Complex RPN Calculator vs Gnist

Complex RPN Calculator is a scientific RPN calculator with a four stack whose native number is complex. You can view and enter numbers in both polar and rectangular formats. Complex RPN remembers its state between usages and has 10 memory locations.

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/