ProjectEngine

Excel-native dependency-driven planning engine focused on transparency, simulation, diagnostics, and project controls workflows.

Open-source Excel/VBA project planning engine for dependency-driven schedule calculation, scenario analysis, and project controls reporting.

ProjectEngine turns an Excel workbook into a lightweight planning engine with native VBA scheduling logic, Gantt rendering, S-curve analytics, constraints, floats, and runtime diagnostics.

Screenshots

WBS Inputs

Planning Analytics

S-Curve

Runtime Diagnostics

Features

• Dependency-driven scheduling with FS / SS / FF relationships and lag support

• Baseline / Forecast / Actual planning logic

• Incremental recalculation with forced full recalculation option

• Critical Path, Total Float, Free Float, and Longest Path analytics

• Multi-network / multi-project criticality mode

• Hard constraints engine with dedicated constraint table

• Soft Deadline analytics with Deadline Float and warnings

• Gantt chart generation with timeline, links, milestones, constraints, and analytics overlays

• Live / Test planning simulation without committing changes

• Scenario workflow with fork-to-new-planning capability

• S-curve data generation and analytics

• Runtime console with INFO / WARNING / STOP severities

• Event History and Alarm History tables for audit/debug

• Warning hide/acknowledge system based on stable event signatures

• WBS input validation and guarded system writes to calculated columns

Architecture

The project is structured around a VBA scheduling core and separate projection layers:

• WBS is the user-facing planning input and output table.

• CALC is the runtime calculation layer.

• CONSTRAINTS stores hard constraints and deadlines.

• GANTT is a visual projection of the calculated schedule.

• EVENT\_HISTORY, CALC\_ALARM, and EVENT\_ACK provide runtime diagnostics and warning management.

The Gantt and reporting layers do not drive the schedule calculation. They consume calculated outputs from the planning engine.

Status

Active development — alpha.

The engine is functional and under continuous hardening. APIs, workbook structure, and VBA module organization may still evolve.

Support the Project

If ProjectEngine helps your work and you want to support ongoing development:

License

GPL v3