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Equilipy review

Free#17 of 33 in Chemistry Simulation Software

A focused tool for computational phase-equilibrium, with Python workflows and a desktop GUI.

6.8/10Editor score
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Reviewed by iTechGuides Editors · Editorial team · Updated Oct 2026

Equilipy is an open-source Python package for multicomponent, multiphase chemical equilibrium calculations using the CALPHAD approach. It is aimed at researchers and engineers working on thermodynamics, alloy design, and computational phase-equilibrium rather than users seeking a general chemistry lab simulator. Given conditions such as composition, pressure, and temperature, it calculates equilibrium phases, their amounts and compositions, and thermochemical properties including G, H, S, and Cp. The project is provided by Oak Ridge National Laboratory, a U.S. Department of Energy laboratory.

Its strongest fit is the combination of equilibrium, database, and solidification workflows. Equilipy reads ChemSage/FactSage DAT and Thermo-Calc TDB databases, and supports batch equilibrium calculations plus Scheil-Gulliver and NucleoScheil solidification models. MPI helpers extend batch calculations to multi-node workflows. A desktop GUI offers calculation and database workspaces, alongside the Python package, so it can support both interactive setup and scripted computation. An AI-assist panel is also included for setting up calculations; the core value remains the thermodynamic calculation workflow.

Equilipy is distributed as open-source software under the BSD 3-Clause License, with a free plan and no paid tiers described. It runs on Windows, macOS, and Linux, and documentation is the stated support channel. This makes it a sensible choice for teams comfortable with scientific computing and managing thermochemical inputs who need CALPHAD-based multiphase or solidification analysis. It is less suitable for general-purpose chemistry simulation, browser-based collaboration, or buyers looking for a conventional commercial plan and broader support channels.

Equilipy pros and cons

  • Where it wins
    • Calculates multicomponent, multiphase equilibrium with CALPHAD minimization
    • Reads ChemSage/FactSage DAT and Thermo-Calc TDB databases
    • Includes batch, solidification and MPI-assisted calculations
  • Where it doesn't
    • Focused on thermodynamic computation, not general chemistry lab simulation
    • Requires thermochemical databases and composition, pressure and temperature inputs
    • Desktop GUI and documentation support may not suit browser-first workflows

Equilipy fact sheet, pricing and score →

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