effmass
effmass: A focused Python package for extracting and fitting effective masses from band-structure data. Ranked #75 of 89 in Physics Simulation Software by our editors (3.0/10); pricing: Free plan; best for researchers analyzing electronic effective masses.
At a glance
- Editor score3.0 / 10
- PricingFree plan
- Best forResearchers analyzing electronic effective masses
- Free planYes
- Paid fromFree
- Facts checked23 Sep 2026
Where it wins
- Analyzes conduction- and valence-band extrema
- Supports effective-mass fitting workflows
- Free, open-source Python package with installation and usage docs
Where it doesn't
- Focused on effective-mass analysis rather than broader simulation
- Requires use in a local Python environment
- Documentation is the listed support channel
Our verdict on effmass
For researchers working with semiconductor and materials electronic-structure calculations, effmass is a Python package for extracting and calculating electronic effective masses from band-structure data. It analyzes conduction- and valence-band extrema and supports effective-mass fitting workflows. The package runs in a user's own Python environment, making it an analysis tool rather than a hosted learning platform or browser application.
Its scope is deliberately specific: the documented workflow covers installation, input data handling, identifying band extrema, and effective-mass analysis. Python interfaces suit researchers who want to incorporate the analysis into programming-based work. This focus is useful when effective masses are the task at hand, but effmass is not positioned as broader simulation or visualization software. Researchers looking for a package centered on effective-mass extraction may find that narrow remit a good fit; those seeking a wider simulation environment should consider alternatives.
effmass is open source and has a free plan, so there is no paid tier distinction to weigh in choosing it. The documentation is its listed support channel, and users need to run the package locally in Python. That favors people comfortable installing and working with Python software, rather than those who want a browser-based interface or a hosted workflow. Choose effmass for focused, documented effective-mass analysis; look elsewhere if your priority is a broader platform or a different support model.
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effmass pricing
effmass fact sheet
| Free plan | Yes |
|---|---|
| Paid from | Free |
| Delivery mode | Not verified |
| Lesson library | Not verified |
| Authoring tools | Not verified |
| Assessment tools | Not verified |
| 3D visuals | Not verified |
| Offline access | Not verified |
| Data export | Not verified |
| Support | Docs |
| Built for | Solo, Small business, Mid-market, Enterprise (editorial estimate) |
| Pricing | Free plan |
| Website | effmass.readthedocs.io |
| Facts checked | 23 Sep 2026 |
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Reviewed by iTechGuides Editors · Editorial team · Updated Oct 2026
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