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.


: Includes Optical Character Recognition to extract and read text from PDF files where standard text extraction fails.
: Reads various formats including PDF, EPUB, DOCX, RTF, and HTML.
: Upgrading to the premium license removes all in-app banner ads and full-screen ads that typically appear when loading new articles.
: Enables continuous recording of entire reading lists or ebooks into sound files (WAV or OGG). In contrast, the free version stops recording after each individual article or chapter.
The (specifically version 26.7.1 ) includes a suite of advanced text-to-speech features designed to provide a more seamless, ad-free listening experience. Key Premium Features
: Highlights the current sentence and word being read to help with focus and concentration.
: Premium users can integrate their own API keys from Google Cloud , Microsoft Azure, or Amazon Polly to use high-quality AI-driven voices. Core Functionality (Included in Version 26.7.1)
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.
: Includes Optical Character Recognition to extract and read text from PDF files where standard text extraction fails.
: Reads various formats including PDF, EPUB, DOCX, RTF, and HTML.
: Upgrading to the premium license removes all in-app banner ads and full-screen ads that typically appear when loading new articles.
: Enables continuous recording of entire reading lists or ebooks into sound files (WAV or OGG). In contrast, the free version stops recording after each individual article or chapter.
The (specifically version 26.7.1 ) includes a suite of advanced text-to-speech features designed to provide a more seamless, ad-free listening experience. Key Premium Features
: Highlights the current sentence and word being read to help with focus and concentration.
: Premium users can integrate their own API keys from Google Cloud , Microsoft Azure, or Amazon Polly to use high-quality AI-driven voices. Core Functionality (Included in Version 26.7.1)
Simple, quick, and useful right out of the gate — designed to open-and-go.
Launch epanet-js now