Spendlog
Cost & expense tracking for solo entrepreneurs, right inside Claude Code. No apps. No spreadsheets. No account.
Track what your business spends, manage budgets, write invoices — all in natural language. Your data stays 100% local in SQLite. Nothing leaves your machine.
Works with
Claude Code | Claude Desktop | VS Code | Cursor
Quick Start
Or one-click install:
The installer auto-configures Claude Desktop and Claude Code. Restart Claude, then try:
"Track 50€ for hosting"
That's it. Requires Node.js 20+.
Why Spendlog?
- Zero context-switching — log costs while you build, right where you already work
- Local-first — all data in
~/.spendlog/spendlog.db, no account, no cloud
- Natural language — no forms, no menus, just tell Claude what you spent
- 38 tools — invoicing, budgets, recurring expenses, CSV export, multi-project tracking
- Multilingual — English and German (EN/DE), with i18n ready for more
Examples
Tracking:
You: "29€ for ChatGPT subscription"
Claude: Expense saved: 29.00 € — Category: IT & Software
You: "Export 2025 for my accountant"
Claude: 247 transactions written to ~/spendlog-export-2025.csv
Invoices:
You: "Create invoice for TechCorp, web development, 8h at 95€/h"
Claude: Invoice #2026-004 created — 760.00 €
You: "Mark it as paid"
Claude: Invoice #2026-004 marked as paid, income recorded.
Analysis:
You: "How much did I spend on software this quarter?"
Claude: IT & Software: 287.00 € (12 transactions) — 23% of total expenses
You: "Compare January vs February"
Claude: Expenses up 15%. Biggest increase: Marketing (+120€)
38 tools across 9 categories:
| Category | Tools |
|---|
| Transactions | add_expense add_income list_transactions update_transaction delete_transaction |
| Analysis | get_summary get_category_breakdown compare_periods get_tax_summary |
| Invoices | create_invoice list_invoices get_invoice mark_invoice_sent mark_invoice_paid delete_invoice duplicate_invoice |
| Budgets | set_budget get_budget_status list_budgets update_budget delete_budget |
| Recurring | create_recurring list_recurring delete_recurring process_recurring |
| Projects | create_project list_projects rename_project delete_project |
| Categories | list_categories add_category delete_category |
| Export | export_transactions export_invoices export_for_tax_advisor |
| Settings | get_profile set_profile get_notifications |
Configuration
Manual setup (if the installer didn't work)
Claude Desktop — edit your config file:
{
"mcpServers": {
"spendlog": {
"command": "npx",
"args": ["-y", "--package=spendlog", "spendlog-mcp"]
}
}
}
Claude Code:
claude mcp add spendlog -- npx -y --package=spendlog spendlog-mcp
Environment variables
| Variable | Description | Default |
|---|
SPENDLOG_LANGUAGE | en or de | en |
SPENDLOG_DATA_DIR | Data directory path | ~/.spendlog |
DATABASE_PATH | Full path to SQLite database | $SPENDLOG_DATA_DIR/spendlog.db |
SPENDLOG_PROJECT | Default project for all transactions | none |
Privacy
All data stays on your machine, in a local SQLite file. No account, no cloud, no telemetry — nothing is ever sent anywhere.
Note: Spendlog is a cost tracker, not accounting software. Use it for your own insights, not official bookkeeping or tax filing.
Development
TypeScript (strict), Vitest for tests, TypeORM + SQLite for storage.
git clone https://github.com/makz81/spendlog.git
cd spendlog
npm install
npm run dev
npm run test
npm run typecheck
See CONTRIBUTING.md for architecture details and how to add new tools.
License
MIT