OhmKit vs BenchKit

OhmKit is a resistor calculator and electronics toolkit designed for engineers, technicians, students, makers, and electronics enthusiasts. Decode resistor color codes and SMD markings, calculate circuit values, find suitable standard resistors, and organize your components and projects in one clean app. CALCULATORS • Decode 3, 4, 5, and 6-band resistor color codes • Convert resistance values into color bands • Decode and encode SMD resistor markings • Calculate series and parallel resistors • Find target resistance combinations using standard E-series values • Calculate voltage, current, resistance, and power with Ohm’s law • Design series and parallel LED circuits • Calculate voltage dividers • Calculate resistor power and recommended power ratings • Automatically convert engineering units PROJECT TOOLS • Save calculation history and favorites • Create reusable presets • Organize components into projects and bills of materials (BOM) • Export project data as PDF or CSV • Back up and restore supported local data • Copy and share calculation results • Access built-in electronics references DESIGNED FOR EVERYDAY USE • Clear circuit diagrams and standard electrical symbols • Light and dark themes • Adjustable calculator and display preferences • Interface available in 13 languages • Core calculations run locally on your device The free version contains ads. OhmKit Pro removes ads and unlocks additional workflow features. Purchases are securely processed through the App Store. Calculation results are provided as engineering aids. Always verify component ratings and manufacturer specifications before building or powering a circuit.

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.