Budgero is an open-source, end-to-end encrypted zero-based budgeting app in the YNAB mold — manual-first entry with rule-based automation, multi-currency support, and YNAB/CSV import. Ships as a single Go binary with SQLite storage and typically runs in under 200MB RAM. IMPORTANT: set "Allowed sync origins" to the exact origin you open the app from (e.g. http://192.168.1.50:3001 or https://budget.example.com). The sync WebSocket rejects connections from any other origin and the budget will not load. Exact match on scheme/host/port, no wildcards.