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.


Connect your PSP to your computer via USB or insert the Memory Stick into a card reader. Navigate to the PSP/SAVEDATA folder on your Memory Stick. Copy the unzipped save folder into this directory. Disconnect and boot the game. Important Compatibility Note: Game Regions
Once you have everything unlocked, the real fun begins. You can dive into with a friend (or AI) to test out high-level combos or use the Mission Master mode to replay iconic boss fights like Naruto vs. Pain or Sasuke vs. Itachi with maximum power.
If your save isn't showing up, check if your game's ID matches the folder name of the save data you downloaded. You can rename the folder to match your game ID, but this doesn't always work if the internal files are coded differently. What to Do After Loading the Save?
All "Tag Missions" and "Extra Missions" completed with an S-rank. Where to Find the Best Save Data
No setup or downloads — just instant access right in your browser.
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.
No install. No login. No cloud required.
Connect your PSP to your computer via USB or insert the Memory Stick into a card reader. Navigate to the PSP/SAVEDATA folder on your Memory Stick. Copy the unzipped save folder into this directory. Disconnect and boot the game. Important Compatibility Note: Game Regions
Once you have everything unlocked, the real fun begins. You can dive into with a friend (or AI) to test out high-level combos or use the Mission Master mode to replay iconic boss fights like Naruto vs. Pain or Sasuke vs. Itachi with maximum power.
If your save isn't showing up, check if your game's ID matches the folder name of the save data you downloaded. You can rename the folder to match your game ID, but this doesn't always work if the internal files are coded differently. What to Do After Loading the Save?
All "Tag Missions" and "Extra Missions" completed with an S-rank. Where to Find the Best Save Data
Simple, quick, and useful right out of the gate — designed to open-and-go.
Launch epanet-js now