Kill Bill
Billing software
Accounting & finance software
Bill printing software
Expense billing software
Recurring billing software
Salon billing software
- Features
- Ease of use
- Ease of management
- Quality of support
- Affordability
- Market presence
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$40 per month
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What is Kill Bill
Kill Bill is an open-source billing and payments platform designed to support subscription and usage-based billing workflows. It is typically used by engineering-led teams that need to embed billing logic into custom applications rather than adopting an all-in-one finance suite. The platform provides APIs and a plugin architecture for integrating payment gateways, tax, invoicing, and accounting exports. It is commonly deployed and operated by the customer, which shifts responsibility for hosting, security, and ongoing maintenance to the implementing organization.
API-first billing platform
Kill Bill exposes core billing functions through APIs, which supports embedding billing into web and mobile products. This approach fits teams that need programmatic control over subscriptions, invoicing, and payment flows. It also enables integration with existing customer, product, and data systems without relying on a bundled CRM or project-management layer.
Extensible plugin architecture
Kill Bill uses a plugin model to extend or replace components such as payment processing, tax calculation, and notification workflows. This helps organizations adapt billing behavior to specific business rules and regional requirements. Compared with packaged SMB billing tools, the extensibility can reduce the need for workarounds when requirements are non-standard.
Self-hosted deployment option
As open-source software, Kill Bill can be deployed in customer-controlled infrastructure, which can help meet internal security, data residency, or customization requirements. Teams can inspect and modify source code when needed. This is useful for organizations that cannot use multi-tenant SaaS billing systems due to policy constraints.
Implementation requires engineering effort
Kill Bill is not a turnkey billing application; it typically requires developers to integrate APIs, configure plugins, and build customer-facing billing experiences. Organizations should plan for architecture, testing, and ongoing operations. This can be heavier than adopting a preconfigured billing tool that includes UI, templates, and guided setup.
Limited out-of-box business UI
Kill Bill focuses on platform capabilities rather than a complete business suite experience. Teams may need to add or build administrative interfaces for finance operations, customer support workflows, and reporting. Companies expecting integrated CRM, proposals, or end-to-end accounting features may need additional systems.
Operational ownership and support
Self-hosting shifts responsibility for uptime, monitoring, upgrades, and security patching to the customer. Support depends on internal expertise and any commercial support arrangements rather than a single SaaS vendor SLA by default. This can increase total effort for smaller teams without dedicated DevOps and billing domain expertise.
Plan & Pricing
| Plan | Price | Key features & notes |
|---|---|---|
| Kill Bill Open-Source | Free | Apache 2.0 open-source core; self-hosted, full control, community-driven upgrades and docs. |
| Kill Bill for AWS (Marketplace) | ~ $40 per month (software fees) | AWS Marketplace distribution with cloud-native integrations and AWS-specific closed-source extensions; plus AWS usage charges. |
| Kill Bill Aviate (Enterprise Accelerator) | Contact sales — flat annual fee (enterprise pricing) | Production-ready accelerator built on open-source core; fixed annual fees (not revenue %); prebuilt catalog, taxation, multi-currency, audit tooling. Example on site: Aviate + Growth Support estimated ~$50k–$75k for a $25M ARR scenario (illustrative). |
| Support — Tier 2: Growth Support (Low-touch) | Contact sales (flat annual fee) | Best for $5M–$50M ARR; Slack access to core team; up to 4 hrs/week guidance; quarterly or annual contract. |
| Support — Tier 1: Enterprise Success Plan (High-touch) | Contact sales (flat annual fee) | Recommended for $50M+ ARR; 48-hour SLA for critical production issues; priority engineering; annual contract. |
| Consulting (expert time) | $800 per 4-hour block | Consulting via private Slack channel with Kill Bill core team (short-term engagement blocks). |
Seller details
Kill Bill, Inc.
San Francisco, California, United States
2010
Private
https://killbill.io/
https://x.com/killbilling
https://www.linkedin.com/company/kill-bill
