Which fits your billing team: Stripe Billing or Kill Bill
Stripe Billing fits teams that are happy with Stripe as both payment processor and billing product, while Kill Bill fits teams that need billing logic inside their own infrastructure and have Java operations skills. The choice is less about features than about who owns the subscription rules, the invoice run and the data that flows through them. Stripe Billing charges a share of billing volume on top of processing fees, so the cost question grows with revenue. Kill Bill is free under the Apache License 2.0, but the work of running it moves onto your team.
The decision turns on four things. First, billing volume and how fast it grows, because a percentage-based fee scales with revenue while self-hosting costs scale with infrastructure and staff time. Second, data control requirements, meaning whether your regulators or internal policy require subscription, invoice and customer records to stay in systems you run. Third, multi-gateway needs: Kill Bill connects to Stripe, Braintree and PayPal through plugins, which helps if you expect to move or split processors. Fourth, in-house engineering capacity. Kill Bill is a standalone Java server typically run in Tomcat, with the Kill Bill core team testing against MySQL, MariaDB 10 and PostgreSQL 12, and the Tomcat installation guide requires JDK 11. Confirm with your platform team that they can operate that stack, patch it, and own the plugin deployments before you commit.
Before deciding, ask your team to name who will answer for a failed invoice run at 2 a.m., and whether that person already maintains Java services. Kill Bill ships without support or an SLA, so any response commitment must come from your own staff or from a partner you contract separately. If the answer is unclear, Stripe Billing may remain the lower-risk choice even at higher volume. Review the Kill Bill documentation on what it is alongside your own requirements list before the evaluation.
Which option fits which scenario
This table matches common Stripe Billing situations to the option that suits them better, with the reason for each choice. Read it against your own catalog size, gateway count, data residency rules and in-house Java skills, then check the support gap for Kill Bill before deciding.
| Scenario | Better fit | Reason |
|---|---|---|
| Card-only business with a small plan catalog on Stripe | Stripe Billing | Stripe already holds the customers, cards and invoices, and a small catalog avoids the work of modeling plans in a self-hosted engine. |
| Team that needs billing records in its own database | Kill Bill | Kill Bill runs in your environment with its own database (MySQL, MariaDB or PostgreSQL), so subscriptions, invoices and credits sit where your data team can query them. |
| Multi-gateway business routing payments across several processors | Kill Bill | Kill Bill uses payment plugins for gateways such as Stripe, Braintree and PayPal, so you can keep more than one processor under one billing ledger. |
| Regulated team that must control where billing records live | Kill Bill | Self-hosting lets you choose the region, network and access controls for billing data, though you must confirm how your assessor will treat plugin and gateway data flows. |
| Team with no Java operations experience | Stripe Billing | Kill Bill runs as a Java WAR in Tomcat with JDK 11 and plugin JARs, so without Java skills the operating load and hiring need often outweigh the benefit. |
| Team that needs guaranteed vendor support and an SLA | Stripe Billing | Kill Bill is Apache 2.0 licensed with no support or SLA included, so vendor-backed response times must come from a commercial partner or your own staff. |
| Team that wants a back-office UI for finance and support | Kill Bill | Kaui provides role-based access for support, product configuration and finance reporting, though you should test whether it covers your workflows. |
What Kill Bill adds in Java platform work
Kill Bill is a standalone Java server, not a library you embed, so the first platform decision is operational rather than architectural. It is packaged as a WAR file and typically runs in Tomcat, with your billing logic exposed through REST APIs that your product and finance systems call. Payment gateways, tax engines and fraud providers are added as plugins deployed as JARs into the same Tomcat environment. Your team therefore needs people who can run a Java application server, manage JVM upgrades, deploy and version WAR and JAR artifacts, and read application logs. The Tomcat installation guide in the getting started documentation requires JDK 11, so confirm that version against your security baseline and your patching cycle before you commit to the platform. Check the release notes in the killbill/killbill releases page for the Java and Tomcat versions each release supports.
The database choice shapes the operating load more than most teams expect. The Kill Bill core team uses MySQL, and its regression tests run against MariaDB 10 and PostgreSQL 12. The getting started guide also notes that users have deployed Kill Bill with Oracle, Percona and Aurora. Those are reports of use, not a support commitment, so ask whether your chosen database version has been tested by the core team or only by your own staging runs. Your DBA team will own backups, replication, schema migrations during upgrades and performance tuning for the event and invoice tables. If your organization already runs a database engine with strong operational tooling, weigh that against the version the project tests most often.
Plugin ownership is where the engineering commitment becomes permanent. Each gateway connector you need, including the one for your payment processor, is Java code you either build, customize or maintain, and it has to track the Kill Bill plugin interfaces as the core evolves. Decide before go-live who owns each plugin, who reviews changes to it, and who can roll back a failed deployment in production. Note that the project itself offers no support or SLA under its Apache License 2.0 terms, so a commercial support or retainer arrangement is a separate contract to scope in writing. Kill Bill's getting started guide and the Kaui back-office UI for internal roles are useful reference points when you draw up that ownership map.
Where billing data lives and who controls it
Moving billing logic to Kill Bill changes where subscription, invoice and customer records sit and who can reach them. The cards below cover where the data lives, who operates the platform, how access is controlled, where card data stays, what evidence you must produce, and what support you carry yourself.
Data location and residency
With Stripe Billing, subscriptions, invoices and customer records sit in Stripe's hosted service. With a self-hosted Kill Bill, the database and the Tomcat server hold those records in your environment, so you decide the region, backup location and retention. Confirm which data categories your residency rules cover, including invoice PDFs, logs and plugin caches, and check which of them Kill Bill writes to disk or to external services.
Hosting in your cloud or data center
Kill Bill runs as a standalone Java server packaged as a WAR file and is typically deployed in Tomcat, with a relational database behind it. You can host it in your own cloud account, a private data center or a restricted network. The core team tests against MySQL, MariaDB 10 and PostgreSQL 12, and the Tomcat guide requires JDK 11. Ask your platform team to confirm that these versions match your approved stack before you commit to a design.
Identity and access through Kaui roles
Kaui is Kill Bill's back-office interface, and it offers role-based access control for support, product configuration, finance reporting and testing. Map each role to a job, so support agents cannot change product catalogs and finance users cannot alter tenant configuration. Connect the Kaui and API access to your identity provider where possible, and confirm the exact integration path with DeployOpen or the Kill Bill documentation before you design it.
Card data stays with the processor
Kill Bill connects to gateways such as Stripe, so card numbers can remain with Stripe as your payment processor while billing logic moves in-house. Moving card data out of Stripe is a separate step that requires a PCI DSS Level 1 destination and an encrypted export. Keep your PCI scope decision and your billing platform decision separate, and have your assessor confirm which systems store, process or transmit cardholder data.
Audit evidence you must produce
A self-hosted billing system shifts evidence production to you. Expect to show access reviews for Kaui roles, change records for catalogs and plugin deployments, database backup and restore tests, and logs that trace invoice adjustments and credits. Kill Bill does not issue audit reports or attestations. Ask your auditor which evidence formats they accept, and plan for these records from the first day of the project.
Licensing without support or SLA
Kill Bill is licensed under the Apache License 2.0, and the project includes no support or SLA. The Billing Project, LLC owns the codebase and trademarks, and the platform has been in production since 2010. Your operating model must cover incident response, patching and upgrades, either with your own staff or through a fixed-scope support agreement. Ask any implementation partner to state in writing which of these responsibilities they take on.
What a move from Stripe Billing to Kill Bill involves
The sequence moves billing logic into a self-hosted Kill Bill server while Stripe keeps processing cards, so each invoice has exactly one owner at every point in the cutover. Each step ends with a check that tells you whether the next step can start.
Inventory catalogs, subscriptions, invoices and usage
Your finance and billing engineers export a complete picture of what Stripe Billing holds: products and prices, active and paused subscriptions, trial and proration rules, open and historical invoices, credit balances, and metered usage. Stripe's own API and dashboard exports are the starting point, and the field-level details belong to the data export and Stripe-to-Lago pages in this group. You know this step is done when every active subscription can be traced to a customer, a price and a billing cycle in a single inventory document that finance has signed off.
Stand up Kill Bill in a non-production environment
Your platform team deploys the Kill Bill server in a Tomcat container, with the Kaui back-office UI and a supported database, in an environment that cannot send live charges. The Kill Bill getting started documentation lists the JDK version and database options, and the core team's regression tests use MySQL and MariaDB, so confirm your database choice against the current release notes. You know this step is done when the server starts, answers REST calls, and Kaui can create a test account and a test subscription.
Configure the Stripe payment plugin
Your engineers install the Stripe payment plugin as a JAR alongside the Kill Bill server and point it at a Stripe test account with restricted API keys, so Kill Bill handles payment calls and Stripe stays the processor. Keep webhook endpoints separate between test and live. Confirm the plugin version against the Kill Bill release you chose, since plugins are versioned independently. You know this step is done when a test invoice is paid through the plugin and the payment appears in both Kill Bill and the Stripe test dashboard with matching identifiers.
Map customers, products and subscriptions
Your billing team builds a mapping table that links each Stripe customer and payment method to a Kill Bill account, each Stripe price to a Kill Bill catalog plan, and each active subscription to its Kill Bill equivalent, including billing anchor dates. Payment method references are reused, not re-collected from cardholders. Rules for credits and proration must be written down and tested with sample accounts. You know this step is done when every row in the inventory has exactly one mapped target and a reviewer has checked a sample of accounts against the source data.
Run parallel invoice generation
For a defined set of test accounts, Kill Bill generates invoices for the next billing cycle while Stripe Billing still generates the live invoices. Finance compares line items, taxes, credits and totals for each pair, and your engineers log every difference by cause. Tax and fraud plugins, if used, are validated in the same run. You know this step is done when a full billing cycle has produced matching invoices for the sample set and every remaining difference has a documented and accepted cause.
Cut over without double charging
Your team stops invoice generation in Stripe Billing for each migrated cohort on a single cutover date, disables Stripe's automatic subscription charges for those customers, and enables Kill Bill's invoice and payment runs in the same change window. Scheduled retries and dunning jobs are moved to one system only. A freeze on manual charges during the window is part of the runbook. You know this step is done when a reconciliation of the first post-cutover cycle shows each customer charged once, with no open Stripe subscription still able to bill.
Retire Stripe Billing objects
Once the post-cutover cycles reconcile and the audit trail for the migrated period is archived, your team cancels remaining Stripe subscriptions, archives or deactivates unused prices and products, and removes billing webhooks that are no longer needed. Payment records stay in Stripe for refunds, disputes and reporting. Confirm with your auditors and accounting team which historical records must be retained and where. You know this step is done when Stripe lists no active billing objects for the migrated cohort and the retention plan for historical data has been signed off.
Questions buyers ask before choosing Kill Bill over Stripe Billing
What does it cost to move billing logic from Stripe Billing to Kill Bill?
The switch cost is driven by the work, not by a license fee, because Kill Bill is licensed under the Apache License 2.0. The main one-time costs are migration of catalogs, subscriptions and invoice history, testing against your payment gateway, and setting up the hosting and database. Recurring costs are the servers, database backups, monitoring, upgrades and staff or a support retainer. Stripe's share of billing volume stops, but Stripe processing fees continue because Kill Bill connects to gateways such as Stripe. Ask any implementation partner for a written quote based on your catalog size, subscription count, number of gateways and environments, and check whether upgrades and support are priced separately.
How long does a Kill Bill migration take?
The timeline depends mostly on your data and your integrations, not on the software itself. Teams with a small product catalog and a few subscription plans face a different workload from teams with complex usage metering, tax rules, dunning logic and many webhook consumers. Parallel running, where Stripe and Kill Bill both generate invoices for a period, usually adds time because finance has to reconcile both. Ask for a phased plan in writing that names the data sets in scope, the test cycles and the cutover criteria, and confirm the duration with the partner against your own inventory of subscriptions and integrations.
Can an internal team run Kill Bill without outside help?
An internal team can run Kill Bill if it has the engineering capacity and operational discipline to own a Java server in production. Kill Bill is a standalone server packaged as a WAR file and typically run in Tomcat, with plugins deployed as JARs in the same environment. The project and the Billing Project, LLC do not include support or an SLA with the open-source release, so your team handles incident response, patching and upgrades. Many organizations combine internal ownership with a retainer for upgrades and testing. Decide which of these you will own before you commit, and confirm the scope of any outside retainer in writing.
What Java and database skills does Kill Bill require?
Your team needs Java operations skills to deploy and tune the server, and database skills to manage the schema, backups and performance. The Tomcat installation guide requires JDK 11. The Kill Bill core team uses MySQL and runs regression tests against MariaDB 10 and PostgreSQL 12, and the getting started guide notes that users have also deployed it with Oracle, Percona and Aurora databases. Choose a database your team already operates, and confirm the exact versions and supported configurations with the current documentation before you build. Plugin development for gateways not already covered needs Java developers who can read the plugin APIs.
Is Kill Bill production-ready, and what support is available without an SLA?
Kill Bill has been in production since 2010, according to its README, and the latest release in the 0.24.x line is 0.24.22, published on September 29, 2026. Production readiness still depends on your own testing, configuration and operating model. Without a commercial agreement, you rely on community channels, the documentation and the release notes, and no service level is included. Before selecting a path, ask your partner what support, response coverage and upgrade testing they will provide in writing, and decide how your internal team will respond to a payment or invoice incident outside business hours.
Can Stripe card data move to Kill Bill?
Card data does not move from Stripe to Kill Bill through a simple export, because Kill Bill is a billing system and not a card vault. In most designs, Stripe remains the processor that holds card credentials, and Kill Bill references the Stripe customer and payment method through its gateway plugin. If you need to move stored card data to another processor, Stripe's encrypted export is available only to a PCI DSS Level 1 compliant receiving party, and the export process is handled through Stripe's own documentation. Confirm the export options, timing and eligibility with Stripe and your receiving processor before you plan a cutover.
Which compliance evidence does a Kill Bill deployment need?
Compliance readiness depends on the controls you can show for the systems that handle payment and billing data. For a Kill Bill deployment, that usually means documented access controls, change management, backup and restore testing, logging and a clear boundary between billing and card data. DeployOpen prepares systems, controls and evidence for compliance assessments, but independent auditors and certification bodies issue the reports and attestations. Ask your assessor which control areas they will test and what evidence they expect, and confirm the scope in writing before the engagement starts.
When staying on Stripe Billing is the better choice
Staying on Stripe Billing is the right call for many teams, and the case rests on operations rather than on cost alone. Stripe runs the billing service, its upgrades, its uptime and its handling of payment data, so your engineers do not need to operate a Java server, a Tomcat container, a database tier and the plugins that connect them. With Kill Bill, the platform work moves to your team: the WAR deployment, the JDK version required by the installation guide, the database engine, Kaui access controls, plugin releases and backups all become your responsibility. Kill Bill's own project notes that it ships with no support or SLA, so the operating burden is yours in full.
Stripe Billing is usually the better fit when the catalog is small and changes rarely, when the team has little capacity to run a second production system, and when billing records do not have to be hosted by you. A product with a handful of plans, standard tax handling and no unusual proration rules gains little from owning the invoice engine. A single vendor for payments and billing also reduces the number of contracts, incident channels and data flows that a security or compliance team must review. Confirm these conditions before deciding: count your active plans and add-ons, list the proration and credit rules you rely on, and check whether your regulators or customers require billing records in your own environment.
Staying put is not a permanent answer, and it should be reviewed against the same criteria used for a migration. Revisit the decision if the catalog grows into custom pricing that Stripe cannot express without workarounds, if you need several gateways beyond Stripe, if the fee base grows faster than the value of managed operations, or if a data residency rule applies to invoices and customer billing history. Before renewing, ask Stripe in writing which billing features, data exports and retention terms apply to your account, and document what it would take to leave, so the choice stays a deliberate one.
How DeployOpen helps evaluate, implement or migrate Kill Bill
DeployOpen is a Chainscore Labs company that plans, implements, integrates, hardens, backs up, documents and supports self-hosted open-source platforms inside your own cloud accounts, data centers or air-gapped networks. For Stripe Billing vs Kill Bill, we work from the billing rules, payment flows and data you have today, so the decision and any migration rest on your own environment.
How we scope
- Engagements are fixed-scope, with scope and deliverables agreed in writing before work starts.
- The written scope lists which catalogs, subscription rules, invoice flows and gateway connections Kill Bill must cover.
- We confirm which Stripe features stay in place as the payment processor and which billing functions move in-house.
How we build
- We deploy Kill Bill as a Java WAR in Tomcat with JDK 11, inside your infrastructure, as the scope specifies.
- We configure the Stripe payment plugin and any other gateway plugins, then test subscription, upgrade, downgrade and invoice behavior.
- We set up Kaui for internal finance and support teams, with role-based access matched to your approval process.
How we hand over
- Handover includes architecture, configuration and runbook documentation for the deployed Kill Bill environment.
- We document the database choice, backup and restore procedures, and plugin versions so your team can operate them.
- We prepare controls and evidence for compliance assessments, while independent auditors and certification bodies issue any opinion.
How we support
- Ongoing support, upgrades and continuous testing are available as retainers after handover.
- Retainers can cover Kill Bill version upgrades, plugin updates and regression testing against your billing scenarios.
- Confirm with us during scoping which support levels, response expectations and service terms apply, since Kill Bill itself ships without an SLA.
