Process simulation software
Simulate and optimise entire flowsheets, right in your browser.
Open a flowsheet, model it with colleagues in real time, and let the equation-oriented solver optimise for the KPIs you care about — no install, no node-locked licence, at a fraction of the cost of Aspen, gPROMS or AVEVA.
Why Fugasity
Everything a modern process simulator should be.
01
Web-native, nothing to install
The whole simulator runs in the browser. No desktop install, no IT tickets, no node-locked licence. Open a flowsheet from any machine and you are always on the latest version.
02
Edit together, in real time
Multiple engineers work on the same flowsheet at once — cursors, selections and results update live. Review a model together instead of emailing files back and forth.
03
Version control, built in
Every flowsheet is stored as plain JSON. Changes are tracked automatically and shared across your organisation, so teams branch, compare and roll back without merge conflicts.
04
Equation-oriented solver
A simultaneous, white-box solver — every equation is visible and editable. Purpose-built for flowsheet-wide optimisation, not sequential-modular guesswork.
05
Optimise for the KPIs you care about
Set objectives — energy, yield, cost, emissions — and let the solver find the operating point. Bayesian optimisation and parameter sweeps are part of the tool, not an add-on.
See your own model run in the browser.
Workspace
One shared canvas for your whole team.
Incumbents like Aspen and gPROMS lock a simulation to one desktop, one file and one engineer. Fugasity puts the flowsheet in a shared workspace — draw standards-compliant P&IDs, wire up unit operations, and watch the equation-oriented solver converge, all in the browser.
Version history
Raised reflux ratio to 3.2
Priya · just now
Added T-101 side reboiler
You · 4m ago
Fixed feed composition
Marcus · 1h ago
Initial C3 splitter
Priya · yesterday
In this workspace
Positioning
Where Fugasity fits.
Process modelling today mostly happens in a handful of desktop incumbents — Aspen, gPROMS, UniSim and AVEVA. Here is how Fugasity compares on what teams actually feel day to day.
| Aspen · gPROMS · AVEVA | Fugasity | |
|---|---|---|
| Deployment | Desktop install, per-machine setup and updates | Runs in the browser — nothing to install, always current |
| Collaboration | One engineer, one file, one machine at a time | Real-time multi-user editing on a shared flowsheet |
| Version control | Manual file copies (model_v3_final.bkp) | Automatic history and org-wide sharing, JSON under the hood |
| Solver | Sequential-modular, closed black-box units | Equation-oriented and white-box — every equation exposed |
| Optimisation | Requires add-ons or external scripting | Multi-objective optimisation built in |
| Cost per seat | Tens of thousands of pounds per year | Around a tenth of the incumbent licence |
Applications
One simulator, across the process industries.
We start where we have the deepest expertise — adsorption and gas separation — and spiral out one industry at a time, reusing the same solver, symbols and workspace.
Gas separation & adsorption
PSA, VSA and TSA cycles for carbon capture, hydrogen purification and air separation — the niche we know best.
Oil, gas & petrochemicals
Distillation trains, gas processing and separation networks modelled and optimised end to end.
Chemicals & fine chemicals
Reactor-separation flowsheets with recycles, solved simultaneously for tighter energy and yield targets.
Clean energy & carbon
Direct air capture, electrolysis balance-of-plant and CO₂ conditioning with full thermal modelling.
Water & environmental
Treatment and recovery processes where mass and energy balances have to close across the whole plant.
Food, pharma & specialty
Batch and continuous unit operations where reproducibility and validated physics matter most.
Design partners
We'll rebuild your model — and validate it for free.
Validation, not price, is the real gate. So we do it up front. Send us a case you already trust — experimental or simulated — and we will reproduce it in Fugasity and show you how closely it matches, before you commit to anything.
We work as an embedded design partner: sitting with your engineers, building the features your workflow needs, with one promise — to cut your simulation software costs by roughly 10×.
01
Send us a case
A model or dataset you already know the answer to.
02
We reproduce it
We rebuild it in Fugasity and compare against your results.
03
You see the match
Open it, run it, and check it against the paper or plant data.
04
We build together
We shape the software around your exact workflow as a design partner.
Get started
Cut your simulation software costs by 10×.
We are onboarding a small number of design partners. If your team pays for process simulation today and wants to model faster, together, and for far less — we should talk.