A maintained home for your STAN models
STAN (TU Wien) taught a generation of engineers how to do substance flow analysis, and its last release dates from February 2022. If you rely on it, here is a serious, actively developed alternative that opens your files.
| STAN 2.7 | OpenSankey / MFASankey | |
|---|---|---|
| Status | Freeware, last release 2022 | Actively developed, open-source core |
| Platform | Windows desktop (Mac/Linux executables since 2025) | Any browser, nothing to install |
| Data reconciliation | Error propagation & data reconciliation per ÖNorm S 2096 | Constrained reconciliation + completion from ~10% of measured data |
| Uncertainty | Yes | Yes, propagated end-to-end |
| Multi-period / scenarios | Periods and layers | Data tags: years, scenarios, any dimension, switchable live |
| Sharing results | Static exports | Interactive published diagrams, embeddable in any site |
| Your existing files | None | .smfa and .zmfa import built in |
| Price | Free | Free editor; MFA engine €1,500/year or €150/month (public pricing), one-month free trial. Academic access available. |
What we respect about STAN
STAN is rigorous, free, and backed by the MFA Handbook (Brunner & Rechberger). It became the de-facto standard in teaching for good reasons. If it still fits your workflow, keep using it. Our importer means you never have to choose upfront: your models stay portable.
When to switch
Switch when you need collaboration in the browser, when your study has more scenarios and years than STAN's periods can comfortably hold, when stakeholders want an interactive result rather than a PDF, or when you want the data collection (Excel templates), reconciliation and publication in one pipeline.
Teaching MFA? Ask us about classroom and academic access: see pricing.
See a STAN model open in the browser
A real .zmfa file, with its processes, its two periods and its stocks, laid
out exactly where STAN drew them. Click it; nothing to install.
