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.

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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
Tutorials

Watch ChemForge in Action

Short narrated walkthroughs that show complete workflows from a blank browser tab to solved engineering results.

Getting Started · 2.5 min

Getting Started with ChemForge: Your First Flash

Create a new project, add components, choose Peng-Robinson thermodynamics, build a flash flowsheet, and inspect the solved stream results.

Relief Sizing · 4.5 min

Build Your First API 520 Relief Valve in ChemForge

Set up a propane relief case, define the protected equipment and scenario basis, run PSV sizing, and review the API 520 calculation details.

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

Example Flowsheets

A quick look at the working ChemForge models available in the examples gallery.

Flash

Flash Separation

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

 Separation

Distillation Column

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

 Safety

Propane Relief (API 520)

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

Ready to Simulate?

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

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