Sankey diagrams that go all the way
to material flow analysis
Build interactive Sankey diagrams in your browser, then, when you need it, reconcile incomplete or inconsistent data with a full MFA engine. Import from Excel, STAN or SankeyMATIC. Free to start, no account needed.
One tool, three levels of depth
Start with a drawing. End with a defensible material balance.
OpenSankey
The free, open-source editor. Draw and style Sankey diagrams, import 3-column data, export images. No account, no watermark.
Start drawing
OpenSankey+
Professional dataviz: hierarchical nodes with drill-down, data tags to switch years/scenarios, views, published interactive diagrams you can embed anywhere.
See pricing
SankeySuite
The MFA engine: data reconciliation under constraints, uncertainty propagation, completion from as little as 10% of measured data. Excel in, balanced flows out.
See pricingFrom raw data to story, on autopilot
The MFA · reconciliation · Sankey triptych: watch the full pipeline unfold, from raw data to a published diagram.
Coming from another tool?
Your existing work opens directly, with no retyping.
We did not set out to replace these tools so much as to gather what each of them does best: the immediacy of SankeyMATIC, the scientific rigour STAN brought to material flow analysis, and the industrial polish of e!Sankey. Then we added the two things none of them offer: disaggregating a node into its sub-flows and folding it back again, and computing intervals rather than single values when the data is uncertain.
From STAN
Open your .smfa files directly. STAN hasn't shipped a release since 2022,
your models deserve a maintained home.
From SankeyMATIC
Paste your source [value] target text as-is, including colors and layout
settings. Then make it interactive.
From e!Sankey
Browser-based, transparent public pricing, and an actual reconciliation engine: not just balance checks.
OpenSankey vs e!Sankey →Built on real studies, not demos
Fifteen years of cumulated experience mapping agriculture, forestry, waste, biomass and energy flows for public agencies and industry.
They trust us
National agencies, research institutes, technical institutes and local authorities.
The method, in video
Why material flow analysis and Sankey diagrams help steer sustainable supply chains: explained on the wood value chain.
Who we are
TerriFlux is a deep-tech worker cooperative (SCOP) spun off from Inria, the French national institute for computer science. Our reconciliation engine comes from peer-reviewed research on territorial metabolism. We work with ADEME, INRAE, IGN and regional agencies, and everything we build ships in the open: the editor is open source.
Nine R&D projects since 2022 (with ADEME, INRAE, CNRS and Bpifrance) and open-access publications back everything we ship. Discover our research →