A process simulator that runs in your browser: steady-state, pressure-driven and dynamic flowsheets, rigorous thermodynamics, and an AI copilot that builds and explains them. There is nothing to install.

Does the AI calculate the results?

No. The copilot proposes a flowsheet or a change and explains it; the deterministic solver computes every temperature, duty and composition you see. A flowsheet from the copilot that does not validate is not applied.

Will it feel familiar if I have used Aspen Plus or HYSYS?

That is the intent. The workbench has a ribbon, an All Items tree, a form for each block and the three run modes — steady state, pressure driven and dynamics — so the habits carry over.

Can it open my Aspen or HYSYS cases?

Aspen Plus .bkp and .apw, HYSYS .hsc and DWSIM files import with deterministic parsing and a report of what was recovered. A HYSYS .hsc import is partial — unit names and types, not connectivity — and the report says so.

Which thermodynamic models are included?

Peng-Robinson and SRK (including Gᴱ mixing rules), NRTL, UNIQUAC, UNIFAC, PC-SAFT, CPA, GERG-2008, electrolyte NRTL, Pitzer and the IAPWS steam tables — more than 30 property packages in all.

Yes. The Python SDK (pip install flowsim-sdk) creates, runs and reads simulations, and its results are the same objects the canvas shows.

How much does it cost?

It is free to start, with no credit card. Paid plans add higher limits and team features; the pricing page has the details.

A process simulator that runs in your browser: steady-state, pressure-driven and dynamic flowsheets, rigorous thermodynamics, and an AI copilot that builds and explains them. There is nothing to install.

Does the AI calculate the results?

No. The copilot proposes a flowsheet or a change and explains it; the deterministic solver computes every temperature, duty and composition you see. A flowsheet from the copilot that does not validate is not applied.

Will it feel familiar if I have used Aspen Plus or HYSYS?

That is the intent. The workbench has a ribbon, an All Items tree, a form for each block and the three run modes — steady state, pressure driven and dynamics — so the habits carry over.

Can it open my Aspen or HYSYS cases?

Aspen Plus .bkp and .apw, HYSYS .hsc and DWSIM files import with deterministic parsing and a report of what was recovered. A HYSYS .hsc import is partial — unit names and types, not connectivity — and the report says so.

Which thermodynamic models are included?

Peng-Robinson and SRK (including Gᴱ mixing rules), NRTL, UNIQUAC, UNIFAC, PC-SAFT, CPA, GERG-2008, electrolyte NRTL, Pitzer and the IAPWS steam tables — more than 30 property packages in all.

Yes. The Python SDK (pip install flowsim-sdk) creates, runs and reads simulations, and its results are the same objects the canvas shows.

How much does it cost?

It is free to start, with no credit card. Paid plans add higher limits and team features; the pricing page has the details.

MaximaLabs vs AVEVA Process Simulation

AVEVA Process Simulation (SimCentral) broke from the classic sequential simulators with one model you can solve steady-state, pressure-driven, or dynamically, plus an equation-oriented engine. MaximaLabs covers the same three solve modes on one model — a simultaneous equation-oriented solver, reusable Fluids, and hierarchical sub-flowsheets — then adds an AI copilot, zero-install browser access, and live collaboration, without a desktop client or a per-seat license. Honest difference: our dynamic mode solves composition dynamics at fixed hydraulics over any topology, not SimCentral's full pressure-flow dynamic network.

One model, every way to solve it

The architecture that sets AVEVA Process Simulation apart from legacy sequential simulators — matched capability-for-capability, and running in your browser today.

One model, three solve modes

Steady-state, pressure-driven (Cv/Darcy resistances with pumps, compressors and turbines on real curves), and dynamic (holdup DAE) — all from the same flowsheet, toggled without re-authoring.

Equation-oriented simultaneous solver

Solve every stream unknown at once — no tearing — for tight recycle loops, alongside classic sequential-modular. The symbolic path emits exact analytic Jacobians.

Reusable Fluids & hierarchical sub-flowsheets

Define a Fluid once — composition plus property method — and reference it everywhere; collapse a subsystem into a reusable sub-flowsheet block and drill in to edit it. A project-level Fluid library shares them across models.

Progressive fidelity

Swap a column between a fast Fenske-Underwood-Gilliland shortcut and a rigorous MESH solve on the very same node — screen quickly, then refine, with no re-modeling.

Rate-based separations

Maxwell-Stefan two-film columns with published tray and packing mass-transfer correlations, a high-flux correction, and a coupled interface energy balance — for the absorption and reactive separations equilibrium stages get wrong.

Scenarios & case studies

Compare named scenarios side by side and sweep any parameter — each a full re-solve on the same model — to explore a design without forking it.

Every capability here is shipped and running in the browser today. Where a model is screening-grade rather than fully rigorous, we say so in the app — we disclose scope instead of implying databank depth we don't have.

Where MaximaLabs goes further

Same architecture — plus the things a desktop simulator can't be.

✓Runs in the browser with zero install — no desktop client, no license server. Open a URL; share a working model by link.
✓An AI copilot built in: plain-English flowsheet generation, plain-English convergence diagnostics, and design advice that reads your full simulation state.
✓Live multiplayer editing and Git-style version history — several engineers on one flowsheet, not files passed around.
✓Usage-based pricing — pay for the solves you run, instead of per-seat perpetual licenses.
✓New-energy and specialty physics breadth: electrolyzers, carbon capture, blue-hydrogen SMR, VPSA, crystallizers and solids, polymer thermodynamics — beyond a classic oil-and-gas simulator.
✓An open Python SDK and a live example gallery — script the same solver, or fork a real flowsheet in one click.

Try the headline demo

Frequently asked questions

Is MaximaLabs an alternative to AVEVA Process Simulation (SimCentral)?

AVEVA Process Simulation (SimCentral) broke from the classic sequential simulators with one model you can solve steady-state, pressure-driven, or dynamically, plus an equation-oriented engine. MaximaLabs covers the same three solve modes on one model — a simultaneous equation-oriented solver, reusable Fluids, and hierarchical sub-flowsheets — then adds an AI copilot, zero-install browser access, and live collaboration, without a desktop client or a per-seat license. Honest difference: our dynamic mode solves composition dynamics at fixed hydraulics over any topology, not SimCentral's full pressure-flow dynamic network.

Does MaximaLabs support the same solve modes as AVEVA Process Simulation?