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

npx spendlog

Or one-click install:

Install in VS Code Install in Cursor

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€)

Tools

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

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       # MCP server with watch mode
npm run test      # 382 tests
npm run typecheck # type check (no emit)

See CONTRIBUTING.md for architecture details and how to add new tools.

License

MIT