# Resistor vs API MeasurePro

The clearest difference is update cadence: API MeasurePro at every 3 months against Resistor's every 9 months. API MeasurePro also leads on iOS requirement (13.0 vs 26.0). On price, ads, in-app purchases and device support there is nothing between them.

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

Resistor ships an update every 9 months, API MeasurePro every 3 months. The most recent releases landed on November 14, 2026 and November 12, 2026 respectively.

## The numbers

| Metric | Resistor | API MeasurePro |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[4.9 (19 ratings)](https://appshunter.io/ios/app/resistor-converter/id6446839759/reviews)** | — |
| Number of ratings | **19** | — |
| Positive reviews | 100.0% of reviews | — |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 9 months | **Every 3 months** |
| Monetization | Free | — |
| Size | 8 MB | 20 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) | [Automated Precision Inc.](https://appshunter.io/developer/1846172575) |

## 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


### API MeasurePro

[App page](https://appshunter.io/ios/app/api-measurepro/id6754576227)

**In-app purchases:** none


## Frequently asked questions

### Is Resistor free?

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

### Is API MeasurePro free?

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

### Do Resistor or API MeasurePro have ads?

Neither Resistor nor API MeasurePro shows ads.

### Which is updated more often, Resistor or API MeasurePro?

Resistor ships an update every 9 months, and API MeasurePro every 3 months. Most recently, Resistor was updated on November 14, 2026 and API MeasurePro on November 12, 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.*