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.


The animation in “Song of the Sea” is breathtakingly beautiful, with a unique visual style that blends traditional and computer-generated techniques. The film’s use of watercolor-inspired backgrounds and hand-drawn characters creates a dreamlike atmosphere, perfectly capturing the sense of wonder and enchantment that pervades the story.
“Song of the Sea” is deeply rooted in Irish mythology and folklore, drawing inspiration from the country’s rich cultural heritage. The film features a range of mythical creatures, including selkies, merrows, and púcas, which are woven seamlessly into the narrative. The story also explores the themes of identity, community, and the power of storytelling, which are central to Irish folklore. song of the sea 2014
“Song of the Sea” is a film that has something to offer audiences of all ages. For children, it’s a magical and imaginative tale that celebrates the power of storytelling and the importance of family. For adults, it’s a poignant and thought-provoking exploration of grief, identity, and the complexities of human relationships. The animation in “Song of the Sea” is
The film has been praised for its nuanced and sensitive portrayal of complex themes, including grief, loss, and mental health. The characters are multidimensional and relatable, with flaws and imperfections that make them feel authentic and human. The film features a range of mythical creatures,
“Song of the Sea” received widespread critical acclaim upon its release, with many praising its stunning animation, engaging storyline, and memorable characters. The film holds a 94% approval rating on Rotten Tomatoes, with many critics hailing it as a masterpiece of animation.
Released in 2014, “Song of the Sea” is a critically acclaimed animated fantasy film written and directed by Tomm Moore and co-directed by Nora Twomey. Produced by Cartoon Saloon, a renowned Irish animation studio, the film has captivated audiences worldwide with its enchanting story, stunning visuals, and memorable characters. Set in 20th-century Ireland, “Song of the Sea” is a poignant and imaginative tale that explores the country’s rich mythological heritage, the power of storytelling, and the magic of childhood.
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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
Floating shared license
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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.
You may not know this, but for decades, the U.S. EPA has given the water industry an extraordinary gift: the free and open-source hydraulic modeling software EPANET. Odds are, if you've used any commercial hydraulic modeling software today, it was built on the EPANET engine.
The problem is, instead of giving back to their open-source roots like other industries do, big-name software vendors took EPANET's open code, built private tools on top of the engine, and then locked those improvements behind patents and proprietary licenses.
Some vendors even pressured the EPA to focus only on the engine — discouraging any effort to improve the interface or user experience for everyone else.
Those vendors now charge you exorbitant prices to use their software while EPANET lags behind — and utilities, engineers, and educators with smaller budgets suffer.
We think this is backwards — and we're on a mission to change it. We're focused on creating a better experience for the entire hydraulic modeling community.
That's why we built epanet-js under an FSL license — because we want to give you an affordable, easy-to-use water modeling option that creates a sustainable future for open-source EPANET development.
Support EPANET by using software that supports it back.
Simple, quick, and useful right out of the gate — designed to open-and-go.
Launch epanet-js now