§ products / billboy

BillBoy

Open-source invoicing, time tracking and bookkeeping for freelancers and small agencies — built to disappear into the rest of your workflow.

01 What it is

BillBoy is a web application built by APIgoat and published as open source. It covers the path from a client and a project to a clean, client-ready invoice, with the hours and expenses that justify it.

02 What it does

  • Clients and projects, with billable time logs that compare plan and actual.
  • Expenses with receipts, and AI-powered scanning of receipts and business cards.
  • Multi-currency invoices, clean enough to send as they are.
  • Role-based access for a small team.
  • A REST API and an MCP server, so an AI assistant can log time or draft an invoice under your permissions.

03 How it is built

BillBoy is generated by GoatCheese, APIgoat's schema-driven build engine: the database, admin interface, API, permissions and MCP server all come from one schema.

04 Get it

Use it at billboy.apigoat.com, or read and host the code yourself from github.com/drez/billboy.