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SlowBooks Pro icon

SlowBooks Pro

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Free, source-available accounting software with no caps - payroll, inventory, unlimited invoicing, and Ai analytics, with all data stored locally on your computer.

SlowBooks Pro screenshot 1

Cost / License

  • Free
  • Proprietary

Application type

Platforms

  • Mac
  • Windows  64-bit Windows 10/11 only. Signed self-contained installer - no dependencies to install.
  • Linux  No packaged build - run via Docker (recommended) or install natively with PostgreSQL and Python.
  • Docker
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SlowBooks Pro was added to AlternativeTo by traxx822 on and this page was last updated .

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What is SlowBooks Pro?

A free bookkeeping and accounting application for Windows, macOS, and Linux, built as a clean-room replacement for QuickBooks 2003 Pro. It includes double-entry accounting, unlimited invoicing and estimates, full US payroll with tamper-evident W-2/940/941 tax forms, perpetual inventory with automatic COGS, bank reconciliation with OFX/QFX import, a real-time analytics dashboard, and optional bring-your-own-key AI analysis (7 providers, including self-hosted). There are no invoice caps, revenue ceilings, trials, or paid tiers. Every company is a single local file - no cloud, no account, no telemetry. Windows gets a code-signed native installer; servers, macOS, and Linux use Docker. Imports from QuickBooks Desktop via IIF and syncs with QuickBooks Online.