Describe the process. Claude plans it. You build it.
Type what you want, the way you would brief a colleague. Anthropic’s Claude plans every stream and unit and shows you the plan; press Build and it is drawn, connected and solved, with every number from the simulator’s own solver. Or draw it yourself: rigorous columns, five reactor models, equation-of-state and activity-model thermodynamics, live worksheets, and it opens your Aspen HYSYS, DWSIM and COCO cases.
COCOcases it opens and checks
From one paragraph to a solved plant
In the video above, one paragraph describing a gas conditioning plant became a plan of five units and nine streams, with a recycle closing the loop through the gas/gas exchanger. One press of Build drew, connected and solved it in 10.3 s.
Describe it, read the plan
Before anything is built: a summary, the assumptions Claude made, the fluid package, and every stream and unit.
Press Build
Drawn, connected and solved as one undo step, every unit OK: 9,478 kg/h of NGL at −20 °C.
Change it in plain words
“Lower the chiller outlet to −30 C”: one unit and the loop’s estimate change, and the NGL rises to 12,537 kg/h.
- Nothing changes on the flowsheet until you press Build
- Every number comes from the simulator’s own solver, never from the AI
- One Ctrl+Z takes a whole Build back
- Columns, reactors, recycles, controllers and sub-flowsheet blocks
- Your own Anthropic API key: about 5 to 12 US cents to plan and build a flowsheet of five to ten units, in our tests
- Every request and plan is kept in the case’s build history
From an empty sheet to a solved gas chiller in two minutes
No scripting and no input file. You place equipment from the palette, drop streams onto the ports, and type the specifications into each unit’s own view. The flowsheet solves as the last value goes in.
- Streams snap to unit ports and follow when you move them
- Every unit solves as soon as it has what it needs, in the right order
- A stream table drops onto the drawing and stays live
Captioned, no sound needed. 2 min 18 s.
Everything a steady-state study needs, in one desktop application
Mass and energy balances, phase equilibrium, column design, reactor chemistry and the documents that come out of them: the heat and material balance, the datasheets and the drawing.
Build with AI
Describe a process in plain words. Claude plans the flowsheet, you press Build, and the solver computes every number.
Build with AI →
Build a flowsheet
A drag-and-drop PFD canvas, automatic solve order, recycles, Adjust and Spec controllers, and sub-flowsheets nested to any depth.
Flowsheets →
Unit operations
Rigorous columns, absorbers and strippers, Gibbs, equilibrium, conversion, PFR and CSTR reactors, exchangers, pumps, compressors, pipes and relief networks.
All 34 blocks →
Thermodynamics
Peng-Robinson, PRSV, SRK, PR-Twu, SRK-Twu and Twu-Sim-Tassone; Sour PR and Sour SRK for sour water; a Glycol Package; Chao-Seader and Grayson-Streed; Kent-Eisenberg for amines; NRTL, UNIQUAC, Wilson, Margules, van Laar and Chien-Null; UNIFAC; editable interaction parameters, phase diagrams and crude-oil assay characterization.
Property packages →
Worksheets and Excel
An Excel-style worksheet whose cells stay linked to the model, equipment datasheets, and one-click export to Excel and PDF.
Worksheets →
Open other simulators’ cases
Import Aspen HYSYS, DWSIM and COCO/COFE cases, then compare every stream against the source simulator’s own results.
Imports →
Sub-flowsheets
Fold a section of plant into one block, give it its own fluid package, and reach inside it from the main sheet.
Sub-flowsheets →
AI convergence advisor
When a column will not converge, ask Anthropic’s Claude why. It reads the solver’s evidence and can run test solves on a private copy.
AI advisor →
Checked, and says how
1,975 documented checks against hand calculations, published data and other simulators, readable inside the app.
Validation →Then watch it move through time
Switch a solved case to Dynamics and run it: vessels fill and drain, valves pass what the pressures on either side push through them, and PID controllers hold levels, pressures and temperatures, with strip charts and face plates to watch them. DWSIM’s own dynamic cases import with their recorded runs, drawn beside the app’s.
Dynamics has been in the free download since version 2.0.0, with cascade, ratio, split-range and on-off control beside the PID controller.
Relief and flare networks, in the same program
Type the pressure at the flare tip, and every relief valve gets the back pressure the network builds up, on the case’s own fluid package. Pipes give their Mach number and ρv² against limits, tees and fittings take their losses, and a pipe too narrow says it is choked.
Six steps, the way you would do it on paper
A natural-gas chiller, start to finish. Each picture is a frame from the gas chiller video above.
Place the equipment
Pick units from the Equipment Palette and drop them on the canvas.
Connect the streams
Drop each stream onto a unit’s port. Move a unit and its connections follow.
Specify each unit
Here the cooler: outlet at −15 °C with a 0.5 bar pressure drop.
Describe the feed
Choose the fluid package, then enter the composition in mole or mass fractions.
It solves as you type
When the last value goes in, every unit solves in order and turns green.
Report the result
Drop a stream table on the drawing. It updates with every solve.
Rigorous where it counts, and it shows you why
Columns solve the full MESH equations. Reactors minimise Gibbs energy, hold chemical equilibrium or integrate rate laws along their length. Every unit draws the diagram behind its own answer.
A custom report sheet that stays live
The PFD Worksheet is an Excel-style grid beside the drawing. Right-click a cell, insert a stream’s conditions or a unit’s results, and the values stay linked: change the feed and the sheet updates.
- Type into a blue cell and the value writes back to the model
- Copy any block of cells and paste it straight into Excel
- Export every equipment datasheet to one Excel workbook or one PDF
Open Aspen HYSYS, DWSIM and COCO cases, then check them
Import a case and the flowsheet arrives drawn, connected and specified. Then Validate import compares every stream with the answer the other simulator stored: temperature, pressure, flow, composition and vapour fraction.
1,975 checks, sorted by how strong the evidence is
Every number in the validation report came from running the software. The report keeps hand-checkable answers, published reference data and comparisons with other simulators apart, because agreeing with another program is not the same as being right.
| Strength of evidence | Checks | Result |
|---|---|---|
| Analytic (closed-form answers, balances that must close) | 818 | PASS |
| Published reference data (NIST, IAPWS-IF97, NASA-7, …) | 171 | PASS |
| Experimental unit-operation data | — | NOT RUN |
| Third-party simulator comparison | 209 | PASS |
Release 2.1.0. The report says plainly what it does not claim, including that nothing is yet checked against measurements from real equipment.
Frequently asked
What is steady-state process simulation?
A steady-state simulator solves the mass and energy balances and the phase equilibrium of a process running at constant conditions. You describe the feeds and the equipment; it calculates every stream’s temperature, pressure, flow, composition and properties, and each unit’s duty or power. It is the tool behind heat and material balances, equipment sizing and design studies.
Will it feel familiar if I have used HYSYS, Aspen Plus or DWSIM?
Yes. You place equipment on a canvas, connect material streams, assign a fluid package and specify each block, and the solver finds the rest. The unit views, the fluid package manager and the oil manager follow the conventions process engineers already know.
Can it open my Aspen HYSYS cases?
It imports HYSYS cases saved as XML (File > Save As > HYSYS XML Cases in HYSYS) and older binary .hsc files. Newer .hsc files are encrypted and cannot be read directly; the XML route works for any case. Every import produces a report that names anything approximated or left out.
Which thermodynamic models are included?
Peng-Robinson, PRSV and Soave-Redlich-Kwong equations of state, PR-Twu and SRK-Twu, Peng-Robinson and SRK with Twu’s alpha function, and Twu-Sim-Tassone; Sour PR and Sour SRK for refinery sour water, on G. M. Wilson’s model; a Glycol Package for TEG, DEG and MEG; Chao-Seader and Grayson-Streed for refinery hydrocarbons, water always as free water; Kent and Eisenberg’s amine package for CO2 and H2S in MEA, DEA or MDEA; six activity models, NRTL, UNIQUAC, Wilson, Margules, van Laar and Chien-Null, each with an Ideal, RK, SRK or Peng-Robinson vapour; UNIFAC (the original VLE table, the liquid-liquid table and the NIST revision); Ideal; and an Incompressible package for heat-transfer fluids. Liquid densities use COSTALD by default on the equation-of-state packages.
Does it run on Mac or Linux?
It runs on Windows and on the Mac. On Windows it needs Windows 10 or 11 (64-bit) and installs for the current user without administrator rights. On a Mac it needs macOS 13 Ventura or later, on an Intel or Apple-silicon Mac. There is no Linux version.
Where does the “AI” come in?
Three places. Build with AI turns a written description into a flowsheet: Anthropic’s Claude plans it, you press Build, and the simulator’s own solver computes every number. The distillation column’s AI convergence advisor explains why a column will not converge, and can run test solves on a private copy to find out. Both use your own Anthropic API key and change nothing on their own. And the software itself was built by a chemical engineer with Claude as the development partner.
Does the AI calculate the results?
No. Every temperature, flow, duty and composition comes from the simulator’s own solver, exactly as if you had drawn and specified the flowsheet by hand. Build with AI proposes a flowsheet and the advisor proposes changes; neither does thermodynamics or computes a result.
How much does it cost?
Version 2.1.0 is free to download and use, Dynamics included. Build with AI and the AI advisor use your own Anthropic API key, and Anthropic bills that use to you: planning and building a flowsheet of five to ten units cost about 5 to 12 US cents in our tests.
Try it on your own process
Version 2.1.0 for Windows and macOS is free to download, Build with AI included, with 34 sample cases: a crude unit, distillation columns, sub-flowsheets, and DWSIM and COCO cases to import.