# Resistor vs My C.E.M.

The clearest difference is update cadence: My C.E.M. at fortnightly against Resistor's every 9 months. My C.E.M. also leads on iOS requirement (13.0 vs 26.0). Resistor's advantage is ratings volume (19 vs 1). On price, rating, ads and in-app purchases there is nothing between them.

Both are free to download. Neither carries in-app purchases, so what you see is what you pay.

On the App Store both sit at effectively the same score — 4.9 for Resistor against 5.0 for My C.E.M.. That said, the two scores are not equally well evidenced: Resistor has 19 ratings behind it against 1, so its average is the more settled of the two.

Resistor ships an update every 9 months, My C.E.M. fortnightly. The most recent releases landed on November 3, 2026 and October 30, 2026 respectively.

## The numbers

| Metric | Resistor | My C.E.M. |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [4.9 (19 ratings)](https://appshunter.io/ios/app/resistor-converter/id6446839759/reviews) | **[5.0 (1 ratings)](https://appshunter.io/ios/app/my-cem/id6736386815/reviews)** |
| Number of ratings | **19** | 1 |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 9 months | **Fortnightly** |
| Monetization | Free | Free |
| Size | 8 MB | 102 MB |
| Requires iOS | 26.0 | **13.0** |
| Devices | iPhone, iPad | **iPhone, iPad, iPod** |
| Age rating | 4+ | 4+ |
| Developer | [Gerhard Lentschik](https://appshunter.io/developer/629988041) | [Farid Deaibess](https://appshunter.io/developer/1771809911) |

## What reviewers say

### Resistor

[App page](https://appshunter.io/ios/app/resistor-converter/id6446839759)

Quickly calculate resistor values from color bands or SMD codes, and vice versa. This tool is ideal for electronics enthusiasts, students, and DIYers working with 4, 5, or 6-band resistors and various SMD codes. It functions offline and requires no registration.

**Highlights:** Calculate resistor values from color bands, Convert resistor values to color bands, Supports 4, 5, and 6-band resistors, Handles SMD codes (EIA-3, EIA-4, EIA-96), Works offline, No registration required

**Features:** macOS Compatibility, Vision Pro support

**In-app purchases:** none


### My C.E.M.

[App page](https://appshunter.io/ios/app/my-cem/id6736386815)

Monitor your real-time energy consumption and track your bills. Control connected power units and gain insights into your energy usage patterns and trends.

**Highlights:** Real-time energy consumption monitoring, Track paid and unpaid bills, Control connected power units, Access energy insights and trends, Monitor energy behavior

**In-app purchases:** none


## Frequently asked questions

### Is Resistor free?

Resistor is free to download, with no in-app purchases.

### Is My C.E.M. free?

My C.E.M. is free to download, with no in-app purchases.

### Which has better reviews, Resistor or My C.E.M.?

My C.E.M. is rated higher. Resistor averages 4.9 out of 5 from 19 ratings, while My C.E.M. averages 5.0 from 1 ratings.

### Do Resistor or My C.E.M. have ads?

Neither Resistor nor My C.E.M. shows ads.

### Which is updated more often, Resistor or My C.E.M.?

Resistor ships an update every 9 months, and My C.E.M. fortnightly. Most recently, Resistor was updated on November 3, 2026 and My C.E.M. on October 30, 2026.

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*Compared by [AppsHunter](https://appshunter.io/) from daily US App Store data. Review summaries are generated from verbatim App Store reviews.*