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 recurring chorus emphasizes that while she is still present, her mind is already made up.
The Fratellis - She's Not Gone Yet But She's Leaving (In-Studio)
The track is characterized by its energetic, retro-garage rock sound, often compared to the style of the Arctic Monkeys. Lyrically, it portrays a character caught in the middle of a transition, depicting a woman who has mentally checked out of a relationship or situation but has not yet physically departed. Key themes include:
: Lyrics such as "one part evil, three-fifths blind" suggest a flawed, multi-dimensional protagonist.
Released as a single in late 2013, the song helped re-establish the band's presence on the radio and in the indie scene.
is a standout track by the Scottish indie rock band The Fratellis , featured on their 2013 comeback album, We Need Medicine . The song marked a significant moment for the band, arriving three years after they initially disbanded in 2009. The Story Behind the Song
: The song captures the specific, often messy tension of a looming change. Music & Availability
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.
: The recurring chorus emphasizes that while she is still present, her mind is already made up.
The Fratellis - She's Not Gone Yet But She's Leaving (In-Studio)
The track is characterized by its energetic, retro-garage rock sound, often compared to the style of the Arctic Monkeys. Lyrically, it portrays a character caught in the middle of a transition, depicting a woman who has mentally checked out of a relationship or situation but has not yet physically departed. Key themes include:
: Lyrics such as "one part evil, three-fifths blind" suggest a flawed, multi-dimensional protagonist.
Released as a single in late 2013, the song helped re-establish the band's presence on the radio and in the indie scene.
is a standout track by the Scottish indie rock band The Fratellis , featured on their 2013 comeback album, We Need Medicine . The song marked a significant moment for the band, arriving three years after they initially disbanded in 2009. The Story Behind the Song
: The song captures the specific, often messy tension of a looming change. Music & Availability
Simple, quick, and useful right out of the gate — designed to open-and-go.
Launch epanet-js now