Lago
An open-source API for metering and usage-based billing, supporting hybrid pricing models and self-hosting.
What is Lago?
Lago is an open-source API for metering and usage-based billing, designed to automate consumption tracking, subscription management, and invoicing for SaaS companies. It solves the engineering nightmare of implementing flexible billing systems by providing an event-based, programmable solution that supports hybrid pricing models.
Engineers and product teams at SaaS companies, especially those with product-led growth models, who need to implement or scale usage-based or hybrid billing without relying on proprietary solutions.
Developers choose Lago for its open-source, self-hostable nature, avoiding vendor lock-in and revenue-based fees. It offers composability with existing tools, data privacy by keeping data on your infrastructure, and flexibility for hybrid pricing and go-to-market motions.
Overview
Open Source Metering and Usage Based Billing API ⭐️ Consumption tracking, Subscription management, Pricing iterations, Payment orchestration & Revenue analytics
Use Cases
Best For
- Implementing usage-based billing for API or infrastructure products
- Managing hybrid pricing models with both subscription and pay-as-you-go components
- Self-hosting billing infrastructure to maintain data privacy and control
- Automating invoicing and revenue analytics for SaaS businesses
- Creating custom pricing plans without relying on proprietary billing vendors
- Handling complex billing scenarios like prepaid credits and one-time add-ons
Not Ideal For
- Companies seeking a fully managed, plug-and-play billing solution with minimal setup and maintenance
- Businesses with only simple, flat-rate subscription models and no usage-based components
- Teams already deeply integrated with proprietary billing systems who prefer seamless migration without custom integration work
Pros & Cons
Pros
Lago's architecture allows charging for any trackable event, enabling complex usage-based pricing models as emphasized in the features section.
It avoids revenue-based fees common in proprietary solutions, offering a free self-hosted version and transparent SaaS pricing, as stated in the philosophy.
Designed for both subscription and usage components, it addresses modern SaaS needs, with templates for companies like Algolia and Segment.
Self-hostable option ensures customer data stays on your infrastructure, enhancing security and compliance, as highlighted in the open architecture section.
Cons
Requires Docker and manual configuration with environment variables, which can be complex and time-consuming for teams without dedicated DevOps expertise.
Launched in 2022, it may lack the stability, extensive integrations, and community support of established solutions like Stripe Billing or Chargebee.
The copyleft license might not be suitable for all commercial use cases, especially in proprietary software environments, requiring careful legal consideration.
Open Source Alternative To
Lago is an open-source alternative to the following products:
A subscription billing and revenue management platform that handles recurring payments, invoicing, and revenue recognition for businesses.
Chargebee is a subscription billing and revenue management platform that helps businesses automate recurring payments, invoicing, and subscription lifecycle management.
Stripe Billing is a subscription and invoicing platform by Stripe that handles recurring billing, pricing models, and revenue recognition.
Frequently Asked Questions
Related Projects
CGRateSReal-time Charging System for Telecom & ISP environments
Socially Optimal Pricing of Cloud Computing Resources“The socially optimal operating point is unique, and can be sustained by a linear, usage-based tariff, which charges a fixed price per unit resource and unit time.” This paper justify usage-based pricing for cloud resources
Allen's interval algebraImplementing usage-based pricing is tricky, and this algebra will help you organize temporal reasoning. Also see this Stack Overflow question with clean schema
Use-cases for cloud servicesThe reason usage-based pricing makes even more sense for cloud services: to optimize ROI, keep all regular workload in traditional architecture and reserve cloud computing for elastic and experimental projects
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