epanet-js
No installs. No forced cloud storage. Just fast, local-first water modeling — powered by the engine you already trust.
You shouldn't have to choose between speed, security, and affordability just to understand your water networks.


In Castigo , she is assigned a rookie partner against her will, and the dynamic is both tense and touching. She is relentlessly moral, but her morality is shattering under the weight of what she has seen. When she finally corners The Corrector, the dialogue between them is the best writing Chaparro has ever produced—a philosophical duel between a woman who upholds the law and a man who believes the law is a lie.
Given that Chaparro is a journalist, the novel features brilliant subplots about how the media covers serial killers. The Corrector learns to manipulate news cycles, releasing videos to gain public sympathy. This mirrors real-world true crime obsessions and asks uncomfortable questions about whether we, the audience, are complicit in glorifying punishment.
No setup or downloads — just instant access right in your browser.
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.

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.
Choose the plan that works for you
Individual named license
Base cost
User
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Available for non-commercial projects, learning, and student work.
For curious minds and personal growth.
Free for students and teachers.
Find answers to common questions about epanet-js.
No install. No login. No cloud required.
In Castigo , she is assigned a rookie partner against her will, and the dynamic is both tense and touching. She is relentlessly moral, but her morality is shattering under the weight of what she has seen. When she finally corners The Corrector, the dialogue between them is the best writing Chaparro has ever produced—a philosophical duel between a woman who upholds the law and a man who believes the law is a lie.
Given that Chaparro is a journalist, the novel features brilliant subplots about how the media covers serial killers. The Corrector learns to manipulate news cycles, releasing videos to gain public sympathy. This mirrors real-world true crime obsessions and asks uncomfortable questions about whether we, the audience, are complicit in glorifying punishment.
Simple, quick, and useful right out of the gate — designed to open-and-go.
Launch epanet-js now