BenchKit vs EngKit

BenchKit puts four everyday electronics calculations in one focused, offline iPhone app. RESISTOR CODES Decode 3, 4, 5, and 6-band axial resistors by tapping the bands on a drawn resistor, or SMD codes (3-digit, 4-digit, EIA-96, R notation). See the tolerance range, IEC marking code, and standard E-series match, with a warning when a reading is probably reversed. PCB TRACE WIDTH Estimate minimum internal or external copper trace width from current, copper weight, and allowed temperature rise, in millimeters and mils, or the current a given width can carry. Results outside the IPC-2221 chart range are flagged as extrapolations. VOLTAGE DROP Voltage drop, voltage at the load, power lost in the wiring, and the share of supply that reaches the load. Enter the round-trip resistance, or wire gauge (AWG or mm²), length, and conductor temperature. VOLTAGE DIVIDER Ideal unloaded output voltage, divider current, per-resistor dissipation, output resistance, and what an optional load does to the output. Or enter a target voltage and get the closest E24/E96 resistor pairs with their worst-case output. Type values the way engineers write them: 4k7, 2R2, 100m, 3V3; the keyboard has keys for the letters. No account. No ads. No analytics. No network connection. English, Simplified Chinese, and Japanese. BenchKit is a quick estimation tool. Always verify production designs against component datasheets, applicable standards, simulation, and physical validation.

EngKit is a focused toolkit of engineering and math calculators, built for students, hobbyists and professionals who want fast, accurate tools without clutter. FREE MODULES • Resistor Code — decode resistance from color bands, convert between SI units • Ohm's Law — calculate voltage, current and resistance interactively • LED Resistor Calculator — find the right series resistor for any LED and supply voltage • Voltage Divider — design resistor voltage dividers for any target output • Resistor Network — equivalent resistance for series and parallel circuits • Matrix Calculator — add and multiply matrices up to 10×10 • Graphing Calculator — plot and explore math functions with pan and zoom • Unit Converter — convert between 14 categories: length, mass, temperature and more PRO MODULES (one-time unlock) • Complex Numbers — add, subtract, multiply and divide in rectangular or polar form • Capacitor Code — decode capacitance from EIA 3-digit codes and tolerance letters • Equation Solver — solve linear, quadratic and 2×2 systems of equations • Triangle Solver — solve triangles and trig functions with exact values • Root Finder — bisection, false position, Newton-Raphson and secant • Projectile Motion • Boolean Algebra No subscriptions. No ads. Pay once for Pro and keep every current and future module.