Version 2.0 · Free Forever

Process Simulation.
No License Required.

ChemForge is a full-featured chemical process simulator that runs entirely in your browser. Build flowsheets, solve flash and distillation problems, run sensitivity studies — all without installing a single program or paying a license fee.

Launch Free Demo
No install required Runs 100% locally Data never leaves your machine
app.chemforge.net
ChemForge GUI — flowsheet simulation canvas

Click to open the live demo — free, no sign-up

$0
Cost to start — free forever, no credit card
15+
Unit operations ready to use out of the box
51 MB
Chemical property database, loaded locally in your browser
Why ChemForge

Built for Engineers, Not IT Departments

Everything you need to model a process — none of the overhead of enterprise licensing, annual renewals, or IT approval tickets.

Runs In Your Browser

No installer, no .NET runtime, no IT ticket. Open a URL and you're simulating. ChemForge uses WebAssembly to run all thermodynamic calculations locally — no cloud, no latency, no data exposure.

Your Data Stays Private

Every calculation happens on your machine. Your process data, flowsheet designs, and chemical compositions are never uploaded to a server. Work on sensitive projects with full confidence.

Transparent Engineering

Full visibility into the thermodynamics and unit operations — no black-box vendor lock-in. Every correlation, every assumption, documented.

Steady-State Simulation

Solve full flowsheets: flash separations, rigorous distillation columns, pump curves, controller tuning. Dynamic / transient analysis is on the roadmap.

Sensitivity Studies

Sweep any parameter across any unit operation and plot the effect automatically. Understand how feed temperature, pressure, or composition changes propagate through your entire flowsheet.

Custom SVG Symbols

Design your own P&ID symbols with the built-in SVG editor. ChemForge uses standard engineering symbols out of the box, and lets you create custom ones for your specific equipment.

Unit Operations

Everything in the Toolbox

ChemForge ships with a complete library of unit operations for steady-state process simulation. Dynamic / transient capability is on the roadmap.

Flash Drum (VLE)
Distillation Column
Heat Exchanger
Pump
Pipe & Fittings
Mixer
Splitter
Tank (Dynamic)
Stoichiometric Reactor
Component Separator
Sensitivity Study
Controller
TPxy Phase Diagram
Graph Display
Inlet / Outlet
P&ID Symbols
Examples

Runnable Flowsheets, One Click Away

Every example below is a complete, working ChemForge model. Open one in your browser, change the inputs, and watch the simulation re-solve.

Separation

Distillation Column

Continuous binary distillation with reflux, condenser, and reboiler — the classic teaching flowsheet.

 Flash

Flash Separation

Single-stage flash drum splitting a multi-component feed into vapor and liquid products.

 Convergence

Recycle Loop

Closed material recycle with Wegstein acceleration. Demonstrates the tear-and-converge solver.

 Reaction

Steam Methane Reforming

Hydrogen production via SMR + water-gas shift. Equilibrium reactor with full heat balance.

 VLE

Isopropanol–Water VLE

Minimum-boiling azeotrope at ≈87 mol% IPA. The canonical NRTL teaching example.

 Safety

Propane Relief (API 520)

Pressure-relief sizing for a propane vessel — combination PSV + rupture disc per API 520/521.
See all examples →
Getting Started

From Zero to Simulation in 60 Seconds

No setup wizard. No license activation. No training course required before your first run.

1

Open Your Browser

Navigate to app.chemforge.net. No download, no install, no account.

2

Build Your Flowsheet

Drag unit operations onto the canvas, connect streams, configure temperatures, pressures, and compositions in plain engineering units.

3

Run and Analyze

Hit Run. ChemForge solves your flowsheet, displays stream properties, generates plots, and lets you sweep parameters in a sensitivity study.

Comparison

The Right Tool for Most Engineers

ChemForge covers the steady-state workflows that SMEs, startups, and academics actually use day to day. Dynamic / transient on the roadmap.

Feature ChemForge Aspen Plus / HYSYS ChemCAD
License cost Free (Community) $25,000–$55,000 / yr $5,000–$15,000 / yr
Installation required ✓ Browser only ✗ Windows installer ✗ Windows installer
Runs offline / 100% locally ✓ ~ Requires license server ~ Requires license server
Data privacy (no cloud upload) ✓ ~ Depends on deployment ~ Depends on deployment
Source available ✓ ✗ ✗
Steady-state simulation ✓ ✓ ✓
Rigorous distillation (VLE) ✓ ✓ ✓
Sensitivity / parameter sweep ✓ ✓ ✓
Specialty modules (amines, HF, etc.) ✗ Not yet ✓ ~ Add-ons available

Aspen and ChemCAD are trademarks of their respective owners. Pricing estimates based on publicly available information as of 2026.

Ready to Simulate?

Open ChemForge in your browser right now — no sign-up, no install, no waiting.

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