Gnist – Electrical Calculator
Cable & circuit calculators
$1.99 · Designed for iPad. Not verified for macOS.
Gnist is a fast, precise calculation tool for electricians and electrical professionals - built around NEK 400 (and IEC 60364).
Size cables and overcurrent protection, calculate voltage drop, short circuit and earth-fault disconnection, check selectivity, and size heating cable, EV charger, solar/PV and motor starting - all in seconds.
CALCULATORS
- Cable & fuse - cross-section, protection, reference method, correction factors
- Voltage drop - DeltaU in percent over the cable length
- Short circuit - Ik and adiabatic check
- Earth fault & disconnection - Zs requirement for automatic disconnection
- Selectivity - indicative assessment between protective devices
- Heating cable - power and spacing by room and substrate
- EV charger, solar/PV, motor starting
- Basic calculator - Ohm's law, power, energy, PE, AWG
- Build installations as a tree, get warnings and single-/multi-line diagrams
- Save projects and export PDF
LANGUAGES
The app is available in Norwegian, English, Swedish and Danish. You can choose the electrical standard (NEK 400, IEC 60364, SS 436, DS/HD 60364, DIN VDE 0100, SFS 6000, BS 7671) independently of the app language.
PRIVACY
Everything runs locally on the device - no account, no server, no tracking.
IMPORTANT
Gnist is a guidance tool and does not replace independent design. All results must be checked against the current NEK 400 and manufacturer data.
Terms of Use (standard Apple EULA): https://www.apple.com/legal/internet-services/itunes/dev/stdeula/
Ratings & Reviews
- This app hasn’t received enough ratings or reviews to display an overview.
New calculator: Power loss & cost — see what cable losses cost per year, and how much a larger cross-section saves. Plus search and a recently-used shortcut on the home screen.
The developer, VEGARD HELLAND BU, indicated that the app’s privacy practices may include handling of data as described below. For more information, see the developer’s privacy policy .
Data Not Collected
The developer does not collect any data from this app.
Accessibility
The developer has not yet indicated which accessibility features this app supports. Learn More
Information
- Seller
- VEGARD HELLAND BU
- Size
- 2.5 MB
- Category
- Utilities
- Compatibility
Requires iOS 17.0 or later.
- iPhone
Requires iOS 17.0 or later. - iPad
Requires iPadOS 17.0 or later. - Mac
Requires macOS 14.0 or later and a Mac with Apple M1 chip or later. - Apple Vision
Requires visionOS 1.0 or later.
- iPhone
- Languages
English and 3 more
- English, Danish, Norwegian Bokmål, Swedish
- Age Rating
4+
- 4+
- Copyright
- © 2026 Weebu (Vegard Bu)
