Power system studies now take 90 seconds.
Load flow · short circuit · NEC sizing · arc flash · in your browser
One diagram. Every study.
01 · Build
Draw the one-line.
Drag, drop, connect. Add device data from built-in libraries or paste from a spreadsheet. No training course required.
- Drag-and-drop diagram builder
- Built-in device libraries
- Excel/CSV import
02 · Load flow
Results in seconds.
Load flow runs on every change. Voltages and currents appear on the diagram while you build it.
- Bus voltages, branch flows, and system losses
- Voltage drop analysis across your entire system
- What-if scenarios to compare loading across different configurations
03 · Short circuit
Fault duty at every bus.
Every bus is faulted and every device is checked against the current it would have to interrupt.
- Three-phase fault current at every bus, per IEC 60909
- Initial symmetrical and peak current at each bus
- Automatic duty checks against device ratings
04 · Auto-sizing
Sized to NEC, automatically.
Change a motor and the cable and breaker feeding it resize with it.
- Cable, breaker, and transformer sizing per NEC
- Sizes update live as you change the model
- Override any auto-sized value when engineering judgment says so
05 · Deliver
Export and deliver.
Review flagged issues, export one-line diagrams, and generate reports. One click.
- PDF one-line diagrams
- Professional study reports
- One-click export
You already know the problem
Desktop study tools were designed in the 90s and it shows. ekx is what they'd look like if someone started over today.
No dongles. No installs. No crashes.
No installs, no dongles
Open a browser. Start working. No license servers, no IT tickets, no waiting for a dongle to ship. Your laptop is enough.
Results in seconds, not minutes
Load flow updates as you build the model, and short circuit runs in one click. Change a motor HP and watch cable sizes adjust automatically per National Electrical Code.
Every study on one diagram
Load flow, short circuit, NEC sizing, arc flash, protection curves, and harmonics all work from the one-line you draw. No model to export between tools.
You've been putting up with this
Desktop study tools
- Dongles, license servers, and IT tickets just to open the app
- Recalcs that take long enough for a coffee break
- Crashes that lose your unsaved work
- Licenses at $3,000–9,000 a year
- Features you'll never use cluttering the interface
ekx
- Open a browser tab and start
- Load flow updates as you type; short circuit is one click
- Cloud-saved — your work is always there
- Start free, pay a fraction of desktop pricing
- Quick prototyping and sizing
Start free. No credit card.
Build a project and run your first study in minutes. Upgrade when you need more. Prices in US dollars.
Free
Get started with ekx
- 1 project
- Up to 2 buses
- Short circuit & load flow
- Auto equipment sizing
- Protection curves & harmonics
- Community support
Starter
For independent consultants
- 5 projects
- Up to 50 buses per project
- Everything in Free
- PDF & report exports
- Email support
Professional
For engineers and growing teams
- Unlimited projects
- Unlimited buses
- All Starter features, plus:
- Arc flash studies & labels (IEEE 1584-2018)
- Shared project library
- Team member management
- Centralized billing
- Audit log & activity history
- Priority support
Questions you probably have
Can this actually replace my desktop tool?
For load flow, short circuit, NEC equipment sizing, arc flash, protection device curves, and harmonic design checks, often yes. We don't do transient stability or full protection coordination studies. Arc flash doesn't yet cover systems with more than one independent source or buses a 50 hp or larger motor can feed; those buses are reported as unavailable, with the reason, instead of getting a number.
What standards and methods does it use?
Short circuit uses PandaPower's IEC 60909 calculation for three-phase faults, starting from a pre-fault voltage you choose: a fixed percent of nominal (100% by default) or the IEC voltage factor of 1.10. Automated regression tests check it against PandaPower expected-result fixtures for representative commercial and industrial systems. Load flow uses Newton-Raphson. Arc flash follows IEEE 1584-2018. Equipment sizing follows NEC 2026, or CEC 2024 if you choose it for a project. Harmonic checks compare against IEEE 519-2022 design limits. Full method documentation is in our docs.
Will it work on my locked-down company laptop?
No admin rights or installs needed — it runs entirely in the browser. The only thing that could stop you is a corporate firewall blocking the site. If your network allows general web access, you're good.
Who owns the data?
You do. Export your models, diagrams, and reports anytime. Your projects are private by default. All data is encrypted at rest and in transit.
Is this just a one-line drawing tool?
No. The diagram is the model. When you place a transformer and connect it, ekx knows its impedance, ratings, and where it sits in the system. The one-line isn't a picture — it's a live electrical model.
Power system studies, in your browser.
Build the one-line, get short circuit, load flow, and arc flash results, and auto-size your equipment. Takes minutes, not days.