The best tools to get the job done for humanitarian work

Designing and improving water supply for communities that need it most deserves capable, affordable tools. epanet-js gives humanitarian teams professional modeling that runs anywhere.

Talk to us
Launch epanet-js
A rural gravity-fed water network modeled over terrain in epanet-js, with the study area marked out.

Used by humanitarian and water-access organizations

The communities that need it most deserve capable tools

Commercial modeling software can cost more than an entire project budget, which puts professional hydraulic analysis out of reach for exactly the work where it matters most. Too often the choice is between expensive licenses and going without a proper model at all.

epanet-js is built to close that gap: professional-grade modeling on the trusted EPANET engine, affordable and often free, light enough to run in the field, so your resources reach the communities you serve.

Capable tools that go where you go

Humanitarian water work rarely happens in a comfortable office with a powerful workstation. epanet-js runs on modest hardware, so you can build and run real hydraulic models wherever the work takes you, on whatever operating system you have to hand.

The app loads once, then runs and saves on your machine, so any laptop and a modest connection are enough to get to results.

The EPANET you know, built for modern work

If you've worked with EPANET, you'll feel right at home. epanet-js runs the exact engine you already trust, but replaces the friction and workarounds of the legacy interface with a fast, modern workspace. You get the familiar hydraulic behavior without the tedious setup hurdles, and with fair pricing and a free tier, your budget stays focused on the project rather than software licensing.

Model and test reliable supply networks

Whether you import field survey data or sketch out lines over satellite maps, getting a layout into the model is straightforward. The software runs on the proven EPANET 2.3 engine so you can test pipe sizing, check tank levels, and confirm your design will consistently deliver water where people need it.

Open, private, and free of lock-in

epanet-js runs local-first: simulations and project files stay on your computer, never touching our servers. There is no vendor lock-in, either. You can work with standard .inp files or our open format, and our source code is public from day one (transitioning to fully open source after two years).

Handing models over to local teams or community partners is hassle-free because they'll never need an expensive license to open your work.

Professional water modeling for humanitarian work

Low cost, high impact

Affordable, with free options, so more of your funding goes to the communities you serve, not software.

Works anywhere

Browser-based and lightweight. Run it on modest hardware in the field, on any operating system.

Fast to deploy

No installs or IT infrastructure. Open a browser and start modeling to get to results quickly.

Capable, professional tools

The same trusted EPANET engine and modern workflows the industry relies on, not a stripped-down version.

Doing humanitarian water work?

Tell us about your project and we'd love to help you get set up.

Talk to us
Launch epanet-js

A sustainable, open future for water modeling

epanet-js exists because good water modeling shouldn't be limited by cost. It's built in the open, sustained by fair pricing rather than locked-away improvements, with the explicit goal of putting capable tools in the hands of more engineers, utilities, and teams, including those doing the hardest, least-funded work.

Workflows for humanitarian projects

The jobs epanet-js helps you get done in the field.

Model building

Turn GIS and asset data into a working model, fast

Operational modeling

See how your network responds before you make a change

Fire flow

Find available flow and capacity across your network

Frequently asked questions

The questions humanitarian and NGO teams ask most.

Is there a free or low-cost option for nonprofits?
Yes. There's a free tier to start, and affordable plans beyond it. If you're doing humanitarian water work, talk to us about your project — and see pricing for the options.
What hardware does it need?
Very little. epanet-js needs nothing but a browser and runs on modest hardware — a basic laptop is plenty — on Mac, Windows, or Linux. There's nothing to install.
Does it need a fast, constant internet connection?
No. The app loads once, then everything runs and saves on your machine, so you can disconnect from the internet and keep working. You don't need a powerful workstation or a heavy, always-on connection to build and run a model.
Is it the full engine or a cut-down version?
The full one. epanet-js runs the EPANET 2.3 engine and works with standard .inp files — the same professional tooling used on commercial projects, not a simplified edition.
Can field staff use it without IT support?
Yes. With nothing to install and no license server to manage, anyone on the team can open a browser and start modeling, wherever they are.
Who owns the models and data?
You do. Your projects are created, run, and saved entirely on your machine, and nothing is ever uploaded to our servers. The tool is open and works with standard formats, so your models are never locked into one vendor's format. See security for the full picture.

Let's get your project set up

Tell us about your humanitarian water work and we'd love to help, or launch epanet-js free and start right now.

Talk to us
Launch epanet-js