epanet-js

- Nineteen Years Young And... !!link!! — -shesnew- Gianna Gem

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

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  • Classic EPANET is powerful — but clunky and outdated.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

Her age allows her to take risks. She isn’t protecting a brand yet; she is building one from scratch. And there is no sight more compelling than a creator who is willing to fail spectacularly in real-time.

But it’s her smile that disarms you. It’s not practiced or performative. It’s the kind of smile that suggests she’s in on a secret, and if you’re lucky, she might just let you in. She stands at that perfect crossroads of athletic and graceful—toned from years of dance or maybe soccer under Friday night lights—yet moves with a fluid, unstudied elegance that turns a simple walk across a room into a scene from a coming-of-age film.

As Gianna Gem continues to make waves in the music industry, she is not afraid to speak her mind and stand up for what she believes in. A strong advocate for women's rights, mental health awareness, and LGBTQ+ rights, Gianna Gem uses her platform to raise awareness about social issues that matter to her. Her music is a reflection of her values and passions, and she is unapologetic about expressing herself, even if it means going against the norm.

For those who discover her now, in these early moments, there will be a sense of pride later. The kind where you say, "I saw her first. I knew, right then, she was something special."

Model water networks instantly.

No setup or downloads — just instant access right in your browser.

Start modeling now

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.

EPA logo
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:

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

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.

Personal

$100/year

For curious minds and personal growth.

Everything in pro, but:
  • Community support only
  • Non-commercial usage

Education

$0/year

Free for students and teachers.

Everything in pro, but:
  • Community support only
  • Non-commercial usage

Frequently asked questions

Find answers to common questions about epanet-js.

Just open your browser and model.

No install. No login. No cloud required.

Launch epanet-js now

- Nineteen Years Young And... !!link!! — -shesnew- Gianna Gem

Her age allows her to take risks. She isn’t protecting a brand yet; she is building one from scratch. And there is no sight more compelling than a creator who is willing to fail spectacularly in real-time.

But it’s her smile that disarms you. It’s not practiced or performative. It’s the kind of smile that suggests she’s in on a secret, and if you’re lucky, she might just let you in. She stands at that perfect crossroads of athletic and graceful—toned from years of dance or maybe soccer under Friday night lights—yet moves with a fluid, unstudied elegance that turns a simple walk across a room into a scene from a coming-of-age film. -ShesNew- Gianna Gem - Nineteen Years Young And...

As Gianna Gem continues to make waves in the music industry, she is not afraid to speak her mind and stand up for what she believes in. A strong advocate for women's rights, mental health awareness, and LGBTQ+ rights, Gianna Gem uses her platform to raise awareness about social issues that matter to her. Her music is a reflection of her values and passions, and she is unapologetic about expressing herself, even if it means going against the norm. Her age allows her to take risks

For those who discover her now, in these early moments, there will be a sense of pride later. The kind where you say, "I saw her first. I knew, right then, she was something special." But it’s her smile that disarms you

A better future for water modeling.

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

Launch epanet-js now