Open Calc Studio

Open Calc Studio is a desktop application for construction cost estimating: a
free, open replacement for legacy Dutch estimating tools (BasCalc, WPCalc),
built with an open, human-readable file format — no vendor lock-in.

Estimating:
- Hierarchical estimate structure (chapter -> cost item -> line item)
- Cascading markup calculation (subcontractor surcharge, overhead,
guarantees, preparation, risk, profit, insurance, VAT, rounding)
- Resource classification (labor / material / equipment / subcontractor /
other) with productivity norms per line
- Rate groups with configurable hourly rates
- Estimate variants (a git-like branching model)
- Scale an hours total (overall, per rate group, or per chapter) and the
underlying norms scale with it
- Embedded spreadsheets for sub-calculations, with cell formulas
- Snapshots/versions of an estimate, and silent autosave

Import & export:
- BasCalc and WPCalc (legacy Dutch estimating formats), including
round-trip read/write for WPCalc
- IBIS-TRAD (SQLite) import, including resources and wage codes
- IFC 4.x (IfcCostSchedule/IfcCostItem) import and export
- CUF-XML, TRADXML, and RAW RSX export
- Excel (.xlsx) import
- Its own open, human-readable format (.ocs / .ifcCalc)

Reporting:
- Seven report views (work description, main contract, subcontract,
tender schedule, actual-cost, and two Dutch industry-standard formats)
- Live print preview and PDF export

Also included:
- Office-style ribbon UI, multi-document support, 4 themes, fully
keyboard-operable
- Optional OpenAEC account: sign-in via the system browser, cloud storage
for estimates, and an AI assistant billed against your account credit
- An MCP server for driving estimates from an AI assistant, plus a plugin
architecture for custom importers

Open Calc Studio is free and open source (MIT), part of the OpenAEC
Foundation family of applications, and built with Tauri for a small,
native footprint.