# Gnist – Electrical Calculator — Cable & circuit calculators

> Cable & circuit calculators (iPhone/iPad app by VEGARD HELLAND BU.)

- Source: https://appshunter.io/ios/app/gnist-electrical-calculator/id6782571492 (this page in markdown: same URL + `.md`)
- Developer: [VEGARD HELLAND BU](https://appshunter.io/developer/6780784892)
- Category: Utilities, Productivity
- Price: $1.99
- Age rating: 4+
- Requires: iOS 17.0 · 2 MB
- Languages: American English, Danish, Norwegian Bokmål, Swedish
- Released: 2026-06-29
- Data updated: 2026-08-16
- User reviews in markdown: https://appshunter.io/ios/app/gnist-electrical-calculator/id6782571492/reviews.md

## What is Gnist?

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/


## Version history (last 4 releases)

### 1.1.0 — 2026-08-08

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.

### 1.0.2 — 2026-07-24

Gnist is now a one-time purchase — all calculators included, no subscription.

### 1.0.1 — 2026-07-01

The app is now multilingual: 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 language. Bug fixes and improvements.

### 1.0 — 2026-06-29

No release notes.

## More apps by VEGARD HELLAND BU

- [ECAP - Elektrisk anlegg](https://appshunter.io/ios/app/ecap-elektrisk-anlegg/id6780784890)
- [HuntParty: Hunt Team & Dogs](https://appshunter.io/ios/app/huntparty-hunt-team-and-dogs/id6785318170)

All apps by VEGARD HELLAND BU: https://appshunter.io/developer/6780784892

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*Data collected daily from the US App Store and indexed by [AppsHunter](https://appshunter.io/). User reviews are verbatim App Store reviews. Ratings, prices and chart positions refresh continuously; this snapshot is from 2026-08-16.*