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:

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