SlimFact

Open-source, API-first invoicing engine you can self-host or embed as a headless billing backend.

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SlimFact is an open-source, API-first invoicing engine that businesses can self-host for free or run on a small managed cloud plan. Built with a type-safe tRPC API and customizable PDF templates, it supports online payments through Mollie or Stripe. It suits developers who want to embed invoicing into their own software as well as small businesses handling billing directly.

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