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 primary objective remains consistent: to encourage the creation of effective, reliable, and high-quality computerized systems through a cost-effective and efficient framework . The Core Principle: A Risk-Based Approach
The Good Automated Manufacturing Practice (GAMP) and International Society of Pharmaceutical Engineers (ISPE) guidelines are two widely recognized standards for ensuring the quality and reliability of computerized systems in the pharmaceutical industry. In this article, we will explore the key principles and best practices outlined in GAMP and ISPE, and provide guidance on how to implement them in your organization.
Adopting the ISPE GAMP® framework offers several strategic advantages for pharmaceutical and medical device manufacturers: gamp ispe
One of the most practical tools in GAMP is the categorization of software, which dictates how much validation is required.
Will the software affect the efficacy or purity of the drug? The primary objective remains consistent: to encourage the
Is the data accurate, complete, and protected from unauthorized changes?
(Note: Category 2 was retired in GAMP 5 as it was deemed redundant). Adopting the ISPE GAMP® framework offers several strategic
The Importance of GAMP® in the Pharmaceutical Industry - ISPE
GAMP 5 is not a regulation itself, but a methodology to achieve compliance. It focuses on two main pillars:
Here is comprehensive content regarding GAMP and ISPE, structured for a presentation, guide, or internal training document.
Full System Development Life Cycle (SDLC) documentation and rigorous testing. Key Benefits of Implementing GAMP®
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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.
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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.
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