epanet-js

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No installs. No forced cloud storage. Just fast, local-first water modeling — powered by the engine you already trust.

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The EPANET user's dilemma

Classic EPANET is powerful — but clunky and outdated. Workarounds become your workflow — slow and cumbersome.
Big-name platforms look polished, but they're overpriced and bloated with features you don't need to analyze your network quickly.
Modern browser-based tools exist — but they force your data into the cloud, raising privacy and compliance concerns. Plus, they offer little for those doing long-term planning and analysis.

You shouldn't have to choose between speed, security, and affordability just to understand your water networks.

Old EPANET UI

Complex Modeling App

Learning to go with the flow of life rather than rigidly resisting change. Crafting the Entertainment Landscape

Spending the first hour of the day completely disconnected from digital screens, opting instead for manual espresso brewing and physical reading.

Embracing this lifestyle means committing to daily care that respects both the equine nature of the animal and the practicalities of modern living. Housing and Space Requirements

To live the "Man Mini Mare" life, focus on the details that bridge the gap between the deck and the dinner table.

What is the of the space you are looking to transform?

Clothing must serve multiple purposes. Look for water-resistant, abrasion-resistant fabrics that look sharp in the city but perform well in a stable or on a boat.

EPANET deserves better — and so do you.

EPANET was a gift to the industry — free, open-source water modeling for all. But commercial vendors built on it, locked away improvements, and left the community behind.

epanet-js is our answer: a faster, simpler, affordable water modeling tool that protects your privacy and sustains the open-source future of water modeling.

We're proud to be part of the next chapter — and we're just getting started.

Source code of epanet-js on GitHub

When you support epanet-js, you support EPANET.

When you purchase more features in epanet-js, you're investing in the future of open-source EPANET development.

Our open-source model balances innovation and accessibility:

Public source code from day one.
Fully open source (MIT) after two years under our Functional Source License (FSL).

Anyone can build on our code. The two-year commercial-use delay gives us the incentive to keep pushing forward — and that fuels progress for everyone.

That means when you support us, you support more affordable hydraulic modeling software for the entire community.

Simple, transparent pricing for every kind of modeler.

Choose the plan that works for you

Free

For everyone.$0 /year

Web based EPANET model
Background maps and satellite
Automated Elevations
No limits on sizes
Community Support

Launch epanet-js now

ProMost popular

For solo modelers and small utilities.$950 /year

Individual named license

Everything in free, and:

Scenarios
Professional support
Custom layers

Coming soon:

Cloud storage
Point in time restore - 30 days
Demand Analysis

Teams

For teams that build together.$2500 /year

Floating shared license

Everything in Pro, and:

Priority support
Volume discounts
Pay by invoice

Coming soon:

Team storage
Point in time restore - 90 days
Sharing of networks

Have questions? or book a call.

Special access for personal and educational use

Available for non-commercial projects, learning, and student work. Man Fuck Mini Mare

Personal

$100/year

For curious minds and personal growth.

Everything in pro, but:

Community support only
Non-commercial usage

Buy personal access

Education

$0/year

Free for students and teachers.

Everything in pro, but:

Community support only
Non-commercial usage

Use your school email account

Frequently asked questions

Find answers to common questions about epanet-js.

Man Fuck Mini Mare Exclusive

Learning to go with the flow of life rather than rigidly resisting change. Crafting the Entertainment Landscape

Spending the first hour of the day completely disconnected from digital screens, opting instead for manual espresso brewing and physical reading.

Embracing this lifestyle means committing to daily care that respects both the equine nature of the animal and the practicalities of modern living. Housing and Space Requirements

To live the "Man Mini Mare" life, focus on the details that bridge the gap between the deck and the dinner table.

What is the of the space you are looking to transform?

Clothing must serve multiple purposes. Look for water-resistant, abrasion-resistant fabrics that look sharp in the city but perform well in a stable or on a boat.

A better future for water modeling.

Simple, quick, and useful right out of the gate — designed to open-and-go.

Launch epanet-js now