the Apache 2.0 license, with no license fee and no fee per transaction. You host and run it yourself, and the open source version comes without support or SLA.
What does Aviate add to Kill Bill?
Aviate adds Aviate Metering for raw usage events, Aviate Wallet for prepaid credits, Aviate Coupons, Aviate Tax, custom invoice sequencing, a catalog UI, Aviate Health for operations, and Level 3 support from the engineers who build the platform.
Is the price tied to my revenue or transaction volume?
No. Aviate is a flat annual fee. There is no percentage of revenue and no charge per transaction, so the price does not grow with your billing volume.
What support comes with Aviate?
Level 3 support from the engineers who build and maintain the platform, on a dedicated Slack channel, with a first response within 1 business day for a P1 issue.
Where does Aviate run?
In any cloud or on your own infrastructure. Your billing data stays in your own database.
Can I start with Kill Bill open source and add Aviate later?
Yes. Aviate runs on top of Kill Bill: the Aviate plugin is installed on your Kill Bill deployment, and Aviate adds its own web interface.
Do I pay payment gateway fees to Kill Bill?
No. Kill Bill connects to your payment gateway through plugins. Gateway fees are agreed between you and your payment provider.
Not sure where to start?
Talk to the Kill Bill team. We can help you choose between Kill Bill open source and Aviate.
Support
Support is included in Aviate
Documentation
Organized product documentation library and API Reference
Community
Join the discussion in our user community
Admin UI
Kaui, the open source admin UI of Kill Bill