epanet-js

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No installs. No forced cloud storage. Just fast, local-first water modeling — powered by the engine you already trust.

Launch epanet-js. No login needed.Book a demo

The EPANET user's dilemma

  • Classic EPANET is powerful — but clunky and outdated. Workarounds become your workflow — slow and cumbersome.
  • Big-name platforms look polished, but they're overpriced and bloated with features you don't need to analyze your network quickly.
  • Modern browser-based tools exist — but they force your data into the cloud, raising privacy and compliance concerns. Plus, they offer little for those doing long-term planning and analysis.

You shouldn't have to choose between speed, security, and affordability just to understand your water networks.

Old EPANET UI
Complex Modeling App

: The individual is initially rejected or treated poorly based on their perceived financial status or appearance.

A high-end luxury vehicle or a display of significant wealth is introduced, causing a sudden shift in the lead's attitude.

👇 Vote in the poll: Was this a legendary bit or did she embarrass the entire OnlyTarts guild? 🛑 Spoiler ban for 24 hours. Do not tell the Tarts Council how it ends. 💰 Flair: Use GOLD_DIGGER_24 to react.

🔥 The vault for the 24 06 28 era has been cracked, and what we found is pure chaos.

Performing Hypergamy for Profit: Deconstructing the “Era Queen Gold Digger Prank” on OnlyTarts

Shortly after the release, anonymous Twitter accounts claimed the man in the video had lawyered up, alleging emotional distress and unauthorized commercial use of his likeness. Era Queen’s OnlyTarts page briefly went private on July 2, 2024, before returning with a new banner: “No lawsuits, just luxury. Stream the uncut Gold Digger Prank now.” No official legal filing has been confirmed.

Model water networks instantly.

No setup or downloads — just instant access right in your browser.

Start modeling now

EPANET deserves better — and so do you.

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.

EPA logo
Source code of epanet-js on GitHub

When you support epanet-js, you support EPANET.

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.

Simple, transparent pricing for every kind of modeler.

Choose the plan that works for you

Free

For everyone.$0 /year
  • Web based EPANET model
  • Background maps and satellite
  • Automated Elevations
  • No limits on sizes
  • Community Support
Launch epanet-js now

ProMost popular

For solo modelers and small utilities.$950 /year

Individual named license

Everything in free, and:
  • Scenarios
  • Professional support
  • Custom layers
Coming soon:
  • Cloud storage
  • Point in time restore - 30 days
  • Demand Analysis
Get Pro

Teams

For teams that build together.$2500 /year

Floating shared license

Everything in Pro, and:
  • Priority support
  • Volume discounts
  • Pay by invoice
Coming soon:
  • Team storage
  • Point in time restore - 90 days
  • Sharing of networks
Get Teams

Have questions? or book a call.

Special access for personal and educational use

Available for non-commercial projects, learning, and student work. onlytarts 24 06 28 era queen gold digger prank exclusive

Personal

$100/year

For curious minds and personal growth.

Everything in pro, but:
  • Community support only
  • Non-commercial usage
Buy personal access

Education

$0/year

Free for students and teachers.

Everything in pro, but:
  • Community support only
  • Non-commercial usage
Use your school email account

Frequently asked questions

Find answers to common questions about epanet-js.

Just open your browser and model.

No install. No login. No cloud required.

Launch epanet-js now

Onlytarts 24 06 28 Era Queen Gold Digger Prank Exclusive

: The individual is initially rejected or treated poorly based on their perceived financial status or appearance.

A high-end luxury vehicle or a display of significant wealth is introduced, causing a sudden shift in the lead's attitude.

👇 Vote in the poll: Was this a legendary bit or did she embarrass the entire OnlyTarts guild? 🛑 Spoiler ban for 24 hours. Do not tell the Tarts Council how it ends. 💰 Flair: Use GOLD_DIGGER_24 to react.

🔥 The vault for the 24 06 28 era has been cracked, and what we found is pure chaos.

Performing Hypergamy for Profit: Deconstructing the “Era Queen Gold Digger Prank” on OnlyTarts

Shortly after the release, anonymous Twitter accounts claimed the man in the video had lawyered up, alleging emotional distress and unauthorized commercial use of his likeness. Era Queen’s OnlyTarts page briefly went private on July 2, 2024, before returning with a new banner: “No lawsuits, just luxury. Stream the uncut Gold Digger Prank now.” No official legal filing has been confirmed.

A better future for water modeling.

Simple, quick, and useful right out of the gate — designed to open-and-go.

Launch epanet-js now