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CLUSTER COLOR-RESISTOR-BAND · 10 ENTRIES · EARLIEST ENTRY 2021-01-31

Resistor color code calculators

This cluster consists of small utilities for electronics enthusiasts and technicians that decode resistor (and sometimes ceramic capacitor) color bands into resistance values and tolerances, with some supporting four-, five-, and six-band codes. Members include Ohms Now!, pyresistors, and Color Code, though all currently show zero stars for activity. The cluster's dated history is too thin to read a shape from – it predates the index or its members are undated, with only three dated entries prior to the index start.

Entry timeline

ENTRY TIMELINE

JAN 2021: 1JUN 2022: 1AUG 2024: 1SEP 2025: 1OCT 2025: 1AUG 2026: 2SEP 2026: 1OCT 2026: 2
JAN 2021OCT 2026

Each bar is the month a member carries, which is a creation date where the source published one and a crawl date otherwise. Nothing in the index was found before 11 August 2026, and coverage broadened sharply on 14–15 August, so a bar from then on reports how much we found that month, not how much was built; an earlier bar reports how far back a member's own source dated it — not how long we have been watching.

Members by activity

Activity signals, not revenue.

Build origin · 2 ai-built · 2 hand-coded · 6 unlabelled

Operator · 3 hobby · 1 indie · 4 open source · 2 unlabelled

Two labels per entry, never collapsed into one: how it was built, and who stands behind it. Counted over the 10 listed below. Unlabelled means nothing has decided yet — not that the answer is small.

  1. 01tro-toolbox0★2 daysliveai-builthobbyWeb app with calculators for Ohm's law, resistor color codes, and unit conversion for automation engineering students.
  2. 02SMT-Electronic-Components-Calculator0★22 dayslivehobbyElectronics calculator web app for resistor, capacitor, inductor, diode, transistor and MOSFET calculations, serving engineers, students and hobbyists.
  3. 03Ohms Now!0★4 yrabandonedlivehand-codedopen sourceSimple tool that helps electronics enthusiasts decode resistor and ceramic capacitor color bands by tapping and selecting colors.
  4. 04pyresistors0★unknownlivehobbyUtility that calculates the resistance value and tolerance of an electrical resistor from its color band code.
  5. 05Color Code0★11 mostaleliveopen sourceUtility application that converts resistor color bands into resistance values, supporting four, five, and six band codes for electronics hobbyists.
  6. 06Retherm0★1 yrabandonedliveopen sourceTool that converts RTD resistances and thermocouple voltages to temperatures using standard equations.
  7. 07ElectriXi-Electrical-Engineering-Calculator-0★1 yrabandoned—ai-builtMobile and web calculator that solves electrical engineering problems across subjects like Ohm's Law, AC circuits, and power systems for students and engineers.
  8. 08ResistorLab0★unknownliveCalculator app that converts resistor values to and from color-code bands, validates standard series and tolerances, and logs measurement data for electronics students and engineers.
  9. 09ResistorGo0★unknownliveindieHandheld calculator application that decodes and encodes resistor color bands and SMD markings for technicians, students, and electronics hobbyists.
  10. 10gResistor0★4 yrabandonedlivehand-codedopen sourceDesktop utility that converts resistor color band codes into readable resistance values as colors are selected.

Ranked by traction, highest first, and paged 20 at a time — this is a window on the cluster, never the whole of it. Ties are broken by a stable id so a product cannot appear on two pages or fall between them. Browse every cluster.