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OPEM

Free plan APILinuxWebWindows

What OPEM is

OPEM is a free, open-source application for modeling and evaluating proton-exchange membrane fuel-cell performance. Its project documents eight models: three static and five dynamic. Generic models accept operating variables such as feed gases, pressure, composition, temperature, and current density, together with cell parameters including active area and membrane thickness. Outputs include power, current, voltage, efficiency, and thermal power. Reports can be produced as CSV, OPEM, or HTML files. Desktop use is documented from a Windows Command Prompt or UNIX terminal, including through OPEM.exe. Python users can import the models and call their analysis functions. OPEM can also run in interactive Jupyter notebooks through Binder, and a Telegram bot supports selecting a model, submitting a test vector, and downloading results. Listed platforms are API, Linux, web, and Windows, with offline access. ECSIM describes it for applied electrochemistry researchers, including fuel-cell researchers. The repository uses an MIT license. Bug reports can be filed as issues or emailed to [email protected], with a Discord server also mentioned.

Who it suits

OPEM suits applied electrochemistry researchers and others working with fuel-cell models. It fits users who need desktop, Python, notebook, terminal, or Telegram workflows.

What it does well

Eight documented static and dynamic models
Produces CSV, OPEM, and HTML reports
Supports Python model imports
Runs through Binder notebooks
Available offline under an MIT license

What to know first

Focused on proton-exchange membrane fuel cells
Terminal use requires Windows or UNIX environments
Telegram workflow requires submitting a test vector

Plans

Plan	Billed and limits	Price
OPEM	Open-source PEMFC simulation tool	Free

As ecsim.site lists them, read 11 Oct 2026. The maker's own page has the final word.

Verdict

OPEM provides free fuel-cell modeling through desktop, Python, notebook, and Telegram routes. Its documented inputs and outputs make the available analyses explicit for research workflows.

Facts from OPEM's own pages

Delivery mode: desktop · ecsim.site, 23 Sept 2026
Desktop use: The README describes running OPEM from Windows Command Prompt or a UNIX terminal, including through OPEM.exe. · github.com, 11 Oct 2026
Free plan: Yes · ecsim.site, 23 Sept 2026
Inputs: Its generic models accept operating variables such as feed gases, pressure, composition, temperature and current density, plus cell parameters such as active area and membrane thickness. · ecsim.site, 11 Oct 2026
Intended users: ECSIM describes its software as open-source simulation tools for applied electrochemistry researchers, including people working with fuel cells. · ecsim.site, 11 Oct 2026
License: The GitHub repository lists an MIT license. · github.com, 11 Oct 2026
Models: The project README documents eight models: three static and five dynamic. · github.com, 11 Oct 2026
Offline access: Yes · ecsim.site, 23 Sept 2026
Online access: The README says OPEM can run in interactive Jupyter notebooks through Binder. · github.com, 11 Oct 2026
Purpose: OPEM models and evaluates proton-exchange membrane fuel-cell performance using static and dynamic models. · ecsim.site, 11 Oct 2026
Python library: The README documents importing OPEM models from Python and calling their analysis functions. · github.com, 11 Oct 2026
Report formats: The README says report mode can generate CSV, OPEM and HTML files. · github.com, 11 Oct 2026
Results: The README lists power, current, voltage, efficiency and thermal power among model outputs. · github.com, 11 Oct 2026
Support: The README directs users to file an issue or email [email protected] for bug reports, and mentions a Discord server. · github.com, 11 Oct 2026
Telegram bot: The README describes a Telegram bot workflow for choosing a model, submitting a test vector and downloading results. · github.com, 11 Oct 2026

Where OPEM stands on Freedom251

Physics Simulation Software#27 of 89