About Billr
Billr is open-source invoicing with a built-in MCP server. Connect Claude Code, Codex, Cursor or any MCP client over OAuth, and your agent can log time, track expenses, draft estimates and send invoices using 53 tools, all under bookkeeper-level permissions. Every action an agent takes is badged in a single dashboard. Use the hosted version at billr.cc for $19/month (14-day free trial, no platform fee) or self-host it free under Apache-2.0.
What Billr does
AINave analysisLets users and their AI coding agents log billable work, draft invoices and send them to clients.
- Best for
- Small businesses that bill clientsDevelopers who use AI coding agentsIndependent contractors
- Use it to
- Logging billable time after work sessions
- Drafting and sending client invoices
- Tracking business expenses
- Running a month-end invoice draft batch
- Drafting overdue payment reminders
- Drafting estimates
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