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.


Together, they formed an unlikely alliance, determined to protect the timestream from those who would seek to exploit its power. Along the way, they encountered formidable foes, including the sinister Doctor Octopus and the enigmatic Morlun.
The younger Spider-Man, fueled by curiosity and a sense of responsibility, accepted the challenge. With his trusty web shooters at the ready, he embarked on a journey through time and space.
His first stop was the ancient Egypt of the pharaohs. There, he encountered a powerful artifact known as the "Chrono-Crystal," which had the ability to manipulate time itself. But, to his surprise, he wasn't alone. A rival Spider-Man from a parallel universe, known as "The Shadow Spider," was also after the crystal.
As the stakes grew higher, the Spider-Men discovered that the mastermind behind the timestream's unraveling was none other than a future version of Alistair Smythe, the son of Spider-Man's nemesis, Spencer Smythe. This future Smythe had created a technology that allowed him to traverse the timestream, seeking to reshape reality in his own image.
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
Have questions? or book a call.
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.
Together, they formed an unlikely alliance, determined to protect the timestream from those who would seek to exploit its power. Along the way, they encountered formidable foes, including the sinister Doctor Octopus and the enigmatic Morlun.
The younger Spider-Man, fueled by curiosity and a sense of responsibility, accepted the challenge. With his trusty web shooters at the ready, he embarked on a journey through time and space.
His first stop was the ancient Egypt of the pharaohs. There, he encountered a powerful artifact known as the "Chrono-Crystal," which had the ability to manipulate time itself. But, to his surprise, he wasn't alone. A rival Spider-Man from a parallel universe, known as "The Shadow Spider," was also after the crystal.
As the stakes grew higher, the Spider-Men discovered that the mastermind behind the timestream's unraveling was none other than a future version of Alistair Smythe, the son of Spider-Man's nemesis, Spencer Smythe. This future Smythe had created a technology that allowed him to traverse the timestream, seeking to reshape reality in his own image.
Simple, quick, and useful right out of the gate — designed to open-and-go.
Launch epanet-js now