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Lago

Open-source billing and metering API

Budgeting & Finance ★ 10.3k stars Hard setup AGPL-3.0

Lago is an open-source metering and usage-based billing platform. It helps SaaS companies build complex pricing, invoicing, and subscription billing with a developer-friendly API.

Key features

  • Usage-based metering
  • Flexible pricing models
  • Invoicing and credit notes
  • Webhooks and API-first

Pros & cons

Strengths

  • Powerful for SaaS billing
  • Developer-friendly

Trade-offs

  • Complex multi-service stack
  • Overkill for simple invoicing

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