Rainbohm: Resistor Color Code

H4IT

In-app purchases

About this app

Rainbohm reads the color bands of resistors and the markings on electronic parts, with your phone camera and without white paper. When the app is not sure, you see the candidates with how likely each one is, instead of a single guess. With all the codes and calculators you need for repairs, and a parts database that works offline.

COLOR BANDS, NO WHITE PAPER
- Hold the resistor in your hand or leave it on the circuit board
- 3 to 6 bands, beige and blue resistors, including white, grey, gold and silver bands
- The app works out the reading direction by itself
- One calm answer: the app waits until several frames agree
- When in doubt, two to four candidates, each drawn with its value and likelihood
- Tap a band to correct it; the app learns from your choices, only on your phone
- Color names in text and the answer read aloud, helpful if you find colors hard to tell apart
- Also from a photo in your gallery
- A handful of loose resistors in one photo: each one gets a number and its value

READING MARKINGS
- Text recognition on the phone itself reads codes and part numbers
- SMD codes such as 103, 4R7 and 01C, electrolytic capacitors, ceramic capacitors, fuses and zener diodes
- Characters that look alike, such as 0 and O or 8 and B, give extra candidates instead of a wrong answer
- If a character is off, correct the text and see straight away what it is

A WHOLE CIRCUIT BOARD IN ONE PHOTO
- One photo, and every part the app finds gets a frame
- Zoom in and tap a frame to read the marking or the color bands
- Read small parts without a marking up close, with one tap to Part mode
- Three board scans free, unlimited in the full version

CODES AND CALCULATORS, FREE
Resistor color code, SMD resistor codes, capacitor codes, inductors, fuses, diodes and LEDs, the E series, a replacement from one or two standard values, Ohm's law and power, the series resistor for an LED, series and parallel, and unit conversion. Plus a color code practice. Type values the way you write them, such as 4k7 or R47.

PARTS DATABASE
What a part is and what it does, with a link to the manufacturer's datasheet. In the full version also the pinout, the limits, where you find it, replacements, and how to measure and replace it. Every fact is taken by hand from the manufacturer's datasheet.

DOSSIERS FOR YOUR REPAIRS
Keep track per device of the parts you found, what you measured and what is broken. Broken parts go on the shopping list by themselves, and the parts box keeps track of what you already have. Dossiers are part of the full version.

PRIVACY
Rainbohm has no internet access. Your photos stay on your phone. No account and no ads.

FREE AND FULL
Free: color bands, reading markings, all codes and calculators, what a part is and does, and three board scans. The full version adds unlimited board scans, pinouts, limits, replacements, measuring and replacing, and dossiers: by subscription per month or per year, or once for good. You can cancel a subscription at any time in Google Play.

SAFETY
Unplug a device before you open it. Large electrolytic capacitors can stay charged for a long time, even with the plug out. Never measure on parts that carry mains voltage.

What’s new

New: a whole circuit board in one photo. Every part the app finds gets a frame; tap it to read the marking or the color bands. Three board scans are free. The color band reader also reads red and orange better on real phone photos.